Liebert Stereo System TM 10098 User Manual

Large Systems  
iCOM Microprocessor  
Environmental Training and Service Manual  
TM-10098: Rev. 02/06  
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Disclaimer of Warranties and Limitations of Liabilities  
The authors and editors have taken every precaution to ensure accuracy and completeness  
in this manual. The authors and editors make no expressed or implied warranty of any  
kind with regard to the documentation in this manual. Liebert Corporation assumes no  
responsibility, and disclaims all liability for incidental or consequential damages resulting  
from the use of this information or from errors or omissions. Liebert Corporation may  
make improvements and/or changes in the product(s) described in this manual at any time.  
Information in this manual is subject to change at any time and does not represent a  
commitment on the part of Liebert Corporation.  
Liebert® and the Liebert logo are registered trademarks of Liebert Corporation.  
Emerson® and the Emerson logo are registered trademarks of Emerson Electric Co.  
Copyright © 2004 by Liebert Corporation  
All rights reserved throughout the world.  
Specifications subject to change without notice.  
Printed in the United States of America  
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Table of Contents  
Chapter 1: Temperature/ Humidity Control  
Temperature Control Types  
Intelligent Control  
6
6
6
8
Proportional Control  
8
Proportional + Integral (PI) Control  
Proportional + Integral + Derivative (PID) Control  
Temperature Control  
9
11  
11  
11  
13  
18  
18  
20  
21  
25  
25  
27  
27  
29  
31  
31  
32  
33  
35  
38  
40  
41  
48  
49  
Operations and Charts  
2 Stage Compressorized  
4 Stage Compressorized Cooling  
Dual Compressor Digital Scroll Operation  
Glycool Cooling  
Dual Source Cooling  
Staged Reheat  
Humidity Control  
Absolute (Predictive) Humidity Control  
Relative Humidity Control  
Humidifier Operation  
Autoflush Control for Infrared  
Dehumidification Operation  
1 Stage Dehumidification, Compressorized Operation  
2 Stage Dehumidification, Compressorized Operation  
Reheat During Dehumidification  
Additional Programs  
Next Maintenance Calculation  
Shared Parameters an Understanding  
Networking and Functions  
Teamwork  
Unit Lead/ Lag or Running/ Standby Fuctions  
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Chapter 2: Programming Functions  
Programming Functions  
52  
52  
53  
54  
55  
56  
56  
57  
58  
59  
60  
60  
67  
84  
90  
92  
iCOM Display Components and Functions  
iCOM Keypad Layout Descriptions  
iCOM Display Symbols/ Icons  
Programming Functions  
Status Display Screens  
Menu Screens – Icons/ Parameter Names  
User Menu Icons and Descriptions  
Service Menu Icons and Descriptions  
Advanced Menu Icons and Descriptions  
User Menu Parameters  
Service Menu Parameters  
Advanced Menu Parameters  
Event Notifications Parameters  
Event ID Number, Description and Function  
Chapter 3: iCOM Hardware Connections  
Introduction  
100  
100  
101  
102  
104  
105  
106  
107  
111  
112  
Display Boards  
Unit Control Board Switches and Jumpers  
Large Display Switches and Jumpers  
Small Display Switches and Jumpers  
Temperature/ Humidity Board Switches and Jumpers  
Unit Control Board Plug Connectors  
Fuse Board Connectors  
Temperature/ Humidity Board Connectors  
Chapter 4: General Troubleshooting Data  
Introduction  
114  
114  
115  
116  
118  
119  
Isolation  
Basic Operation of the Triac  
Basic Operation of the Opto-Isolator  
Troubleshooting the Opto-Isolator  
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121  
123  
124  
126  
143  
144  
145  
146  
147  
Unit Control Board: Opto-Isolator/ Triac Legends  
iCOM Diagnostics/ Service Mode Programs  
Basic Troubleshooting Steps  
Moisture Content Charts  
Suction Transducer Information  
Digital Scroll High Temperature Sensor Chart  
Unit Code Description  
Troubleshooting Checklist  
Glossary of Unit/ Systems Parameters  
Glossary of Terms  
156  
160  
165  
169  
170  
Computer and Network Terms  
Network Information  
How To Use The Schematics  
Electrical Schematics  
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Chapter 1  
Temperature and Humidity  
Control Programs  
This section provides details on how your Liebert iCOM control responds to the  
user programmed inputs values and room conditions. Refer to this section when  
you need specific information control operation. This section includes details on  
four (4) user selectable temperature control programs and two (2) user selectable  
and humidity control programs.  
Cooling and/ or Heating Required, in Percent (%)  
The temperature control programs for the iCOM microprocessor is based on a  
calculated percent (%) requirement for cooling and/ or heating. This percent (%)  
requirement is determined by the control type (algorithm) selected by the user.  
The four (4) user selectable temperature control programs are:  
Intelligent  
Proportional (P)  
Proportional + Integral (PI)  
Proportional + Integral + Derivative (PID)  
Temperature Control Program Types  
Intelligent Control – Factory Default Setting  
The Intelligent Control operates from a set of general rules that defines how the  
control output should be adjusted for different system conditions. The rules are  
designed to duplicate the actions that an experienced human operator would take  
if manually controlling the system.  
Basically, this is done in a three-function process that differs from earlier  
mathematically defined strict type data, hence, fuzzy logic. The on and off, true or  
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untrue type of statement is not used. The consideration now is how to set the  
input value into a membership set, qualify this membership with rules, then decide  
on the output consequence for action. It is not really that simple, but it is basically  
how it works. The process:  
Membership  
Measure value of input variables  
Map and transfer data into range of set domain  
Assign input membership into sets  
Knowledge Base/Decision Making  
Provide a data base of definitions for rules base  
Provide a rules base and define function and domain  
Simulate human decision making based on concepts and actions  
defined by implications and rules  
Consequence  
Convert defined range of knowledge to a corresponding output  
variable  
Define a non-intelligent action from a deduced intelligent action  
Just as an operator might take several things into consideration before making a  
temperature control decision, the intelligent control can be programmed to do  
likewise. For example, not only is the current temperature used in making  
temperature control decisions, but also conditions such as:  
How fast is the temperature changing?  
What direction is the temperature changing?  
What is the cooling output now?  
What was the cooling output in the past?  
How long ago was the cooling output changed?  
Other factors  
Any number of rules can be used in an intelligent control to define the controls  
operation under various operating conditions. Hence, several advantages are  
gained from this type of control over a more standard control approach that uses a  
fixed mathematical equation to define the operation of the control for all conditions  
(such as a Proportional or PID Control). You can expect Intelligent Control to be  
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more efficient and precise for most applications, but system performance based on  
room conditions is not as predictable as standard approaches that use a fixed  
equation.  
The Liebert Intelligent Control includes rules that significantly enhance the  
performance of the system, both from a standpoint of precision control and system  
reliability.  
Rules are included that:  
Cause the control to ignore very small or temporary temperature/  
humidity deviations. This eliminates unnecessary control adjustments  
that contribute to control instability.  
Help limit the frequency of control adjustments thus extending the life of  
system components that are susceptible to mechanical wear or cycling.  
Recognize undesired modes of control operation such as hunting, and  
make adjustments to the control response to eliminate them.  
Estimate the present load on the system and then tend to force the  
control output to the appropriate state.  
Recognizes conditions, which indicate a large load change and allows  
the control to temporarily respond more quickly than normal.  
Cause the control to anticipate the need for reheat during  
dehumidification and activates reheats when overcooling occurs.  
Proportional (P) Control  
The proportional control is the standard control method that maintains the room at  
a temperature proportional to the load. The temperature maintained increases as  
the room load increases. At full load the room would be controlled at a  
temperature equal to the temperature set point (TSP) plus ½ of the temperature  
proportional band (PB). The operator programmed inputs are the temperature set  
point (TSP) and temperature proportional band (PB) adjustments. The operator  
may also program a temperature dead band (DB) adjustment.  
Proportional + Integral (PI) Control  
The PI control combines two (2) individual terms to determine the control output  
for a given set of conditions. Note that PI control is used only for temperature. If  
PI control is selected, the humidity control will be in percent relative humidity  
(%RH).  
The proportional (P) term is determined by the difference between the current  
temperature and the control set point. This term is expressed in % cooling  
(heating desired for each degree above (below) the set point. It is adjustable from  
0% to 100% per degree. The purpose of this term is to adjust the control output  
for any deviation between the current temperature and the control set point.  
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The integral (I) term is determined by two things: the difference between the return  
air temperature and control set point and the amount of time this difference has  
existed. This term is expressed in % cooling (heating) desired for each minute  
and degree above (below) the set point. It is adjustable from 0% - 100% per  
degree/minute. The purpose of this term is to force the control to maintain the  
temperature around the set point by slowly but continuously adding (subtracting) a  
small amount of cooling (heating) to the total control output until the temperature is  
at the set point.  
Proportional + Integral + Derivative (PID) Control  
The PID control combines three (3) individual terms to determine the control  
output for a given set of conditions. Note that PID control is used only for  
temperature. If PID control is selected, the humidity control will be in percent  
relative humidity (%RH).  
The proportional (P) term is determined by the difference between the current  
temperature and the control set point. This term is expressed in % cooling  
(heating desired for each degree above (below) the set point. It is adjustable from  
0% to 100% per degree. The purpose of this term is to adjust the control output  
for any deviation between the current temperature and the control set point.  
The integral (I) term is determined by two things: the difference between the return  
air temperature and control set point and the amount of time this difference has  
existed. This term is expressed in % cooling (heating) desired for each minute  
and degree above (below) the set point. It is adjustable from 0% - 100% per  
degree/minute. The purpose of this term is to force the control to maintain the  
temperature around the set point by slowly but continuously adding (subtracting) a  
small amount of cooling (heating) to the total control output until the temperature is  
at the set point.  
The derivative (D) term is determined by the rate of change of temperature. This  
term is expressed in % cooling (heating) desired for each degree per minute rise  
(fall) in temperature. It is adjustable from 0% to 100% per degree/minute. The  
purpose of this term is to adjust the control output for quickly changing  
temperatures, thus providing an anticipation control.  
All three terms are adjusted by selecting the “Setpoints” icon in either the USER or  
SERVICE Menu screen. If PID control is selected, the temperature proportional  
band value (and optional temperature dead band value) is not used by the control.  
For optimum performance, a PID control must be adjusted or tuned according to  
the characteristics of the particular space and load to be controlled. Improper  
tuning can cause the control to exhibit poor response and/ or hunting. The  
characteristics of the space and load may change seasonally, so occasional  
returning is required for optimum performance.  
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A suggested tuning procedure is as follows:  
1. Initially adjust the integral and derivative settings to 0% / degree-min  
and 0% / degree / min..  
2. Starting with 20% / degree, adjust the proportional setting in small  
increments (10% steps) until the control sustains a constant hunting  
action (the temperature swings are approximately the same amplitude  
from one peak to the next).  
3. Note the time in minutes between peaks of adjacent temperature  
swings and the amplitude of the temperature swing (degrees above the  
set point).  
4. Adjust the proportional control setting to about l/2 the value obtained in  
Step 2.  
5. Adjust the integral setting to a value calculated by the following  
equation: approximate room load (in % full load) time between  
peaks x peak amplitude x 4.  
Note: If calculation results in a value of less than 1%, then set the  
integral to 1%.  
6. Adjust the derivative to a value calculated by the following equation:  
time between peaks x 5%.  
The above tuning procedure is only an approximation for an initial set of  
adjustments and are based on the "average" room characteristics. Your particular  
settings may need to be further adjusted for optimum PID control performance.  
Some suggestions for additional tuning are as follows:  
If cooling output overshoot is occurring on load changes, decrease  
the proportional setting or the derivative setting.  
If system hunting occurs with constant room load, decrease the  
integral setting.  
If the control responds too slowly, resulting in large temperature  
excursions on a load change, increase the proportional setting or  
the derivative setting.  
If a constant temperature deviation exists between the  
temperature and set point, increase the integral setting.  
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Temperature Control  
Operations and Charts  
The temperature proportional control band value is divided into two parts: the  
temperature set point plus ½ of the temperature proportional band for cooling  
operation and the temperature set point minus ½ of the temperature proportional  
band for heating operation. A temperature dead band can also be programmed  
into the control to shift the cooling and/ or heating on/ off operations away from the  
temperature set point.  
This programmed temperature dead band value is divided into two parts: the  
temperature set point plus ½ of the dead band – no cooling operation and the  
temperature set point minus ½ of the band – no heating operation.  
The temperature set point range is adjustable from 41 - 104°F in increments of  
1°F. The temperature proportional band range is adjustable from 2 - 54°F in  
increments of 1°F. The temperature dead band range is adjustable from 0 - 36°F  
in increments of 1°F.  
Standard 2 Stage Compressorized Cooling  
The basic temperature cooling control band is established at the temperature set  
point with the length equal to ½ of the programmed temperature proportional band  
divided by the number of cooling stages.  
The Liebert DS units are supplied with two (2) compressors, each compressor is  
rated at ½ of the unit capacity. The two (2) compressors will be either the  
semi-hermetic or scroll type and will operate in an on/ off configuration to cool the  
space.  
The temperature controller activates the first cooling stage (lead compressor)  
when the return air temperature increases to 50% of the cooling proportional band  
and the second cooling stage (lag compressor) at 100% of the cooling proportional  
band. The optional hot gas bypass solenoid valve, supplied with each compressor  
when ordered, is also energized on a call for cooling.  
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The temperature controller deactivates the second stage of cooling (lag  
compressor) when the return air temperature decreases to 50% of the cooling  
proportional control band value. The first cooling stage (lead compressor) is  
deactivated when the return air temperature decreases to the temperature set  
point value or 0% of the cooling proportional control band value.  
2 Stage Compressorized Cooling – No Dead Band  
Temp Set Point + (1/2 Proportional Band)  
Temp Set Point: 70°F  
Proportional Band: 8°F  
Cool 2 On  
Cool 1 On  
70  
71  
72  
73  
74  
75  
Cool 1 Off  
Cool 2 Off  
Increasing Temperature  
Note: in the above example that the control band begins at the 70°F temperature  
set point and has a length of 4°F, which is ½ of the programmed temperature  
proportional band value.  
As the return air temperature increases Cooling 1 (lead compressor) is activated at  
72°F or 50% of the cooling control band. If the return air temperature continues to  
increase Cooling 2 (lag compressor) will activate at 74°F or 100% of the cooling  
control band.  
When the return air temperature starts to decrease, Cooling 2 (lag compressor) is  
deactivated at 72°F or 50% of the cooling control band and Cooling 1 (lead  
compressor) is deactivated at the temperature set point of 70°F or 0% of the  
cooling control band.  
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2 Stage Compressorized Cooling – With Dead Band  
Temp Set Point + (1/2 Dead Band + 1/2 Proportional Band)  
Temp Set Point: 70°F  
Proportional Band: 8°F  
Dead Band: 2°F  
Cool 2 On  
Cool 1 On  
70  
71  
72  
73  
74  
75  
DB  
Cool 2 Off  
Increasing Temperature  
Cool 1 Off  
Note: in the above example that the control band begins at the 70°F temperature  
set point and has a length of 5°F, which is ½ of the programmed temperature dead  
band value plus ½ of the programmed temperature proportional band value.  
As the return air temperature increases Cooling 1 (lead compressor) is activated at  
73°F or ½ of the dead band value plus 50% of the cooling control band. If the  
return air temperature continues to increase Cooling 2 (lag compressor) will  
activate at 75°F or ½ of the dead band value plus 100% of the cooling control  
band.  
When the return air temperature starts to decrease, Cooling 2 (lag compressor) is  
deactivated at 73°F or ½ of the dead band value plus 50% of the cooling control  
band and Cooling 1 (lead compressor) is deactivated at 71°F or ½ of the dead  
band value plus 0% of the cooling control band.  
Remember the temperature dead band value is used by the control to shift the  
cooling on/ off operations away from the temperature set point.  
Optional 4 - Stage Cooling, Two (2) Compressors with Unloaders  
The basic temperature cooling control band is established at the temperature set  
point with the length equal to ½ of the programmed temperature proportional band  
divided by the number of cooling stages.  
The Liebert DS units are supplied with two (2) compressors, each compressor is  
rated at ½ of the unit capacity. Each compressor will be the semi-hermetic type  
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and will be supplied with an electrical cylinder unloader valve. The electrical  
solenoid valve used to unload or reduce the cooling capacity of the compressor.  
The compressors will operate in an on/ off - loaded/ unloaded configuration  
method to cool the space. The hot gas bypass solenoid valve option is not  
available on 4 stage systems.  
The temperature controller activates the first cooling stage, lead compressor  
unloaded, when the return air temperature increases to 25% of the cooling  
proportional band. The second cooling stage, lag compressor unloaded, is  
activated when the return air temperature increases to 50% of the cooling  
proportional band.  
The temperature controller activates the third cooling stage, the lead compressor  
loaded, when the return air temperature increases to 75% of the cooling  
proportional band. The fourth cooling stage, the lag compressor loaded, is  
activated when the return air temperature increases to 100% of the cooling  
proportional band.  
The temperature controller deactivates the fourth cooling stage, lag compressor  
loaded, when the return air temperature decreases to 75% of the cooling  
proportional control band value. The third cooling stage, lead compressor loaded,  
is deactivated when the return air temperature decreases to 50% of the cooling  
proportional control band value.  
The temperature controller deactivates the second cooling stage, lag compressor  
unloaded, when the return air temperature decreases to 25% of the cooling  
proportional control band value. The first cooling stage, lead compressor  
unloaded, is deactivated when the return air temperature decreases to the  
temperature set point value or 0% of the cooling proportional control band value.  
The table below shows the devices activated by each of the four cooling stages.  
STAGE COMPRESSORS, UNLOADER STATE  
Compressor 1 On, Unloader On (Energized)  
Compressor 2 Off, Unloader Off (De-Energized)  
1
Compressor 1 On, Unloader On (Energized)  
Compressor 2 Off, Unloader On (Energized)  
2
Compressor 1 On, Unloader Off (De-Energized)  
Compressor 2 On, Unloader On (Energized)  
3
Compressor 1 On, Unloader Off (De-Energized)  
Compressor 2 On, Unloader Off (De-Energized)  
4
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4 Stage Compressorized Cooling – No Dead Band  
Temp Set Point + (1/2 Proportional Band)  
Temp Set Point: 70°F  
Proportional Band: 8°F  
Cool 4 On  
Cool 2 On  
Cool 3 On  
Cool 1 On  
70  
71  
72  
73  
74  
75  
Cool 2 Off  
Cool 4 Off  
Cool 1 Off  
Cool 3 Off  
Increasing Temperature  
Note: in the above example that the control band begins at the 70°F temperature  
set point and has a length of 4°F, which is ½ of the programmed temperature  
proportional band value.  
As the return air temperature increases Cooling 1, the lead compressor unloaded,  
is activated at 71°F or 25% of the cooling control band. If the return air  
temperature continues to increase Cooling 2, the lag compressor unloaded is  
activated at 72°F or 50% of the cooling control band. If the return air temperature  
continues to increase Cooling 3, the lead compressor is loaded at 73°F or 75% of  
the cooling control band. If the return air temperature continues to increase  
Cooling 4, the lag compressor is loaded at 74°F or 100% of the cooling control  
band.  
When the return air temperature starts to decrease, Cooling 4 is deactivated at  
73°F or 75% of the cooling control band. If the return air temperature continues to  
decrease Cooling 3 is deactivate at 72°F or 50% of the cooling control band. If the  
return air temperature continues to decrease Cooling 2 is deactivate at 71°F or  
25% of the cooling control band and Cooling 1 is deactivated at the temperature  
set point of 70°F or 0% of the cooling control band.  
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The example below is based on a temperature set point of 70°F with a control  
band length of 4°F, which is ½ of the programmed temperature proportional band  
value.  
STAGE  
TEMPERATURE  
Cool 1 ON  
Cool 2 ON  
Cool 3 ON  
Cool 4 ON  
Cool 4 OFF  
Cool 3 OFF  
Cool 2 OFF  
Cool 1 OFF  
Set point plus 1°F  
Set point plus 2°F  
Set point plus 3°F  
Set point plus 4°F  
Set point plus 3°F  
Set point plus 2°F  
Set point plus 1°F  
Set point  
4 Stage Compressorized Cooling – With Dead Band  
Temp Set Point + (1/2 Dead Band + 1/2 Proportional Band)  
Temp Set Point: 70°F  
Proportional Band: 8°F  
Dead Band: 2°F  
Cool 4 On  
Cool 3 On  
Cool 2 On  
Cool 1 On  
70  
71  
72  
73  
74  
75  
DB  
Cool 4 Off  
Cool 2 Off  
Cool 3 Off  
Increasing Temperature  
Cool 1 Off  
Note: in the above example that the control band begins at the 70°F temperature  
set point and has a length of 5°F, which is ½ of the programmed temperature dead  
band value plus ½ of the programmed temperature proportional band value.  
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As the return air temperature increases Cooling 1, lead compressor unloaded, is  
activated at 72°F or ½ of the dead band value plus 25% of the cooling control  
band. If the return air temperature continues to increase Cooling 2, lag  
compressor unloaded, will activate at 73°F or ½ of the dead band value plus 50%  
of the cooling control band. If the return air temperature continues to increase  
Cooling 3, lead compressor unloaded, is activated at 74°F or ½ of the dead band  
value plus 75% of the cooling control band. If the return air temperature continues  
to increase Cooling 4, lag compressor loaded, will activate at 75°F or ½ of the  
dead band value plus 100% of the cooling control band.  
When the return air temperature starts to decrease, Cooling 4 is deactivated at  
74°F or ½ of the dead band value plus 75% of the cooling control band. If the  
return air temperature continues to decrease Cooling 3 will be deactivate at 73°F  
or ½ of the dead band value plus 50% of the cooling control band. If the return air  
temperature continues to decrease Cooling 2 will be deactivate at 72°F or ½ of the  
dead band value plus 25% of the cooling control band and Cooling 1 is  
deactivated at 71°F or 1/2 the dead band value plus 0% of the cooling control  
band.  
Remember the temperature dead band value is used by the control to shift the  
cooling on/ off operations away from the temperature set point.  
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Optional Dual Compressor Digital Scroll Operation  
100  
Switch 2nd  
1 compressor operation  
compressor ON  
70  
50  
PWM  
2 compressor operation  
Switch 1st compressor ON  
35  
20  
Off  
On  
C2  
C1  
Off  
Start/ stop  
On  
35  
0%  
10  
70  
20 25  
In the chart above we are defining the Digital Compressor start and stop at the  
capacity need and how the compressors load and unload with the PWM from the  
controller and the unit setting for temperature control.  
Note that the Digital Scroll will run continuously while the head is raised and  
lowered as the need for cooling is required from 10% to 100% and vise versa.  
Optional Glycool (Econ-O-Cycle) Cooling  
When supplied with the Glycool option, the basic unit is supplied with an additional  
coil, piping, valve and a Glycol Fluid Sensor (AQ), which is mounted to the unit  
supply fluid line and serves as control interface in determining the system  
operation. Selection of the glycool or compressorized operation is controlled by  
microprocessor using this aquastat to sense the glycol temperature.  
The Glycool (Econ-O-Cycle) Cooling program establishes two distinct control  
bands for cooling control operation. The first band controls the operation of the  
chilled glycol valve and the second controls the operation of the compressors,  
either 2-stage or 4-stage.  
The microprocessor checks the return air temperature and the entering glycol fluid  
temperature to determine a cooling capacity. In order to reduce compressor  
cycling and to prevent chilled glycol valve hunting, Glycool (Econ-o-Cycle) cooling  
capacity does not become available until the entering chilled glycol fluid  
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temperature is at least 8°F below the return air temperature, or 3°F lower than the  
return air temperature for two consecutive hours.  
When the microprocessor decides that the return glycol fluid temperature is cold  
enough the first cooling band is the modulating valve control method, and the  
second band, added to the first band, is for the compressors as in the normal  
2-Stage or 4-Stage control method. If the chilled glycol fluid temperature is not  
cold enough the valve control band is replaced by the compressor band. If the  
chilled glycol cooling capacity is reduced by a rise in the glycol fluid temperature,  
the control band shrinks proportionally. This allows the compressor band to move  
down as well. The following shows the Glycool operation at 100% capacity and  
the Glycool at 50% capacity.  
Glycool at 100% Capacity – No Dead Band  
Temp Set Point + (1/2 Proportional Band + 1/2 Proportional Band)  
Temp Set Point: 70°  
Proportional Band: 8°  
100%  
Open  
Cool 2 On  
Cool 1 On  
Valve  
Closed  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
Band 1 Glycool Valve  
Band 2 Compressors  
Increasing Temperature  
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Glycool at 50% Capacity – No Dead Band  
Temp Set Point + (1/2 Proportional Band + 1/2 Proportional Band)  
Temp Set Point: 70°  
Proportional Band: 8°  
100%  
Open  
Cool 2 On  
Cool 1 On  
Valve  
Closed  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
Band 1  
Glycool  
Valve  
Band 2 Compressors  
Increasing Temperature  
Dual Source Cooling  
When supplied with the Dual Cooling option, the basic unit is supplied with an  
additional coil, piping, valve and a Glycol Fluid Sensor (AQ), which is mounted to  
the unit supply fluid line and serves as control interface in determining the system  
operation. Selection of the chilled water or compressorized operation is controlled  
by microprocessor using this aquastat to sense the water temperature.  
The Dual Source Cooling program establishes two distinct control bands for  
cooling control operation in the same method as Glycool. The first band controls  
the operation of the chilled water valve and the second controls the operation of  
the compressors, either 2-stage or 4-stage.  
The microprocessor checks the return air temperature and the entering chilled  
water fluid temperature to determine a cooling capacity. The chilled water cooling  
capacity is considered to be 100% if the entering Chilled Water fluid temperature is  
8°F lower than the return air temperature.  
When the microprocessor decides that the return chilled water temperature is cold  
enough the first cooling band is the modulating valve control method, and the  
second band, added to the first band, is for the compressors as in the normal  
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2-Stage or 4-Stage control method. If the chilled water temperature is not cold  
enough the valve control band is replaced by the compressor band.  
Dual Cooling at 100% Capacity – No Dead Band  
Temp Set Point + (1/2 Proportional Band + 1/2 Proportional Band)  
Temp Set Point: 70°  
Proportional Band: 8°  
100%  
Open  
Cool 2 On  
Cool 1 On  
Valve  
Closed  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
Band 1 Chilled Water  
Valvel  
Band 2 Compressors  
Increasing Temperature  
An addition program available with the Dual Cooling option is called Minimum  
Chilled Water Temperature. This program allows the end user to select the  
minimum chilled water temperature that permits simultaneous operation of the  
chilled water control and compressor control. When the supply chilled water  
temperature decreases to this programmed value ONLY the chilled water valve  
control is operational, the compressors are locked out.  
Staged Electric Reheat  
The basic temperature heating control band is established at the temperature set  
point with the length equal to ½ of the programmed temperature proportional band  
divided by the number of reheat stages.  
The Liebert DS units are supplied with three (3) reheat stages (elements), each  
stage is rated at 1/3 of the unit capacity. The three (3) stages will operate in an  
on/ off configuration to reheat the unit discharge air as it enters the space.  
The temperature controller activates the first electric heating stage when the return  
air temperature decreases to 33% of the heating proportional band. The second  
electric heating stage activates when the return air temperature decreases to 66%  
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of the heating proportional band. The third electric heating stage activates when  
the return air temperature decreases to 100% of the heating proportional band.  
The temperature controller deactivates the third heating stage when the return air  
temperature increases to 66% of the heating proportional control band value. The  
second heating is deactivated when the return air temperature increases to 33% of  
the heating proportional control band value. The first heating stage is deactivated  
when the return air temperature increases to the temperature set point value or  
0% of the heating proportional control band value.  
3 Stage Electric Reheat – No Dead Band  
Temp Set Point - (1/2 Proportional Band)  
Temp Set Point: 70°F  
Proportional Band: 8°F  
Reheat 1 On  
Reheat 2 On  
Reheat 3 On  
65  
66  
67  
68  
69  
70  
Reheat  
2 Off  
Reheat  
1 Off  
Reheat  
3 Off  
Decreasing Temperature  
Note: in the above example that the control band begins at the 70°F temperature  
set point and has a length of 4°F, which is ½ of the programmed temperature  
proportional band value.  
As the return air temperature decreases Reheat 1 is activated at 68.7°F or 33% of  
the heating control band. If the return air temperature continues to decrease  
Reheat 2 will activate at 67.4°F or 66% of the heating control band. If the return  
air temperature continues to decrease Reheat 3 will activate at 66°F or 100% of  
the heating control band.  
When the return air temperature starts to increase, Reheat 3 is deactivated at  
67.4°F or 66% of the heating control band, Reheat 2 is deactivated at 68.7°F or  
33% of the heating control band and Reheat 1 is deactivated at the temperature  
set point of 70°F or 0% of the heating control band.  
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3 Stage Electric Reheat – With Dead Band  
Temp Set Point - (1/2 Dead Band + 1/2 Proportional Band)  
Temp Set Point: 70°F  
Proportional Band: 8°F  
Reheat 1 On  
Dead Band: 2°F  
Reheat 2 On  
Reheat 3 On  
65  
66  
67  
68  
69  
70  
DB  
Reheat  
2 Off  
Reheat  
3 Off  
Reheat  
1 Off  
Decreasing Temperature  
Note: in the above example that the control band begins at the 70°F temperature  
set point and has a length of 5°F, which is ½ of the programmed temperature dead  
band value plus ½ of the programmed temperature proportional band value.  
As the return air temperature decreases Reheat 1 is activated at 67.7°F or ½ of  
the dead band value plus 33% of the heating control band. If the return air  
temperature continues to decrease Reheat 2 will activate at 66.4°F or ½ of the  
dead band value plus 66% of the heating control band. If the return air  
temperature continues to decrease Reheat 3 will activate at 65°F or ½ of the dead  
band value plus 100% of the heating control band.  
When the return air temperature starts to increase, Reheat 3 is deactivated at  
66.4°F or ½ of the dead band value plus 66% of the heating control band. Reheat  
2 is deactivated at 67.7°F or ½ of the dead band value plus 33% of the heating  
control band. Reheat 1 is deactivated at 69°F or ½ of the dead band value plus  
0% of the heating control band.  
Remember the temperature dead band value is used by the control to shift the  
cooling on/ off operations away from the temperature set point.  
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Humidity Control  
Humidification and/ or Dehumidification Required, in  
Percent (%)  
The humidity control programs for the iCOM microprocessor is based on a  
calculated percent (%RH) requirement for humidification and/ or dehumidification.  
This percent (%RH) requirement is determined by the control type (algorithm)  
selected by the user.  
The two (2) user selectable humidity control programs are:  
Absolute Humidity, grains of moisture in the air  
Relative Humidity (%RH)  
Humidity Control Program Types  
Absolute (predictive) Humidity Control – Factory Default Setting  
Absolute (predictive) humidity control is based on the moisture content in the  
return air. The iCOM microprocessor control automatically adjusts the humidity  
control as the return air temperature deviates from the programmed temperature  
set point. This calculation converts the return temperature and humidity values to  
a moisture content value defined as either grains per cubic foot or grains per  
pound. This recalculated content value is compared to the content control band  
that is determined by the:  
Programmed temperature set point  
Programmed humidity set point in %RH  
Programmed humidity proportional band in %RH  
This automatic adjustment results in a predictive humidity control response. With  
absolute humidity control, the humidity control program is automatically adjusted  
approximately 2% RH for each degree difference between the return air  
temperature and the temperature set point. Note the following example:  
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Humidity  
Temperature Humidity  
Content Level  
Proportional  
Grains per LB.  
Band = 6%  
Set Point  
Set Point  
50%  
50%  
+3%  
-3%  
59.2  
52.5  
75°F  
75°F  
The Absolute (Predictive) Humidity Control Flowchart shows what the program is  
doing and why.  
Programmed Values  
Temp Set Point  
Humidity Set Point  
Calculates Band  
Compares  
Moisture  
Content to  
Band and  
Makes  
Humidity Proportional Band  
Calculates Content  
Present  
Room Temperature  
Room Humidity  
Decision  
Humidify  
Dehumidify  
The program can be analyzed using the Moisture Content Charts supplied in a  
later chapter of this manual. It is important to remember that the display provides  
the humidity value in %RH, not moisture content. The moisture content (grains)  
values are used only in the internal control program calculation. The LCD display  
will indicate relative humidity percentage for both methods of control. If the  
absolute method of control is selected, the adjusted humidity reading will be  
shown.  
When utilizing the absolute (predictive) humidity control program feature,  
the humidity level is automatically adjusted ~ 2% RH for each degree  
difference between the return air temperature and the temperature set point.  
When absolute humidity control is used, over dehumidification is avoided in the  
space. When overcooling occurs, causing an increase in the relative humidity  
reading, the humidity control program “predicts” what the RH will be when the  
dehumidification cycle ends and the temperature returns to the programmed set  
point. This allows the dehumidification cycle to end at the proper time.  
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Relative Humidity Control  
Relative humidity control is based on the humidity content in the return air. The  
iCOM microprocessor control determines the unit humidification/ dehumidification  
operation by comparing the return air humidity value to the control band that is  
determined by the:  
Programmed humidity set point in %RH  
Programmed humidity proportional band in %RH  
Operations and Charts  
The humidity proportional control band value is divided into two parts: the humidity  
set point plus ½ of the programmed humidity proportional band for  
dehumidification operation and the humidity set point minus ½ of the programmed  
humidity proportional band for humidification operation.  
A humidity dead band can also be programmed into the control to shift the  
humidification and/ or dehumidification on/ off operations away from the humidity  
set point.  
This programmed humidity dead band value is divided into two parts: the humidity  
set point plus ½ of the dead band – no dehumidification operation and the humidity  
set point minus ½ of the band – no humidification operation.  
The humidity set point range is adjustable from 1 – 80% RH in increments of 1%  
RH. The humidity proportional band range is adjustable from 1 – 20% RH in  
increments of 1% RH. The humidity dead band range is adjustable from  
0 – 50% RH in increments of 1% RH.  
Humidifier Operation  
The Relative Humidity control program is used to illustrate the humidification  
operation in the following examples. The basic humidification control band is  
established at the humidity set point with the length equal to ½ of the programmed  
humidity proportional band value. The Liebert DS units are supplied with an  
infrared humidifier rated at the unit capacity.  
The humidity controller activates the infrared humidifier when the return air  
humidity level decreases to 100% of the humidity proportional band. The  
humidifier makeup water solenoid valve also operates during humidification  
operation based on a timing sequence.  
The humidity controller deactivates the infrared humidifier and makeup water  
solenoid valve when the return air humidity level increases to 50% of the humidity  
proportional control band value.  
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Infrared Humidification – No Dead Band  
Humidity Set Point - (1/2 Proportional Band)  
Humid Set Point: 50%  
Proportional Band: 8%  
Humidification On  
45  
46  
47  
48  
49  
50  
Humidification Off  
Decreasing Humidity  
Note: in the above example that the control band begins at the 50% humidity set  
point and has a length of 4%, which is ½ of the programmed humidity proportional  
band value.  
As the return air humidity decreases the infrared humidifier is activated at 46%RH  
or 100% of the humidification control band. When the return air humidity starts to  
increase, the infrared humidifier is deactivated at 48%RH or 50% of the  
humidification control band.  
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Infrared Humidification – With Dead Band  
Humidity Set Point - (1/2 Dead Band + 1/2 Proportional Band)  
Humid Set Point: 50%  
Proportional Band: 8%  
Dead Band: 2%  
Humidification On  
45  
46  
47  
48  
49  
50  
DB  
Humidification Off  
Increasing Temperature  
Note: in the above example that the control band begins at the 50% humidity set  
point and has a length of 5%, which is ½ of the programmed dead band value plus  
½ of the programmed humidity proportional band value.  
As the return air humidity decreases the infrared humidifier is activated at 45%RH  
or ½ of the dead band value plus 100% of the humidification control band. When  
the return air humidity starts to increase, the infrared humidifier is deactivated at  
47%RH or ½ of the dead band value plus 50% of the humidification control band.  
Autoflush Control for Infrared Large (IFL) or Small (IFS)  
Pans  
The Autoflush Water-Level Control software program is an integral part of the  
infrared humidifier system. The program automatically controls a water makeup  
valve to maintain the proper water level in the humidifier pan during operation.  
When a call for humidification exists, the program performs a series of checks.  
The first check to see how long the infrared humidifier has been off. If the off time  
is equal to or greater than the programmed value (factory default is 15 hours), it is  
assumed that the pan is dry and a program called pre-fill is initiated to add water to  
the pan. During the pre-fill operation the infrared lamps are inactive. The pre-fill  
time is programmable with an adjustable range of 1 to 120 seconds for either pan  
size. The factory default for a large (IFL) pan is 60 seconds and for a small (IFS)  
pan is 30 seconds.  
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If the off time is less than 15 hours (or user programmed value) the pre-fill program  
is bypassed and the infrared lamps and water valve are activated at the same time  
to fill the pan to the proper water level and initiate humidification.  
During normal infrared humidification operation the water makeup valve is  
periodically closed (no pan fill) and opened (pan fill) based on a timing sequence  
to allow for the evaporation of water from the pan (see flow chart below).  
With the humidifier water flush rate set at the factory default value of 150% the  
water makeup valve will open for 7 minutes of fill time with an off time of 45  
seconds between fill cycles for a small pan. For a large pan water makeup valve  
will open for 10 minutes of fill time with an off time of 80 seconds between fill  
cycles. The user can modify the percentage from 110% to a maximum of 500% in  
1% increments.  
Autoflush Control Flow Chart  
Call for  
Humidification  
On in last  
15 Hours?  
HMV Pre-fill  
30 sec – small pan  
60 sec – large pan  
NO  
YES  
HMV and Lamps on  
4 min – small pan  
7 min – large pan  
Refill  
110% to 500%  
Humidification  
Lamps only  
8 min – small pan  
10 min – large pan  
Notes:  
1. IFL: Infra-red Large and IFS: Infra-red Small  
2. Last 15 Hours is programmable from 1-120hours.  
3. Pre-fill time is programmable from 1-120 seconds on Large or Small pans  
4. Normal Fill is programmable from 1-120 seconds  
5. Refill is programmable in 1% increments  
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Dehumidification Operation  
The Relative Humidity control program is used to illustrate the dehumidification  
operation in the following examples. The basic dehumidification control band is  
established at the humidity set point with the length equal to ½ of the programmed  
humidity proportional band value.  
The humidity controller activates dehumidification operation when the return air  
humidity level increases to 100% of the humidity proportional band. The humidity  
controller deactivates dehumidification operation when the return air humidity level  
decreases to 0% of the humidity proportional control band value.  
1-Stage Dehumidification, Compressorized Direct Expansion (DX)  
Systems  
The Liebert DS unit is supplied with two (2) compressors. Under normal  
operation, the lead compressor is used for sensible cooling and the lag  
compressor is used for either additional cooling or for dehumidification control.  
The optional hot gas bypass solenoid valve is de-energized during  
dehumidification.  
If single compressor dehumidification is selected, the lag compressor is activated  
by the humidity controller when the return air humidity level increases to 100% of  
the humidity proportional band.  
The humidity controller deactivates the lag compressor when the return air  
humidity level decreases to 50% of the humidity proportional control band value.  
1 Stage Compressorized Dehumidification – No Dead Band  
Humidity Set Point - (1/2 Proportional Band)  
Humid Set Point: 50%  
Proportional Band: 8%  
Dehumidification On  
50  
51  
52  
53  
54  
55  
Dehumidification Off  
Increasing Humidity  
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Note: in the above example that the control band begins at the 50% humidity set  
point and has a length of 4%, which is ½ of the programmed humidity proportional  
band value.  
As the return air humidity increases, dehumidification operation is activated at  
54%RH or 100% of the dehumidification control band. When the return air  
humidity starts to decrease, dehumidification operation is deactivated at 52%RH or  
50% of the humidity proportional control band.  
1 Stage Compressorized Dehumidification – With Dead Band  
Humidity Set Point - (1/2 Dead Band +1/2 Proportional Band)  
Humid Set Point: 50%  
Proportional Band: 8%  
Dead Band: 2%  
Dehumidification On  
50  
51  
52  
53  
54  
55  
DB  
Dehumidification Off  
Increasing Humidity  
Note: in the above example that the control band begins at the 50% humidity set  
point and has a length of 5%, which is ½ of the programmed dead band value plus  
½ of the programmed proportional band value.  
As the return air humidity increases, dehumidification operation is activated at 55%  
RH or ½ of the dead band value plus 100% of the dehumidification control band.  
When the return air humidity starts to decrease, dehumidification operation is  
deactivated at 53%RH or ½ of the dead band value plus 50% of the humidity  
proportional control band.  
2-Stage Dehumidification, Compressorized Direct Expansion (DX)  
Systems  
The basic dehumidification control band is established at the humidity set point  
with the length equal to ½ of the programmed humidity proportional band value.  
When 2 stage dehumidification is selected, the controller works as follows.  
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The humidity controller activates the first stage of dehumidification operation when  
the return air humidity level increases to 50% of the humidity proportional band.  
The second stage of dehumidification is activated when the return air humidity  
level increases to 100% of the humidity proportional band.  
The humidity controller deactivates the second stage of dehumidification operation  
when the return air humidity level decreases to 50% of the humidity proportional  
control band value. The first stage of dehumidification is deactivated when the  
return air humidity level decreases to the humidity set point of 50% or 0% of the  
humidity proportional band.  
If the compressors have unloading capability (4-stage cooling), then the  
compressors are activated in the fully loaded condition for each stage of  
dehumidification.  
2 Stage Compressorized Dehumidification – No Dead Band  
Humidity Set Point + (1/2 Proportional Band)  
Humid Set Point: 50%  
Proportional Band: 8%  
Dehumid  
Stage 2 On  
Dehumid  
Stage 1 On  
50  
51  
52  
53  
54  
55  
Dehumid  
Dehumid  
Stage 1 Off  
Stage 2 Off  
Increasing Humidity  
Note: in the above example that the control band begins at the 50% humidity set  
point and has a length of 4%, which is ½ of the programmed humidity proportional  
band value.  
As the return air humidity level increases, first stage dehumidification operation is  
activated at 52%RH or 50% of the dehumidification control band. If the return air  
humidity level continues to increase the second dehumidification stage actives at  
54%RH, which 100% of the dehumidification control band.  
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When the return air humidity level decreases to 52%RH or 50% of the  
dehumidification control band the second dehumidification stage is deactivated.  
When the return air humidity level decreases to the humidity set point of 50% or  
0% of the humidity proportional band the first dehumidification stage is  
deactivated.  
2 Stage Compressorized Dehumidification – With Dead Band  
Humidity Set Point + (1/2 Dead Band +1/2 Proportional Band)  
Humid Set Point: 50%  
Proportional Band: 8%  
Dead Band: 2%  
Dehumid  
Stage 2 On  
Dehumid  
Stage 1 On  
50  
51  
52  
53  
54  
55  
DB  
Dehumid  
Stage 2 Off  
Dehumid  
Stage 1 Off  
Increasing Humidity  
Note: in the above example that the control band begins at the 50% humidity set  
point and has a length of 5%, which is ½ of the programmed dead band value plus  
½ of the programmed humidity proportional band value.  
As the return air humidity level increases, first stage dehumidification operation is  
activated at 53%RH or ½ of the programmed dead band value plus 50% of the  
dehumidification control band. If the return air humidity level continues to increase  
the second dehumidification stage actives at 54%RH or ½ of the programmed  
dead value plus 100% of the programmed humidity proportional control band.  
When the return air humidity level decreases to 53%RH or ½ of the programmed  
dead band value plus 50% of the programmed proportional control band the  
second dehumidification stage is deactivated. When the return humidity level  
decreases to 51%RH or ½ of the dead band value plus 0% of the programmed  
proportional control band the first stage dehumidification deactivated.  
Reheating during Dehumidification  
The Parameter Electric Reheat Enabled defines how the reheats react when the  
return air temperature decreases below the temperature set point during the  
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dehumidification process. The end user can choose to select from the following  
selections:  
Parameter Operation  
No electric reheat allowed during compressorized  
dehumidification operation.  
No  
Electric reheat operates as normal. A decrease in  
Normal  
return air temperature below set point will start  
reheats as described previously in his chapter.  
No low limit reached / low limit reset: heaters  
Delayed disabled. Only one of two compressors operating in  
dehum or low limit 1 reached: heaters enabled  
Normal or Delayed Reheat (2-Stage Dehumidification Only)  
When normal reheat (factory default) control is selected, the unit reheats are not  
disabled during dehumidification, even if both compressors are operating. As the  
return air temperature decreases below the temperature set point the reheats will  
stage on and off as described earlier in this chapter.  
If delayed reheat is selected and both compressors are operating for  
dehumidification control, the reheats are disabled until only one compressor is  
required. If, during reheat disable, the return air temperature decreases far  
enough below the temperature set point to require 150% total available reheat  
capacity, then dehumidification is disabled and reheats are activated.  
When the return temperature raises to the point where reheat is no longer  
required, then dehumidification operation is re-enabled. However, if the amount of  
time that both compressors were operating prior to being disabled by the low  
temperature condition was less than 10 minutes, then only one compressor is  
allowed to operate for subsequent dehumidification requirements. This prevents  
excessive system cycling, which can occur if the room heat load is small. Once  
the requirement for dehumidification is no longer present, then both compressors  
are enabled.  
Caution:  
Dehumidification with normal reheat allows for operating both compressors and  
reheats simultaneously. It is very important that the electrical service to the unit be  
sized and wired for this option if selected. If not sized properly the electrical  
service could experience nuisance trips and or possible damage to building circuit  
breakers (or Fuses) and wiring.  
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Additional Programs  
Start  
The unit fan is activated. The unit can be switched on/ off from 2 inputs:  
1. Remote on/ off input (RSD – Remote Shutdown Device)  
2. Display button  
Note: Switches 1 and 2 are in series; the unit will start only if both switches are in  
the on position. If either switch is in the off position the unit will stop  
Display button(s)  
Remon/off  
Auto restart  
When there is a power outage the unit will provide an automatic restart on power  
restoration when programmed. The unit will start and the loads will sequence on  
with the Fan first, the first Cooling need and so forth until all loads are on as the  
room requirement demands.  
The Unit Auto Restart Sequence (customer programmable) takes place. Each  
unit will restart by this program, however, with a network of units, the start loop will  
start the next unit at each individual time when elapsed beginning with unit number  
ID #1. The unit control start sequence will start at this point as well.  
Power on  
Unit 1  
on  
Unit 2  
on  
Unit 3  
on  
Unit 4  
on  
Autorestart Autorestart Autorestart Autorestart  
Control 1  
on  
Control 2  
on  
Control 3  
on  
Control 4  
on  
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Fan Alarm / Fan settings  
The fan operation is controlled by two (2) digital devices: the Loss of Airflow  
differential pressure switch and the Main fan Overload motor protection. The  
time delay at the unit start is always 5 seconds shorter than the control delay.  
High Pressure Cutout  
The control uses high head lockout functionality. If one compressor trips or is  
locked out on high head, the other compressor turns on when the space  
temperature increases 1°F. Pressing the alarm button on the display twice can  
reset high head Alarm. A lockout condition occurs on the third trip and must be  
reset by turning the main power switch to off then back on.  
Suction Pressure Transducer  
The suction pressure transducer operation is only on air conditioning products (not  
chiller applications). Transducer measurements are made at least once every 1  
second. With all other operating times for all compressors, additional  
measurements, shall be taken based on operation “at limit conditions” for 5  
seconds and shall not include readings taken during Pumpdown or Winter Start  
Kit (WSK) timeout.  
Call for Cooling  
The following applies for both R22 and R407C systems and applies to all  
compressor types. The call for cooling opens the Liquid Line Solenoid Valve  
(LLSV). Note: on units with Digital Scroll Compressors the unloader is energized  
0.1 second before the compressor contactor is energized. On air-cooled units with  
fan speed type condenser (FSC) the low pressure start threshold is 35psiG  
(50psiA). On air-cooled units with lee-temp control (LT) and all fluid cooled  
units the low-pressure start threshold is 60psiG (75psiA).  
All compressorized units use the following start  
sequence:  
Open LLSV, if WSK is set to 0, wait for suction pressure to reach setting, then start  
compressor and freeze protection timer.  
If WSK is set greater than 0, operate the compressor for the WSK override time  
and monitor suction transducer value.  
If pressure is achieved the compressor is allowed to operate, and the freeze  
protection timer is started.  
If pressure is not achieved, turn compressor off and leave LLSV open.  
If pressure is achieved within next 30 seconds the compressor is allowed to  
operate, and the freeze protection timer is started.  
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The Startup and Freeze Protection Program  
The sequence for the call for cooling with the program features is as follows:  
The need for cooling is defined by the control setting for the temperature setpoint,  
proportional band, and deadband (if used). At this point the Winter Start Kit (WSK)  
time delay is the wait period for the compressor to run without the indication of the  
low-pressure condition (also known as LP bypass). The WSK time delay is  
programmable with a range of 0 - 5 minutes. If the LP switch setting is achieved in  
this time then full cooling is in process with the Freeze Protection (FP) now  
watching the LP for an additional 10 minutes (fixed). If the LP remains closed the  
cooling process continues.  
If the WSK is not made in the set time period the cooling process stops and waits  
an additional 5 minutes with the compressor off (no pumpdown). The liquid line  
solenoid valve will remain open during this time period. If the LP switch is made  
the control will now advance and wait for the freeze protection time delay as stated  
as above. If the LP switch does not prove in the WSK time delay period plus the 5  
minute wait period, the compressor is locked off and the Low Suction Pressure  
Alarm will activate. A power off/ on reset is required to reset the cooling function.  
If the WSK is made and the control is in the 10 minute Freeze Protection (FP) wait  
time period and this function does not prove the LP the control will go into  
additional 10 minute wait (fixed), with the compressor off (no pumpdown) and the  
liquid line solenoid valve to remain open. If the freeze protection does not make  
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during the second time frame the cooling process locks off and will require a  
power off sequence.  
Next Maintenance Calculation  
Foreword  
The next maintenance calculation will help run the Liebert Environmental unit in an  
optimum way, to ensure minimum components stress resulting in increased  
reliability.  
Calculation of next Maintenance Parameters  
The following components are included in the calculation individually:  
Fan(s)  
Compressor 1  
Compressor 2  
Electric Heaters  
Humidifier  
For each individual component the next maintenance will be calculated from  
following parameters:  
1. Standard service interval (1, 2, 4 or 6 times a year, to be programmed).  
2. Working hours (counted).  
3. Number of starts (counted).  
4. Average running time (calculated).  
5. Optimum number of starts per hour (to be programmed).  
6. Maximum number of starts per hour (to be programmed).  
7. Maximum bonus to enlarge time to next maintenance (to be programmed).  
8. Maximum penalty to reduce time to next maintenance (to be programmed).  
The Maintenance Calculation is done as follows:  
Basic: maintenance frequency (1). The control counts the working hours of the  
component, as well as the number of starts.  
The working hours and the number of starts are compared with the programmed  
optimum / maximum starts per hour. This results in “Wellness Factor”.  
This factor, in accordance to the service interval, will add a “Bonus” to increase the  
time before the next maintenance, or will add a “Penalty” to decrease the time  
before the next maintenance. In simple words: If a component starts very often,  
the time to next maintenance will be decreased, if it starts rarely, the time to next  
maintenance will be increased.  
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The control always takes the component with the most on/ off (cycling) as the  
reference component, which asking for the nearest maintenance (example: if the  
fan runs continuously, but the compressor switches on/off all the time, the next  
maintenance will be calculated from the compressor).  
Alarms or warnings (like clogged filter, high or low pressure, fans alarm etc.) will  
decrease the time to next maintenance immediately to 0. If the alarm was reset,  
the original situation will be displayed again, but the alarm will be counted in the  
diagnostics window.  
The display’s main window provides information about the next maintenance:  
a bar graph (graphical display screen) will fill in, as the next maintenance gets  
closer (the width of the graph equals to the standard maintenance Interval (1, 2, 4  
or 6 times a year). The date of the next maintenance is also displayed.  
Parameters for next Maintenance Calculation:  
General Maintenance Settings:  
Maintenance Frequency: can be set at 1, 2, 4 or 6 times a year. “NO” means  
the maintenance calculation program is disabled.  
Maximum Bonus: this value increases the time to next maintenance with the set  
value, if all components run in optimum way (number of starts, average running  
time).  
Maximum Penalty: this value decreases the time to next maintenance with the  
set value, if some components run in non-optimum way (number of starts, average  
running time).  
Last Maintenance: this date can be will be set by the calculations and the  
service-engineer and others to view.  
Service-Engineer: name can be added and edited.  
Reset: puts all counters of all components (fans, compressors, ect.) to 0, and  
starts new maintenance calculation (always reset after maintenance is completed).  
Fans / Heaters / Humidifier Settings / Compressor 1 /2 Settings  
Number of starts and Working hours: counted from the last maintenance. Total  
working hours can be read in the standard working hours window (customer  
window).  
Average Working Hours: calculated by the number of starts and working hours  
of each component.  
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Starts per Day Optimum: the number of individual component starts that is  
considered as good or optimum. To be set by Service Engineer.  
Starts per Day Worst: the number of individual component starts that is  
considered as “hunting” or worst case. To be set by Service Engineer.  
Number of Alarms: counts the number of alarms occurring between service  
intervals.  
Actual Bonus: calculated from “number of starts” and “average working time”  
values. The result can be positive (for a bonus) or negative (for a penalty). This  
value influences the time remaining to the next maintenance.  
Shared Parameters an understanding  
If we have multiple units in the same room (zone) they will need to communicate  
with each other to avoid opposite operational functions. This will prevent the  
cooling and heating functions from operating at the same time on different units.  
This condition called “fighting “ often exists in the room due to imbalanced loads  
and the crossing of airflow conditions. This is also considered when using the  
Lead/ Lag and Cascade functions.  
When a system is setup the parameters are shared by all units. The unit selected  
as the Lead Unit (#1 unit) is used to program the system, if program parameters  
are not set in this unit they will be ignored. This is true for all of the active units in  
the system. However, if a unit in the system is not active it will be ignored until it is  
active and the parameters will be shared within 2 minutes of activation.  
Shared Temperature and Humidity parameters example:  
Two units share the master Temperature Control (1/2) Proportional Band Setting  
such as 10°F, and then each unit will use the master band divided by 2 (units) or  
5°F proportional bands. To avoid the cooling hunting process or compressor  
cycling too quickly, the primary temperature proportional band needs to be set  
wide enough to compensate for the number of units in the system setup. Note that  
shared parameters are not used on single unit applications.  
Heating, humidification, and dehumidification will follow the same example with  
each function starting in each unit one after the other or in sequence.  
In Chilled Water units all valves operate are in parallel but this operation may be  
overridden by the setting and use of the Supply Limit sensor. This parameter is  
controlled by the individual unit. Here we may see uneven valve positioning  
(operation) in some of the units.  
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Freecooling and Dual cooling will operate in the same manner as chilled water  
with the supervision of the Supply Limit, again showing different valve positions on  
the units  
If in a Freecooling or Dual Cooling unit if the limit of the coil operation is detected  
(no free cooling or no CW available) the valve will close off and unit will become  
DX operation in the system.  
Networking and Functions  
Unit 2 Unit (U2U) Communications by networking will allow the following  
functions to be placed into operation when the requirements exist. The user  
must install the correct hardware and properly program the units for the  
functionality.  
In the iCOM Network the owner may perform the following functions:  
The Teamwork Mode functions, which allow multiple stages of Cooling/ Heating  
and/ or Humidification/ Dehumidification. The ability to prevent the units fighting is  
included in this feature.  
The Lead/ Lag function, which allows one or more units to be set as “Running and  
Standby” for activation in case of an alarm. This also has the ability to be  
programmed in a rotation for assurance of functional standbys.  
The Cascade function, which allows additional units to be staged on based on the  
temperature or humidity requirement.  
Understanding the iCOM Network setup process:  
To setup a system network with the iCOM control requires a complete  
understanding of the control processes and parameter programming to insure the  
proper functional operation without incident. To insure the setup is correct and  
that the operation will function as selected you need to map both the room layout  
and the unit setup. First, read and record all programmed settings in all of the  
single units. Second, document the network parameter settings that are needed  
and identify the numerical order of the units to be networked. The order of the  
setup process is very important.  
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The Basics for Cooling Unit Placement:  
Installation instructions are found in the product manuals for the Cooling units.  
Networking setup should include these additional factors for planning.  
Locations of heat loads in conditioned space.  
Air distribution for cooling.  
Number of operating units versus standby.  
The Basics for Hardware:  
Multi-unit networking requires the following hardware:  
Minimum Network Switch Requirements:  
IEEE 802.3, IEEE 802.3u  
10/100 Mbps speed  
Multiple RJ-45 ports – one shared RJ45 uplink  
CAT 5 patch cables (straight through) in the proper lengths not to exceed  
150 ft. maximum length each. One for each board and display added into  
the iCOM network. Cable management will apply.  
The Basic for Programming:  
An IP address number will be used to identify each receiver/ sender of information.  
(See Computer and Network Terms in Training and Service Manual)  
The iCOM Network is a Class C Private Network and will use the 192.168.254.xxx  
series of static IP address. This has nothing to do with the local building or owner  
network. The iCOM Network may only be attached to these networks through a  
WEB Card or 485 Card using the Liebert Intellislot.  
A series of basic rules must be followed to connect and program the units for this  
private iCOM Network. See the following rules.  
1. Small Displays are CAN connections only, programming of single unit  
parameters is required.  
2. Small Displays CANNOT look at or program other iCOM Network functions.  
3. Small Displays may be networked with a CAT 5 crossover cable (2 units).  
4. All Large Displays and Control Boards will use a CAT 5 or greater straight  
through (patch) cables to connect to the switch.  
5. One large Display (Wall Mount) with a separate power adapter may be used  
with multiple units (Control Boards and Small Displays) through the network  
switch.  
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6. Each set of unit control boards must be set up individually, then connected to  
the network switch and checked before the next board can be setup  
6a. Large Displays and Control Boards must each be programmed with a  
different IP Address.  
Example: Display: 192.168.254.001  
Example: Control Board: 192.168.254.010  
6b. Each Display and Control Board in the iCOM network must have the  
same Gateway IP address.  
Example: Gateway IP: 192.168.254.75  
6c. Each Display and Control Board in the iCOM network must have the  
same Netmask IP address.  
Example: Netmask IP = 255.255.255.000  
6d. The Unit to Unit (U2U) address must be programmed in the necessary  
order for setup.  
Example: Unit Display: 33 – 64 and Unit Control Board: 1 - 32  
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Setting Parameters  
Example: 2 Units with Small Display’s  
All Network parameters are viewed and programmed using the  
Service Menu function and by selecting the Network Setup Icon  
The following example references menu lines on the Network Setup screen:  
Line S802: Number units connected: xx (2)  
Line S803: Teamwork: xx (No, 1, 2)  
Line S804: Control Board IP Address: 192.168.254. xxx (010, 011)  
Line S805: Control Board Netmask IP the same for all units  
Line S806: Control Board Gateway IP the same for all units  
Line S808: U2U address Control Board #: xx (1-2)  
Line S810: U2U group #: xx (1)  
U2U: CAT5 (Crossover-cable)  
Unit No. 1  
Unit No. 2  
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Example: 2 Units, One Large Display and One Small Display  
All Network parameters are viewed and programmed using the  
Service Menu function and by selecting the Network Setup Icon  
The following example references menu lines on the Network Setup screen:  
Line S802: Number units connected: xx (2)  
Line S803: Teamwork: xx (No, 1, 2)  
Line S804: Large Display Board IP Address: 192.168.254. xxx (001 - 049)  
Line S804: Control Board IP Address: 192.168.254. xxx (050 - 099)  
Line S805: Large Display Board Netmask IP: 255.255.255.000  
Line S805: Control Board Netmask IP: 255.255.255.000  
Line S806: Large Display Board Gateway IP: 192.168.254.255  
Line S806: Control Board Gateway IP: 192.168.254.255  
Line S808: U2U address Display #: xx (33 - 64)  
Line S808: U2U address Control Board #: xx (1 - 32)  
Line S810: U2U group #: xx (1 - 99)  
CAT5 (Patch-cable) and  
(CAN)  
Power  
Switch  
Unit No. 2  
Unit No. 1  
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Example: Large Wall Display and Five Units with Small Displays  
All Network parameters are viewed and programmed using the  
Service Menu function and by selecting the Network Setup Icon  
The following example references menu lines on the Network Setup screen:  
Line S802: Number units connected: xx (01 - 32)  
Line S803: Teamwork: xx (No, 1, 2)  
Line S804: Large Display Board IP Address: 192.168.254. xxx (001 - 049)  
Line S804: Control Board IP Address: 192.168.254. xxx (050 - 099)  
Line S804: Wall Mount (LBB) IP Address: 192.168.254. xxx (100 - 149)  
Line S806: Large Display Board Gateway IP: 192.168.254.255  
Line S806: Control Board Gateway IP: 192.168.254.255  
Line S808: U2U address Display #: xx (33 - 64)  
Line S808: U2U address Control Board #: xx (01 - 32)  
Line S810: U2U group #: xx (01 - 99)  
Switc  
U2U:  
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Example: 4 Units in 2 Groups with 2 Large Displays  
All Network parameters are viewed and programmed using the  
Service Menu function and by selecting the Network Setup Icon  
The following example references menu lines on the Network Setup screen:  
Line S802: Number units connected: xx (01 - 32)  
Line S803: Teamwork: xx (No, 1, 2)  
Line S804: Large Display Board IP Address: 192.168.254. xxx (001 - 008)  
Line S804: Control Board IP Address: 192.168.254. xxx (010 - 080)  
Line S806: Large Display Board Gateway IP: 192.168.254.xxx (000 – 254)  
Line S806: Control Board Gateway IP: 192.168.254.xxx (000 – 254)  
Line S808: U2U address Display #: xx (33 - 64)  
Line S808: U2U address Control Board #: xx (01 - 32)  
Line S810: U2U group #: xx (01 - 99)  
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Teamwork  
Teamwork Modes  
Teamwork is the ability to group unit functionality, while connected in a network, to  
provide the ability to work together as a team and address control functions in  
three different teamwork modes:  
“No” Teamwork  
In this mode all units are working independently for control and functionality. No  
values or sensors are shared. While in this mode units may be setup to provide  
the Lead/ Lag function and rotation, however, units may not be setup in the  
Cascade functionality.  
Teamwork Mode 1  
In this mode unit parameters (system settings) are shared if the system value is  
set in any of the units, all units will follow with same settings. (See Glossary of  
Unit and System parameters section).  
The return air temperature and humidity sensed by each unit in the network will be  
averaged and used for control by the lead unit.  
The Lead Unit designation #1 and will provide the calculations for the system  
requirements and will provide the calculated divisions of the proportional band to  
each of the units to start the required operations. The width of the proportional  
band in multiple unit configurations is shown as normal, but internally the lead unit  
(unit #1) sends the requests to the other units and multiplies this width by the  
number of available units in the program.  
To be an available unit for operations in this mode:  
a) The unit cannot be in a standby (lead/lag) configuration: all units must be on  
b) The units in the cascade function are not off or set with alarms functions to  
be switch off.  
This mode of control will drive all Chilled Water or FreeCooling actuators in parallel  
for all units operating in the teamwork mode. The individual unit will control its  
own Dual Cooling switchover functions, the low temperature functions and low  
discharge air functions.  
Teamwork Mode 1 will rotate the lead unit by 1 unit every 24 hours.  
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Teamwork Mode 2  
In teamwork mode 2 all system parameters are shared equally as in teamwork  
mode 1. The lead unit will define the temperature and humidity averages for the  
operational needs if there is a request for cooling, heating, dehumidification or  
humidification.  
If there is a temperature control request because of a need for either cooling or  
heating (determined by highest or lowest temperature of all the units), teamwork  
mode 2 activates all of the connected units. Each unit will operate in the cooling or  
heating mode using their individual temperature control settings. If in the cooling  
mode the heating function is disabled in all units. If in the heating mode the  
cooling function is disabled in all units.  
If there is a humidity control request because of a need for either humidification or  
dehumidification (determined by highest or lowest humidity of all the units),  
teamwork mode 2 activates all of the connected units. Each unit will operate in the  
humidification or dehumidification mode using their individual humidity control  
settings. If in the humidification mode the dehumidification function is disabled in  
all units. If in the dehumidification mode the humidification function is disabled in  
all units.  
Teamwork Mode 2 does not allow unit rotation (lead/ lag), unbalanced unit working  
hours are to be expected.  
Unit Lead/ Lag or Running/ Standby Function  
This program will allow the user to select the multi-unit function of Lead and Lag,  
or as sometimes stated Running and Standby, by selecting the number of running  
and standby units to provide the redundancy needed in the space.  
Typical Lead/ Lag (Running/ Standby) Function  
The lead/ lag operational sequence has a lead (running) unit operating and an  
alarm becomes active (selected by alarm programming). The active alarm in the  
lead unit will cause the first lag (standby) unit to active and maintain the space  
conditions. If multiple units are selected as lag (standby) the units will continue to  
rotate on active alarms as long as a lag unit is available. If there are no lag  
(standby) units left in the sequence the first failed will restart (if not in a critical  
alarm state i.e. fan overload, etc).  
Note: The unit with the active alarm will operate in the fan only mode for 3  
minutes before going into a standby mode to stabilize conditions, then it will turn  
off.  
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The Lead/ Lag function may be used in the either the No Teamwork Mode, in  
Teamwork 1 Mode and in Teamwork 2 Mode. One or more units can be defined  
as lag (standby), the normal status of the lag (standby) unit(s) is off.  
The lag or standby function can be performed as a daily rotation (setting the time),  
weekly rotation (setting the day of the week and time) or as a monthly rotation.  
The units will rotate based on the programmed number of units:  
Example A: if the rotation is set in the “Rotate by 1” parameter, the standby units  
will rotate from 1 to 2 or 2 to 3 or 3 to 4 or 4 to1 in a basic 4 unit configuration.  
Example B: if the rotation is set in the “Rotate by 2” parameter, the standby units  
will rotate from 1 - 2 to 3 - 4 or 3 - 4 to 1 - 2 in a basic 4 unit configuration.  
Standby & Cascade  
This program function will activate the lag (standby) unit(s) when an active alarm  
in a running unit is detected. This program parameter will also provide for unit  
staging. With an increase or decrease in either the temperature and/ or humidity  
conditions is sensed in the operating units the additional standby unit(s) will be  
activated to aid in the control of the space requirements.  
The Cascade function operates in Teamwork Mode 1 only. The Cascaded units  
are not part of the system temperature and humidity average.  
Settings are:  
Cascade Active  
Yes/ No  
Yes/ No  
Temp  
Cascade Cool/ Heat and Humid./ Dehumid.  
Cascade for Cooling and Heating  
Cascade for Cooling only  
Cool  
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Notes:  
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Chapter 2  
Programming Functions  
The standard iCOM control is supplied with a front panel mounted small display  
screen display which features a 128 x 64 dot matrix graphics. The display  
provides both descriptive text readouts and two (2) menu icons. The optional  
large screen display features a 320 x 240 dot matrix graphic display that shows  
user and service icons as well as descriptive text and graphics. The information  
provided visually on either of these displays is: room temperature and humidity,  
temperature and humidity set points, alarm status and settings, event histories and  
the current time. All programming functions will be done through the supplied  
display.  
Small Graphic Display  
with Panel Mount Bezel  
Optional Large Graphic  
Display with Panel  
Mount Bezel  
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iCOM Display Components and Functions  
The large display is shown for reference. The keypad and LEDs are identical on  
all displays.  
Liquid Crystal display  
LED Status Indicators  
Top LED is red or flashing red - alarm,  
Bottom LED is amber (power on) or green (unit on)  
Keypad  
iCOM Keyboard Layout:  
The iCOM control screen displays text and icons for monitoring and programming  
your Liebert unit and/ or network of units. The number of icons and the amount of  
text shown depends upon the display type supplied on your unit. From the default  
menu, the user menu may be accessed by pressing the enter key. When the user  
selects an icon the various submenus, set points, status, thresholds and service  
information is displayed. The following defines the various keyboard icons and  
functions.  
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iCOM Keyboard Layout:  
Icon  
Key Name Function  
On/ Off Key  
Alarm Key  
Help Key  
Controls the operation state of the unit.  
Silences the audible alarm.  
Accesses the integrated help menus.  
ESCape Key Returns to the previous display.  
Enter Key Confirms all selections, icons and text.  
Increase Key Moves upward through the menu or increases the  
(Up Arrow) value of the selected parameter.  
Decrease Key Moves downward through the menu or decreases  
(Down Arrow) the value of the selected parameter.  
Navigates through text and selections of the  
Left Arrow Key  
display.  
Right Arrow  
Key  
Navigates through text and selections of the  
display.  
Blinking Red: Active, unacknowledged alarm  
exists.  
Upper LED  
Lower LED  
Solid Red: Active, acknowledged alarm exists.  
Amber: Power available to the unit, unit NOT  
operating.  
Green: Power available to the unit, unit is  
operating.  
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iCOM Display Symbols/ Icons  
fan  
hot water  
horn  
compressor  
el. heaters  
freecooling  
maintenance  
dehum  
hum  
The iCOM programming functions are separated into three (3) basic menus:  
User Menu  
Service Menu  
Advanced Menu  
When the desired icon has been selected, press the enter key. If the selected  
menu item has submenus, they are now revealed. If there are no submenus, the  
function or setting or command level text is displayed. User and Service menu  
settings are readable without a password, changing the programmed values  
requires a password. When a password is required to perform a programming  
function, the iCOM displays a password prompt. Advanced menu setting requires  
a password to read and program.  
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Programming Functions  
Status Display  
The unit display will show the unit operational mode(s), return air temperature/  
humidity readings and if active present alarm conditions. The end user can select  
from two (2) display types, graphical or simple.  
System View Screen Graphic  
Unit View Screen Simple  
The Large and Small Display’s have the ability to present information in two  
formats; the Graphic format will show the set points and/or the actual values of  
the return air temperature and humidity readings. The operational functions of the  
components are displayed with an icon and a bar graph to indicate to amount of  
the required function. The bottom of the screen will indicate date, time, on/off  
status and events. The message area below will provide additional information and  
provide some basic navigation help. The Simple format will reduce the amount of  
graphics displayed and offers a not so busy display of the same information. The  
displays will provide the System and Unit views  
The end user can also select from dark background with white text or light  
background with dark text.  
Graphic Screen with reversed Contrast  
56  
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Menu Screens ICON Symbols  
Menu Parameters Names  
Level 1: User  
Level 2: Service  
Level 3: Advanced  
Readable w/o password  
PW required to program  
Readable w/o password  
PW required to program  
PW required to read  
or program  
1
2
Setpoints  
Setpoints  
Unit Diary  
Factory Settings  
Spare Parts List  
3
Events Log/ Status Report Standby Settings/ Lead-Lag  
4
Graphics  
Maintenance/ Wellness Settings  
Diagnostics/ Service Mode  
Set Alarms  
5
View Network  
Set Alarms  
6
7
8
Change Passwords  
9
Various Sensors  
Sensor Calibration/ Sewtup  
10  
11 Display Setup  
System/ Network Setup  
Options Setup  
12 Total Run Hours  
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User Menu Icons and Descriptions:  
Available  
Display  
Icon  
Name  
Descriptions  
°C/ °F  
% RH  
SET  
To view and change temperature  
and humidity set points  
Small and  
Large  
Set Points  
Spare Parts  
List  
Displays the spare parts list of the  
unit  
Large  
EVENT  
LOG  
Contains a log of the last 400  
events  
Small and  
Large  
Event Log  
Graphic Data Displays the temperature and  
Small and  
Large  
Record  
humidity graphs  
Shows the status of all connected  
units  
View Network  
Large  
Allows the enabling, disabling and  
setting of the alarm parameters  
Small and  
Large  
Set Alarms  
Shows readings for the standard  
and optional sensors  
Small and  
Large  
Sensor Data  
Change the settings for display,  
Display Setup language, time and simple or  
graphic display  
Small and  
Large  
Records the run time of all  
Total Run  
Small and  
Large  
components and allows for  
Hours  
setting the limits on run time  
Allows for setback programming  
Sleep Mode  
Small and  
Large  
for non-peak operation  
Contains key contact information  
Service  
for local service, including names  
Contacts  
Large  
and phone numbers  
58  
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Service Menu Icons and Descriptions:  
Available  
Display  
Icon  
Name  
Descriptions  
°C/ °F  
% RH  
SET  
To view and change temperature  
and humidity set points  
Small and  
Large  
Set Points  
Is a notepad containing notes  
from the service person or  
customer  
Unit Diary  
Large  
Programs lead/ lag setup when  
multiple units are connected  
together  
Standby  
Settings  
Small and  
Large  
Allows programming of the  
Maintenance/ maintenance interval reminder,  
Small and  
Large  
Wellness  
Settings  
maintenance messages, number  
of unit starts and stops, time  
since last maintenance  
Allows for troubleshooting,  
manual mode and viewing of the  
analog and digital inputs  
Diagnostic/  
Service Mode  
Small and  
Large  
Allows the enabling, disabling and  
setting of the alarm parameters  
Small and  
Large  
Set Alarms  
Sensor  
Calibration/  
Setup  
Allows for the calibration of the  
various sensors  
Small and  
Large  
System/  
Allows for setup and unit-2-unit  
Large  
Network Setup communication for multiple units  
Allows for the setup of component  
Small and  
Large  
Options Setup  
operation  
Contains key contact information  
Service  
Small and  
Large  
for local service, including names  
Contacts  
and phone numbers  
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Advanced Menu Icons and Descriptions:  
Available  
Display  
Icon  
Name  
Descriptions  
Factory configuration files. Do  
Not Change Settings Consult  
the Factory First  
Factory  
Settings  
Small and  
Large  
Change  
Passwords  
Allows the user to change the  
various passwords  
Small and  
Large  
Menu Parameters  
All of the various parameters and program ranges are shown in tables located in  
this chapter. The following sections highlight the various parameters and  
programs in the iCOM control.  
User Menu Parameters  
The User menu displays the various unit operating values and status icons. The  
factory default password to access the user menu items for programming is “149”.  
The User Menu selections include the following choices in the order shown:  
Set Point Parameters  
Spare Part List  
Event Log  
Graphics Log Parameters  
View Network Parameters  
Set Alarm Parameters  
Sensor Parameters  
Active Alarms  
Display Setup Parameters  
Total Run Hours  
Sleep Mode Timer Parameters  
Service Contacts Information  
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User Menu: Set Point Parameters U100 series  
Menu Line  
U101  
U102  
U103  
U104  
U105  
U106  
U107  
U108  
U109  
U110  
U111  
Parameter  
Password  
Default  
-
Range  
-
Temperature Setpoint  
Humidity Setpoint  
73ºF  
50%  
41 - 104ºF  
1 – 80%  
Humidity Control Type  
Supply Limit  
Yes  
Yes or No  
Disabled or Enabled  
41 - 77°F  
Disabled  
41°F  
Supply Limit Temp Value  
User Menu: Spare Parts List, Large Display Only  
Parameter  
Unit spare parts list  
User Menu: Event Log  
Parameter  
Stores the last 400 events (messages, warnings and  
alarms a that have occurred  
61  
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User Menu: Graphics Parameters  
Parameter  
Default  
Range  
8, 32 min or 1, 12, 24 hours  
or 2, 4, 8, 16 days  
System Temperature Time Scale  
System Temperature Graph Height  
System Humidity Time Scale  
System Humidity Graph Height  
Unit Temperature Time Scale  
Unit Temperature Graph Height  
Unit Humidity Time Scale  
24 Hours  
9ºF  
±36ºF  
8, 32 min or 1, 12, 24 hours  
or 2, 4, 8, 16 days  
24 Hours  
10%  
±20%  
8, 32 min or 1, 12, 24 hours  
or 2, 4, 8, 16 days  
24 Hours  
9ºF  
±36ºF  
8, 32 min or 1, 12, 24 hours  
or 2, 4, 8, 16 days  
24 Hours  
10%  
Unit humidity Graph Height  
±20%  
User Menu: View Network Parameters  
Parameter  
User to select and view status of all units connected  
together (only Large Display)  
62  
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User Menu: Set Alarm Parameters U200 series  
Menu Line  
U201  
U202  
U203  
U204  
U205  
U206  
U207  
U208  
U209  
U210  
U211  
Parameter  
Password  
Default  
-
Range  
-
Return Sensor Alarms  
High Return Temperature  
Low Return Temperature  
High Return Humidity  
Low Return Humidity  
Enabled  
80ºF  
Enabled or Disabled  
33 - 210ºF  
33 - 210ºF  
1 – 99%  
60ºF  
60%  
40%  
1 – 99%  
Sensor A Alarms  
Disabled  
90ºF  
Disabled or Enabled  
33 - 210ºF  
33 - 210ºF  
1 - 99%  
High Temperature Sensor A  
Low Temperature Sensor A  
High Humidity Sensor A  
Low Humidity Sensor A  
55ºF  
70%  
30%  
1 - 99%  
User Menu: Sensor Data U300 series: Page 1 of 2  
Menu Line  
U301  
U302  
U303  
U304  
U305  
U306  
U307  
U308  
U309  
U310  
Parameter  
Range  
41 – 104ºF  
20 – 80%  
32 - 122ºF  
20 – 80%  
32 - 122ºF  
20 – 80%  
32 - 122ºF  
20 – 80%  
4 - 113ºF  
Actual Temperature Setpoint  
Actual Humidity Setpoint  
Optional Sensor A Temperature  
Optional Sensor A Humidity  
Optional Sensor B Temperature  
Optional Sensor B Humidity  
Optional Sensor C Temperature  
Optional Sensor C Humidity  
Freecooling Fluid Temperature  
DigiScroll 1 Temperature  
DigiScroll 2 Temperature  
Freecooling Status  
84 - 313ºF  
84 - 313ºF  
Off, Start, On  
U311  
U312  
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User Menu: Sensor Data U300 series: Page 1 of 2  
Menu Line  
U313  
Parameter  
Daily High Temperture  
Daily Low Temperature  
Daily High Humidity  
Daily Low Humidity  
Time/ Value  
U314  
U315  
U316  
User Menu: Active Alarms Parameters  
Parameter  
User to view all active alarms of all units connected  
together (only Large Display)  
User Menu: Display Setup Parameters U400 series  
Menu Line  
U401  
Parameter  
Language  
Default  
Range  
English . . .  
MM/ DD/ YYYY  
HH/ MM/ SS  
ºF/ ºC  
English  
U402  
Date (Month/Day/Year) MM/ DD/ YYYY  
U403  
Time (Hrs:Min:Sec)  
Temperature Indication  
Display Contrast  
-
ºF  
U404  
U405  
80%  
0 – 100%  
U406  
Buzzer Frequency  
On at 80%  
On, Off, 0 – 100%  
Backlite Off After x  
Hours  
U407  
5 minute  
5 min – 12 hours  
U408  
U409  
U410  
Screen  
Simple  
Set + Act  
Normal  
Simple or Graphical  
Set + Act, Set, Act  
Normal or Inverted  
Display Shows  
Display Colors  
yyyy-mm-dd  
dd.mm.yyyy  
mm/dd/yyyy  
U411  
Date Format  
dd.mm.yyyy  
64  
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User Menu: Total Run Hours Parameters U500 series  
Menu Line  
U501  
U502  
U503  
U504  
U505  
U506  
U507  
U508  
U509  
U510  
U511  
Parameter  
Range (Hours)  
Actual  
-
Fan motor(s)  
0 - 32000  
0 - 32000  
0 - 32000  
0 - 32000  
0 - 32000  
0 - 32000  
0 - 32000  
0 - 32000  
0 - 32000  
0 - 32000  
Compressor 1  
Compressor 2  
Chilled Water/ Free Cool  
Hot Gas / Hot Water  
Electrical Heater 1  
Electrical Heater 2  
Electrical Heater 3  
Humidifier  
Dehumidification  
User Menu: Sleep Mode Parameters U600 series  
Menu Line  
U601  
Parameter  
Password  
Default  
Range  
-
-
-
-
U602  
Sleep On  
Mon, Tue, Wed, Thu,  
Fri, Sat, Sun  
U603  
No  
No or Yes  
U604  
U605  
U606  
U607  
U608  
U609  
U610  
U611  
Sleep Every Day (1)  
From / To  
-
-
00:00 / 00:00  
-
Time (hh:mm)  
-
Sleep Every Day (2)  
From / To  
00:00 / 00:00  
Time (hh:mm)  
Timer Mode  
No  
System Off  
4ºF  
No, Yes, Auto  
Sys off, Deadband  
4 - 27ºF  
Timer Mode Type  
Dead Band  
65  
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User Menu: Service Contacts U700 series  
Menu Line  
U701  
Parameter  
Range  
U702  
U703  
Address Line 1  
Address Line 2  
Address Line 3  
Address Line 4  
Text String  
Text String  
Text String  
Text String  
U704  
U705  
U706  
66  
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Service Menu Parameters  
The Service menu display allows the user to customize the various unit settings for  
site specific operation. The factory default password to access the service menu  
items for programming is “501”. The Service Menu selections include the following  
choices in the order shown:  
Set Point Parameters  
Unit Diary  
Standby Settings Parameters  
Maintenance / Wellness Setting Parameters  
Diagnostic / Service Mode Parameters  
Set Alarm Parameters  
Sensor Calibration / Setup Parameters  
System / Network Setup Parameters  
Operations Setup Parameters  
Service Contacts Parameters  
Service Menu: Set Point Parameters S100 series: Page 1 of 2  
Menu Line  
S101  
S102  
S103  
S104  
S105  
S106  
S107  
S108  
S109  
S110  
S111  
Parameter  
Default  
-
Range  
-
Password  
Temperature Setpoint  
Humidity Setpoint  
73ºF  
50%  
Yes  
Disabled  
41ºF  
Yes  
7ºF  
41 - 104ºF  
1 – 80%  
Humidity Control Type  
Supply Limit  
Yes or No  
Disabled or Enabled  
41 - 77ºF  
Supply Limit Temp Value  
Autoset Enable  
Yes or No  
2 - 54ºF  
Temperature Proportional Band  
Temperature Integration Time  
Temperature Deadband  
Short Cycle Control  
0
0 – 5 minutes  
0 - 36ºF  
0
Yes  
Yes or No  
67  
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Service Menu: Set Point Parameters S100 series: Page 2 of 2  
Menu Line  
S112  
Parameter  
Default  
Range  
-
Password  
-
10%  
0
S113  
Humidity Proportional Band  
Humidity Integration Time  
Humidity Deadband  
1 – 20%  
0 – 5 minutes  
0 – 50%  
S114  
S115  
0
Disable, Contact,  
Value  
S116  
DT Between Room / FC Type  
Disable  
S117  
S118  
S119  
S120  
S121  
S122  
DT Between Room Air / FC Fluid  
Minimum CW Temp  
8ºF  
Disable  
45ºF  
0 - 36ºF  
Enable / Disable  
32 - 68ºF  
Minimum CW Temp Value  
Service Menu: Unit Diary Log  
Parameter  
Displays changes to the unit as performed and entered by  
the service person or customer  
68  
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Service Menu: Standby Setting / Lead-lag Parameters S500 series  
Menu Line  
S501  
Parameter  
Default  
Range  
-
Password  
-
S502  
Number of Standby Units  
Rotation Frequency  
0
0 – 15  
No, Daily, Every M,  
T, W, Th, F, S, Su  
S503  
No  
S504  
S505  
S506  
S507  
Rotate at (hour)  
Rotate at (minute)  
Rotate by  
0
0
1
-
0 – 23  
0 – 59  
1 – 8  
Perform one rotation  
No or Yes  
No, Yes, Cool,  
Temp  
S508  
Cascade units  
No  
No  
S509  
S510  
S511  
Start All Standby Units by HT  
No or Yes  
Service Menu: General Settings Maintenance / Wellness Parameters S000  
series: Page 1 of 8  
Menu Line  
Parameter  
Default  
Range  
S001  
Password  
-
-
0 – 12 per  
year  
S002  
Maintenance Frequency Per Year  
1
S003  
S004  
S005  
S006  
S007  
S008  
Max Bonus  
0
0
-
0 – 12  
0 – 12  
Date  
Max Penalty  
Last Maintenance  
Service Engineer  
Confirm PM  
-
Name  
-
No or Yes  
Date  
Calculated Next Maintenance  
-
69  
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Service Menu: Fan Settings Maintenance / Wellness Parameters: Page 2 of 8  
Menu Line  
S012  
Parameter  
Password  
Default  
Range  
-
-
-
S013  
Number of Starts  
Run Hours  
0 – 32000  
0 – 32000  
0 – 999 minutes  
1 – 240  
S014  
-
S015  
Average Working Time  
Starts per Day Optimum  
Starts per Day Worst  
Number of Alarms  
Actual Bonus  
-
S016  
1
24  
-
S017  
1 – 240  
S018  
0 – 32000  
0 - 12  
S019  
-
Service Menu: Compressor 1 Settings Maintenance / Wellness Parameters:  
Page 3 of 8  
Menu Line  
S023  
S024  
S025  
S026  
S027  
S028  
S029  
S030  
S031  
S032  
S033  
Parameter  
Password  
Default  
Range  
-
-
Number of Starts  
-
0 – 32000  
0 – 32000  
0 – 999 minutes  
1 – 240  
Run Hours  
-
Average Working Time  
Starts per Day Optimum  
Starts per Day Worst  
Number of HP Alarms  
Number of LP Alarms  
Number of OL Alarms  
Number of DS HT Alarms  
Actual Bonus  
-
12  
240  
1 – 240  
-
-
-
-
-
0 – 32000  
0 – 32000  
0 – 32000  
0 - 32000  
0 - 12  
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Service Menu: Compressor 2 Settings Maintenance / Wellness Parameters:  
Page 4 of 8  
Menu Line  
S034  
Parameter  
Password  
Default  
Range  
-
-
-
-
S035  
Number of Starts  
0 – 32000  
0 – 32000  
S036  
Run Hours  
S037  
S038  
S039  
S040  
S041  
S042  
S043  
S044  
Average Working Time  
Starts per Day Optimum  
Starts per Day Worst  
Number of HP Alarms  
Number of LP Alarms  
Number of OL Alarms  
Number of DS HT Alarms  
Actual Bonus  
-
0 – 999 minutes  
1 – 240  
12  
240  
1 – 240  
-
-
-
-
-
0 – 32000  
0 – 32000  
0 – 32000  
0 - 32000  
0 - 12  
Service Menu: Electric Heater 1 Settings Maintenance / Wellness  
Parameters: Page 5 of 8  
Menu Line  
S045  
Parameter  
Password  
Default  
Range  
-
-
S046  
Number of Starts  
Run Hours  
-
0 – 32000  
0 – 32000  
0 – 999 minutes  
1 – 240  
S047  
-
-
S048  
Average Run Time  
Starts per Day Optimum  
Starts per Day Worst  
Number of Alarms  
Actual Bonus  
S049  
24  
240  
-
S050  
1 – 240  
S051  
0 – 32000  
0 - 12  
S052  
-
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Service Menu: Electric Heater 2 Settings Maintenance / Wellness  
Parameters: Page 6 of 8  
Menu Line  
S056  
Parameter  
Password  
Default  
Range  
-
-
S057  
Number of Starts  
Run Hours  
-
0 – 32000  
0 – 32000  
0 – 999 minutes  
1 – 240  
S058  
-
-
S059  
Average Run Time  
Starts per Day Optimum  
Starts per Day Worst  
Number of Alarms  
Actual Bonus  
S060  
24  
240  
-
S061  
1 – 240  
S062  
0 – 32000  
0 - 12  
S063  
-
Service Menu: Electric Heater 3 Settings Maintenance / Wellness  
Parameters: Page 7 of 8  
Menu Line  
S067  
Parameter  
Password  
Default  
Range  
-
-
S068  
Number of Starts  
Run Hours  
-
0 – 32000  
0 – 32000  
0 – 999 minutes  
1 – 240  
S069  
-
-
S070  
Average Run Time  
Starts per Day Optimum  
Starts per Day Worst  
Number of Alarms  
Actual Bonus  
S071  
24  
240  
-
S072  
1 – 240  
S073  
0 – 32000  
0 - 12  
S074  
-
72  
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Service Menu: Humidifier Settings Maintenance / Wellness Parameters:  
Page 8 of 8  
Menu Line  
S078  
Parameter  
Password  
Default  
Range  
-
-
S079  
Number of Starts  
Run Hours  
-
0 – 32000  
0 – 32000  
0 – 999 minutes  
1 – 240  
S080  
-
-
S081  
Average Run Time  
Starts per Day Optimum  
Starts per Day Worst  
Number of Alarms  
Actual Bonus  
S082  
24  
240  
-
S083  
1 – 240  
S084  
0 – 32000  
0 - 12  
S085  
-
Service Menu: Diagnostics / Service Mode S300 series: Page 1 of 5  
Menu Line  
S301  
S302  
S303  
S304  
S305  
S306  
S307  
S308  
S309  
S310  
S311  
Parameter  
Password  
Range  
-
Manual Mode  
Yes or No  
Off or On  
Off or On  
Off or On  
0-100%  
Off or On  
Motor(s)  
Compressor 1  
Compressor 1 Capacity  
Compressor 1 Cycle Ramp  
Compressor 1 LLSV  
Compressor 2  
Compressor 2 Capacity  
Compressor 2 Cycle Ramp  
Compressor 2 LLSV  
Off or On  
0 – 100%  
73  
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Service Menu: Diagnostics / Service Mode: Page 2 of 5  
Menu Line  
S312  
S313  
S314  
S315  
S316  
S317  
S318  
S319  
S320  
S321  
S322  
Parameter  
Password  
Range  
-
HP 1 Alarm Counter  
HP 2 Alarm Counter  
HT 1 Alarm Counter  
HT 2 Alarm Counter  
0
0
0
0
Electric Heat 1(or HG/ HW)  
Heat 2 (or E.Heat 1)  
Off or On  
Off or On  
Off or On  
Heat 3 (or E.Heat 2)  
Service Menu: Diagnostics / Service Mode: Page 3 of 5  
Menu Line  
S323  
S324  
S325  
S326  
S327  
S328  
S329  
S330  
S331  
S332  
S333  
Parameter  
Password  
Range  
-
Humidifier Fill  
Humidifier  
Off or On  
Off or On  
Off or On  
Off or On  
Off or On  
Off or On  
0 – 100%  
0 – 100%  
0 – 100%  
0 – 100%  
Alarm Relay  
FC Relay  
3P Actuator Open  
3P Actuator Close  
Analog Out 1  
Analog Out 2  
Analog Out 3  
Analog Out 4  
74  
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Service Menu: Diagnostics / Service Mode: Page 4 of 5  
Menu Line  
S334  
Parameter  
Password  
Range  
-
S335  
Status Remote Shutdown  
Status Airflow Loss  
Off or On  
S336  
OK or Active  
OK or Active  
OK or Active  
OK or Active  
OK or Active  
OK or Active  
OK or Active  
S337  
Status Motor Overload  
Status Filter  
S338  
S339  
Status Customer Input 1  
Status Customer Input 2  
Status Customer Input 3  
Status Customer Input 4  
S340  
S341  
S342  
Service Menu: Diagnostics / Service Mode: Page 5 of 5  
Menu Line  
S345  
S346  
S347  
S348  
S349  
S350  
S351  
S352  
S353  
S354  
S355  
Parameter  
Password  
Range  
-
Status HP1  
OK or Active  
OK or Active  
OK or Active  
OK or Active  
OK or Active  
OK or Active  
OK or Active  
Off or On  
Status LP1  
Status C1 OL  
Status HP2  
Status LP2  
Status C2 OL  
Status Humidifier Problem  
Status DT2  
Status Min CW  
Off or On  
75  
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Service Menu: Set Alarm Parameters S200 series: Page 1 of 6  
Menu Line  
S201  
S202  
S203  
S204  
S205  
S206  
S207  
S208  
S209  
S210  
S211  
Parameter  
Password  
Default  
-
Range  
-
Return Sensor Alarms  
High Return Temperature  
Low Return Temperature  
High Return Humidity  
Low Return Humidity  
Enabled  
80ºF  
Disabled or Enabled  
34 - 210ºF  
34 - 210ºF  
1 – 99%  
65ºF  
60%  
40%  
1 – 99%  
Sensor A Alarms  
Disabled  
90ºF  
Disabled or Enabled  
34 - 210ºF  
34 - 210ºF  
1 – 99%  
High Temperature Sensor A  
Low Temperature Sensor A  
High Humidity Sensor A  
Low Humidity Sensor A  
55ºF  
70%  
30%  
1 – 99%  
Service Menu: Set Alarm Parameters: Page 2 of 6  
Menu Line  
S212  
S213  
S214  
S215  
S216  
S217  
S218  
S219  
S220  
S221  
S222  
Parameter  
Default  
Range  
Password  
-
-
Customer Input 1  
Water alarm  
Closed  
See note  
Open or Closed  
See note  
Customer Input 1 Active When  
Customer Input 2  
Water alarm  
Closed  
Customer Input 2 Active When  
Customer Input 3  
Open or Closed  
See note  
Water alarm  
Closed  
Customer Input 3 Active When  
Customer Input 4  
Open or Closed  
See note  
Water alarm  
Closed  
Customer Input 4 Active When  
Warning Activates Alarm Relay  
Reset Disabled Alarms  
Open or Closed  
Yes or No  
Yes  
No  
Yes or No  
Note: Customer Inputs 1, 2, 3 and 4 messages may be selected from Smoke  
Detected, Water Alarm, Condensate Pump Alarm, Flow Alarm, Standby Pump,  
Standby Unit.  
76  
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Service Menu: Set Alarm Parameters: Page 3 of 6  
Parameter  
Password  
Menu Line  
S223  
S224  
S225  
S226  
S227  
S228  
S229  
S230  
S231  
S232  
S233  
S234  
S235  
DELAY  
10 Sec  
10 Sec  
60 Sec  
10 Sec  
10 Sec  
10 Sec  
10 Sec  
10 Sec  
10 Sec  
10 Sec  
10 Sec  
EN-DIS  
En  
TYPE  
Main Fan Overload  
Loss of Airflow  
Alarm  
En  
Alarm  
Clogged Filters  
En  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
High Room Temperature  
Low Room Temperature  
High Room Humidity  
Low Room Humidity  
High Temp Sensor A  
Low Temp Sensor A  
High Humid Sensor A  
Low Humid Sensor A  
En  
En  
En  
En  
En  
En  
En  
En  
Service Menu: Set Alarm Parameters: Page 4 of 6  
Parameter  
Password  
Menu Line  
S236  
S237  
S238  
S239  
S240  
S241  
S242  
S243  
S244  
S245  
S246  
S247  
DELAY  
EN-DIS  
En  
TYPE  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Comp 1 Overload  
10 Sec  
Comp 2 Overload  
10 Sec  
En  
Comp 1 High Pressure  
Comp 1 High Pressure  
Comp 1 Low Pressure  
Comp 2 Low Pressure  
Comp 1 Pumpdown Fail  
Comp 2 Pumpdown Fail  
Dig Scroll1 High Temp  
Dig Scroll2 High Temp  
-
-
-
-
-
-
-
En  
En  
En  
En  
En  
En  
En  
77  
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Service Menu: Set Alarm Parameters: Page 5 of 6  
Menu Line  
S249  
S250  
S251  
S252  
S253  
S254  
S255  
S256  
S257  
S258  
S259  
S260  
Parameter  
Password  
DELAY  
-
EN-DIS  
En  
TYPE  
Warning  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Working Hours Exceeded  
Smoke Detected  
5 Sec  
5 Sec  
5 Sec  
5 Sec  
5 Sec  
5 Sec  
5 Sec  
-
En  
Water Under Floor  
Cond Pump-High Water  
Loss of Flow  
En  
En  
En  
Standby Glycol Pump On  
Standby Unit On  
En  
En  
Humidifier Problem  
No Connection w/ Unit 1  
Unit X Disconnected  
En  
En  
-
En  
Service Menu: Set Alarm Parameters: Page 6 of 6  
Parameter  
Menu Line  
S262  
S263  
S264  
S265  
S266  
S267  
S268  
S269  
S270  
S271  
S272  
S273  
S274  
Password  
DELAY  
5 Sec  
5 Sec  
5 Sec  
5 Sec  
5 Sec  
5 Sec  
5 Sec  
5 Sec  
5 Sec  
5 Sec  
5 Sec  
EN-DIS  
En  
TYPE  
Alarm  
Customer Input 1  
Customer Input 2  
Customer Input 3  
Customer Input 4  
Call Service  
En  
Alarm  
En  
Alarm  
En  
Alarm  
En  
Message  
Message  
Alarm  
High Temperature  
Loss of Air Blower 1  
Reheat Lockout  
En  
En  
En  
Message  
Message  
Message  
Message  
Humidifier Lockout  
Humid + Reheat Lockout  
Compressor(s) Lockout  
En  
En  
En  
78  
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Service Menu: Sensor Calibration/ Setup Parameters S600 series:  
Page 1 of 3  
Menu Line  
Parameter  
Range  
-
S601  
S602  
S603  
S604  
S605  
S606  
S607  
S608  
S609  
Password  
Return temperature  
±17ºF  
Calibrated return temperature  
Return humidity  
32 - 122ºF  
±9.9%  
Calibrated return humidity  
Digital Scroll 1 NTC  
20 – 80%  
±17ºF  
Calibrated digital scroll 1 NTC  
Digital Scroll 2 NTC  
84 – 313ºF  
±17ºF  
Calibrated digital scroll 2 NTC  
84 - 313ºF  
Service Menu: Sensor Calibration/ Setup Parameters: Page 2 of 3  
Menu Line  
S612  
Parameter  
Range  
-
Password  
S613  
Temperature sensor A  
±17ºF  
S614  
Calibrated temperature sensor A  
Humidity sensor A  
32 - 122ºF  
±9.9%  
S615  
S616  
Calibrated humidity sensor A  
Temperature sensor B  
20 – 80%  
±17ºF  
S617  
S618  
Calibrated temperature sensor B  
Humidity sensor B  
32 - 122ºF  
±9.9%  
S619  
S620  
Calibrated humidity sensor B  
20 – 80%  
79  
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Service Menu: Sensor Calibration/ Setup Parameters: Page 3 of 3  
Menu Line  
S623  
S624  
S625  
S626  
S627  
S628  
S629  
S630  
S631  
S632  
S633  
Parameter  
Default  
Range  
-
Password  
Glycol sensor PTC or NTC  
Glycol sensor  
NTC  
NTC or PTC  
±17ºF  
-
Calibrated glycol sensor  
Supply sensor PTC or NTC  
Supply sensor  
-
4 – 113ºF  
NTC or PTC  
±17ºF  
NTC  
-
-
-
-
-
-
Calibrated supply sensor  
Temperature sensor C  
Calibrated temperature sensor C  
Humidity sensor C  
32 - 122ºF  
±17ºF  
32 - 122ºF  
±9.9%  
Calibrated humidity sensor C  
20 – 80%  
Service Menu: System / Network Setup Parameters Series S800:  
Page 1 of 2, System View  
Menu Line  
S801  
S802  
S803  
S804  
S805  
S806  
S807  
S808  
S809  
S810  
S811  
Function  
Password  
Default  
Range  
-
-
-
Number of connected units  
Teamwork mode  
1 – 16  
No, 1, 2  
No  
U2U group  
-
1 - 99  
Configuration Safe Status  
Network Safe Status  
SW version:  
No  
No, Save, Load  
No, Save, Load  
-
-
80  
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Service Menu: System / Network Setup Parameters Series S800:  
Page 2 of 2, System View  
Menu Line  
Function  
Default  
Range  
S812  
S813  
S814  
S815  
S816  
S817  
S818  
S819  
S820  
S821  
S822  
Password  
IP Address  
Netmask  
Gateway  
MAC  
-
-
-
-
-
-
-
-
-
-
-
-
IP Address  
Netmask Range  
Gateway Range  
MAC Range  
-
U2U Protocol  
U2U Address  
33 - 64  
-
Bootloader Variables Status  
Bootloader Variables Control  
Changed, Updating  
No, Save + Reboot  
Service Menu: System / Network Setup Parameters Series S800:  
Page 1 of 2, Unit View  
Menu Line  
S823  
S824  
S825  
S826  
S827  
S828  
S829  
S830  
S831  
S832  
S833  
Function  
Password  
Default  
Range  
-
Monitoring Address  
3
U2U Group  
Unit Name  
1 – 99  
Unit  
6 Digits  
Configuration Safe Status  
Network Safe Status  
SW version:  
No  
No  
-
No, Save, Load  
No, Save, Load  
81  
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Service Menu: System / Network Setup Parameters Series S800:  
Page 2 of 2, Unit View  
Menu Line  
S834  
S835  
S836  
S837  
S838  
S839  
S840  
S841  
S842  
S843  
S844  
Function  
Default  
Range  
Password  
-
-
-
-
-
-
-
-
-
-
-
Monitoring Protocol  
IP Address  
Netmask  
-
IP Range  
Netmask Range  
Gateway Range  
MAC Range  
33 - 64  
Gateway  
MAC  
U2U Protocol  
U2U Address  
-
Bootloader Variables Status  
Bootloader Variables Control  
Changed, Updating  
No, Save + Reboot  
Service Menu: Option Setup Parameters S400 series: Page 1 of 2  
Menu Line  
S401  
S402  
S403  
S404  
S405  
S406  
S407  
S408  
S409  
S410  
S411  
Function  
Password  
Default  
Range  
-
-
Compressor Sequence  
Low Pressure Delay (WSK)  
Actual LP1 Pressure  
Actual LP2 Pressure  
Electric Stages  
Auto  
1, 2, Auto  
3
0 – 5 Minutes  
14.5 – 87.0 psiA  
14.5 – 87.0 psiA  
0, 1, 2, 3  
-
-
-
No  
Hot Water Heat On / Off  
Hot Gas Heat  
No or Yes  
No  
No, Comp. 1, Comp. 2  
0, 1, 2, 3l  
Total Heat Stages  
No  
3P Actuator Runtime  
3P Actuator Direction  
165 Seconds  
Direct  
50 – 400 seconds  
Direct or Reverse  
82  
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Service Menu: Option Setup Parameters S400 series:: Page 2 of 2  
Menu Line  
S412  
S413  
S414  
S415  
S416  
S417  
S418  
S419  
S420  
S421  
S422  
Function  
Password  
Default  
-
Range  
-
Humidification Enabled  
Infrared Flush Rate  
Yes  
Yes or No  
150%  
Yes  
110 – 500%  
No or Yes  
Dehumidification Enabled  
Electric Reheat Operation  
Single Unit Auto Restart  
On – Off Enabled  
No  
No, Normal, Delayed  
0 – 999 seconds  
Yes or No  
5 Seconds  
Yes  
CW Flush  
No  
No  
No  
No, 1 – 99 Hours  
No, 1 – 99 Hours  
No, 1 – 99 Hours  
Freecooling Flush  
Hot Water Flush  
Service Menu: Service Contacts Parameters S700 series:  
Menu Line  
S701  
Function  
Password  
Default  
Range  
-
-
S702  
Country  
USA  
None, United States  
Text-string  
Text-string  
Text-string  
Text-string  
S703  
Address line 1  
Address line 2  
Address line 3  
Address line 4  
-
-
-
-
S704  
S705  
S706  
83  
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Advanced Menu Parameters  
The Advanced menu displays allows the service technician to set the unit  
configuration code and to customize the various unit settings for site-specific  
operation. The factory default password to access the advanced menu items for  
programming is “221”. The Advance Menu selections include the following  
choices in the order shown:  
Factory Settings  
Access Levels  
Advanced Menu: Factory Settings Parameters A001 series: Page 1 of 6  
Menu Code  
A001  
Parameter  
Password  
Range  
-
A002  
Unit field code (R)  
Set code (W)  
(01 – 06)  
(01 – 06)  
(07 – 12)  
(07 – 12)  
(13 – 18)  
(13 – 18)  
A003  
A004  
Unit field code (R)  
Set code (W)  
A005  
A006  
Unit field code (R)  
Set code (W)  
A007  
No  
A008  
Unit Code Control  
Load+Execute  
Save+Execute  
No  
A009  
A010  
A011  
Unit Code Status  
Load+Execute  
Save+Execute  
Exception List Control  
Exception List Status  
No, Load  
No  
Load+Execute  
Save+Execute  
84  
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Advanced Menu: Factory Settings Parameters A100 series: Page 2 of 6  
Menu Code  
A101  
Function  
Password  
Default  
Range  
-
-
A102  
Refrigerant Type  
R22  
R22, R407C  
A103  
A104  
Main Fan Overload  
Shut down  
Shut down  
Shut down, Disable  
Shut down, Disable  
Loss of Airflow  
A105  
A106  
Number of Compressors  
Compressor Delay Time  
2
0
0, 1, 2  
0 - 120 Sec  
Compressor Minimum  
On Time  
A107  
3 Min  
0 - 5 Min  
Compressor Minimum  
Off Time  
A108  
A109  
A110  
3 Min  
Yes  
0 - 5 Min  
No, Yes  
Pump Down  
No, Unloader, HGBP,  
Digital, Digital + TH  
Capacity Control Type  
Unloader  
Advanced Menu: Factory Settings Parameters A100 series: Page 3 of 6  
Menu Code  
A112  
Parameter  
Password  
Default  
Range  
-
-
A113  
Digi Scroll Cycle  
15  
No, 10 - 30 Sec  
High Temperature Digi  
Scroll  
A114  
A115  
A116  
268°F  
250°F  
Analog  
33 - 392°F  
33 - 392°F  
Digi Scroll Switchback  
Low Pressure Device  
Type  
Analog, Switch  
Low Pressure Threshold  
Phase 1  
A117  
A118  
* See Note 1  
* See Note 2  
0.0 - 145 psiA  
0.0 - 145 psiA  
Low Pressure Threshold  
Phase 2  
85  
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Advanced Menu: Factory Settings Parameters: Page 4 of 6  
Menu Code  
A123  
Parameter  
Password  
Default  
-
Range  
-
A124  
LP1 Sensor  
10%  
0 - 100%  
A125  
LP1 Signal  
150 psiA  
-
-87.0 to +725 psiA  
0 - 100%  
A126  
Actual LP1 Signal  
LP2 Sensor  
A127  
10%  
0 - 100%  
A128  
LP2 Signal  
150 psiA  
-
-87.0 to +725 psiA  
0 - 100%  
A129  
Actual LP2 Signal  
Pumpdown Cutout  
Pumpdown Recycle  
A130  
35 psiA  
80 psiA  
0.0 - 145 psiA  
0.0 - 145 psiA  
A131  
Heat Rejection Control  
Type  
Fan Speed /  
Lee-Temp / Glycol  
A132  
Fan Speed  
Advanced Menu: Factory Settings Parameters A100 series: Page 5 of 6  
Menu Code  
A134  
Parameter  
Password  
Default  
Range  
-
-
A135  
A136  
CW flush Duration  
Freecooling  
0
No, 1 - 3 min  
No, Yes  
A137  
No  
A138  
A139  
Freecooling Flush Duration  
Freecooling Flush Starts R5  
CO + FC simultaneously  
0
No, 1 - 3 min  
No, Yes  
A140  
Yes  
Yes  
A141  
No, Yes  
A142  
A143  
Hot water flush duration  
0
No, 1 - 3 min  
86  
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Advanced Menu: Factory Settings Parameters: Page 6 of 6  
Menu Code  
A145  
Parameter  
Password  
Default  
Range  
-
-
A146  
Humidifier Model  
No  
No, external, IFS, IFL  
Humidity in Last  
xx Hours  
A147  
A148  
A149  
A150  
A151  
15hr  
1 - 120 hours  
1 - 120 seconds  
1 - 120 seconds  
1 - 60 minutes  
1, 2, both  
IFS 30  
IFL 60  
Prefill Time  
Fill Time  
IFS 30  
IFL 50  
Humidifier On  
Time  
IFS 8  
IFL 10  
Dehum with  
Compressor  
2
A152  
A153  
A154  
A155  
Analog Output 1  
Analog Output 2  
Analog Output 3  
Analog Output 4  
Not used  
Not used  
Not used  
Not used  
* See note 3  
*See note 3  
* See note 3  
* See note 3  
Note 1: LP threshold Phase 1 (A117):  
If condenser ctrl (A132) = fan speed then setting is 50 psiA ; otherwise 75 psiA.  
If the condenser control setting changes, the setting for A117 will be updated  
automatically. If any of the sources (Refrigerant, Freecooling, Hotwater) changes,  
the setting for A118 will be updated automatically.  
Note 2: LP threshold Phase 1 (A118):  
R22 (A102) + NO FC (A137) + NO Hotwater (S408) = 63 psiA  
R22 (A102) + YES FC (A137) + NO Hotwater (S408) = 68 psiA  
R22 (A102) + NO FC (A137) + YES Hotwater (S408) = 75 psiA  
R22 (A102) + YES FC (A137) + YES Hotwater (S408) = 75 psiA  
R407c (A102) + NO FC (A137) + NO Hotwater (S408) = 70 psiA  
R407c (A102) + YES FC (A137) + NO Hotwater (S408) = 75 psiA  
R407c (A102) + NO FC (A137) + YES Hotwater (S408) = 83 psiA  
R407c (A102) + YES FC (A137) + YES Hotwater (S408) = 83 psiA  
Note 3: The following components may be controlled with the Analog Outputs and  
labeled as: Hot Water Reheat, 3P Valve, Fan Speed, Cooling, Cooling 1, Cooling  
2, Heating and Not Used.  
87  
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Advanced Menu: Factory Access Parameters A200 series:  
Menu Code  
A201  
Parameter  
Default Range  
Password Level 1 (User)  
Password Level 2 (Service)  
Password Level 3 (Advanced)  
149  
501  
221  
4 digits  
4 digits  
4 digits  
A202  
A203  
88  
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Events Notifications Parameters  
ID  
000  
001  
002  
003  
004  
005  
006  
007  
008  
009-017  
018  
019  
020  
021  
022  
023  
024  
025  
026  
027  
028  
029  
030  
031  
032  
033  
034  
035  
036  
Type  
Alarm  
Description (Large Display)  
GENERAL ALARM  
Description (Small Display)  
GENERAL ALARM  
Alarm  
COMP. 1 HIGH PRESSURE  
COMP. 1 LOW PRESSURE  
HIGH CHILLED WATER  
LOW CHILLED WATER FLOW  
EL. HEAT. OVERHEATED  
MAIN FAN OVERLOAD  
LOSS OF AIRFLOW  
COMP. 1 HIGH PRESSURE  
COMP. 1 LOW PRESSURE  
HIGH CHILLED WATER  
LOW WATER FLOW  
EL. HEAT. OVERHEATED  
MAIN FAN OVERLOAD  
LOSS OF AIRFLOW  
CLOGGED FILTERS  
Future  
Alarm  
Warning  
Warning  
Warning  
Alarm  
Alarm  
Warning  
Future  
CLOGGED FILTERS  
Future  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Future  
HIGH ROOM TEMPERATURE  
LOW ROOM TEMPERATURE  
HIGH ROOM HUMIDITY  
LOW ROOM HUMIDITY  
HIGH ROOM TEMPERATURE  
LOW ROOM TEMPERATURE  
HIGH ROOM HUMIDITY  
LOW ROOM HUMIDITY  
UNIT HOURS EXCEEDED  
C1 HOURS EXCEEDED  
HUMIDIFIER HOURS EXCEEDED  
SUPPLY SENSOR FAILURE  
Future  
HIGH ROOM TEMPERATURE  
LOW ROOM TEMPERATURE  
HIGH ROOM HUMIDITY  
LOW ROOM HUMIDITY  
HIGH ROOM TEMPERATURE  
LOW ROOM TEMPERATURE  
HIGH ROOM HUMIDITY  
LOW ROOM HUMIDITY  
UNIT HOURS EXCEEDED  
C1 HOURS EXCEEDED  
HUM. HOURS EXCEEDED  
SUPPLY SENSOR FAILURE  
Future  
Alarm  
ROOM SENSOR FAILURE  
SENSOR "A" FAILURE  
Future  
ROOM SENSOR FAILURE  
SENSOR "A" FAILURE  
Future  
Warning  
Future  
Warning  
Future  
NETWORK FAILURE  
Future  
NETWORK FAILURE  
Future  
Message  
UNIT ON  
UNIT ON  
89  
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Events Notifications Parameters (continued)  
ID  
037  
038  
039  
040  
041  
042  
043  
044  
045  
046  
047  
048  
049  
050  
051  
052  
053  
054  
055  
056  
057  
058  
059  
060  
061  
062  
063  
064  
065-069  
Type  
Description (Large Display)  
UNIT OFF  
Description (Small Display)  
UNIT OFF  
Message  
Message  
Message  
Message  
Message  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Alarm  
SLEEP MODE  
SLEEP MODE  
STANDBY MODE  
POWER ON UNIT LOGIN  
POWER OFF  
STANDBY MODE  
POWER ON UNIT LOGIN  
POWER OFF  
Unit 1 disconnected  
Unit 2 disconnected  
Unit 3 disconnected  
Unit 4 disconnected  
Unit 5 disconnected  
Unit 6 disconnected  
Unit 7 disconnected  
Unit 8 disconnected  
Unit 9 disconnected  
Unit 10 disconnected  
Unit 11 disconnected  
Unit 12 disconnected  
Unit 13 disconnected  
Unit 14 disconnected  
Unit 15 disconnected  
Unit 16 disconnected  
COMP. 2 HIGH PRESSURE  
COMP. 2 LOW PRESSURE  
C2 HOURS EXCEEDED  
Future  
Unit 1 disconnected  
Unit 2 disconnected  
Unit 3 disconnected  
Unit 4 disconnected  
Unit 5 disconnected  
Unit 6 disconnected  
Unit 7disconnected  
Unit 8 disconnected  
Unit 9 disconnected  
Unit 10 disconnected  
Unit 11 disconnected  
Unit 12 disconnected  
Unit 13 disconnected  
Unit 14 disconnected  
Unit 15 disconnected  
Unit 16 disconnected  
COMP. 2 HIGH PRESSURE  
COMP. 2 LOW PRESSURE  
C2 HOURS EXCEEDED  
Future  
Alarm  
Warning  
Future  
Warning  
Future  
GLYCOL TEMP. SENSOR  
Future  
GLYCOL TEMP. SENSOR  
Future  
Warning  
Future  
ON-OFF KEY DISABLED  
Future  
ON-OFF KEY DISABLED  
Future  
90  
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Events Notifications Parameters (continued)  
ID  
070  
Type  
Warning  
Alarm  
Description (Large Display)  
NO CONNECTION TO UNIT 1  
C1 MOTOR PROTECTION  
C2 MOTOR PROTECTION  
Future  
Description (Small Display)  
NO CONN. TO UNIT 1  
C1 MOTOR PROTECTION  
C2 MOTOR PROTECTION  
Future  
071  
072  
Alarm  
073-078  
079  
Future  
Message  
Message  
Future  
Message  
Warning  
Future  
Message  
Warning  
Future  
Alarm  
UNIT DISABLED  
UNIT DISABLED  
080  
UNIT SHUT DOWN  
Future  
UNIT SHUT DOWN  
Future  
081-084  
085  
UNIT SYNCHRONISATION  
HUMIDIFIER PROBLEM  
Future  
UNIT SYNCHRONISATION  
HUMIDIFIER PROBLEM  
Future  
086  
087  
088  
DEHUM HOURS EXCEEDED  
FC. HOURS EXCEEDED  
Future  
DEHUM HOURS EXCEEDED  
FC. HOURS EXCEEDED  
Future  
089  
090  
091  
PUMP DOWN FAILURE C1  
Future  
PUMP DOWN FAILURE C1  
Future  
092-095  
096  
Future  
Alarm  
PUMP DOWN FAILURE C2  
DIGISCROLL 1 HIGH TEMP.  
DIGISCROLL 2 HIGH TEMP.  
Future  
PUMP DOWN FAILURE C2  
D.SCROLL 1 HIGH TEMP.  
D.SCROLL 2 HIGH TEMP.  
Future  
097  
Alarm  
098  
Alarm  
099 102  
103  
Future  
Message  
Alarm  
SHORT CYCLING  
SHORT CYCLING  
104  
SMOKE DETECTED  
WATER UNDER FLOOR  
COND. PUMP-HIGH WATER  
LOSS OF FLOW  
SMOKE DETECTED  
WATER UNDER FLOOR  
COND. PUMP-HIGH WATER  
LOSS OF FLOW  
105  
Alarm  
106  
Alarm  
107  
Alarm  
108  
Alarm  
STANDBY GLYCOL PUMP ON  
STANDBY UNIT ON  
HW/HG HOURS EXCEEDED  
STBY GLYCOL PUMP ON  
STANDBY UNIT ON  
HW/HG WORKING HOURS  
109  
Alarm  
110  
Warning  
91  
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Events Notifications Parameters (continued)  
ID  
Type  
Description (Large Display) Description (Small Display)  
EL.HEAT 1 HOURS  
EL.HEAT 1 HOURS EXC.  
EXCEEDED  
111  
Warning  
EL.HEAT 2 HOURS  
EL.HEAT 2 HOURS EXC.  
EXCEEDED  
112  
113  
Warning  
Warning  
EL.HEAT 3 HOURS  
EL.HEAT 3 HOURS EXC.  
EXCEEDED  
Event ID number, Description and Function  
ID Description  
Event explanation  
Default Shut Rotat restart if  
Type  
down  
e
duty unit  
single stand fails also  
unit  
by  
000 GENERAL  
ALARM  
001 COMP 1 HIGH Compressor 1 stopped  
PRESSURE because of high pressure  
Warning or Alarm was  
acknowledged or reset  
Reset  
Alarm  
-
-
-
no  
no  
no  
yes  
yes  
no  
yes  
(broken co  
will remain  
off)  
002 COMP 1 LOW Compressor 1 stopped  
Alarm  
yes  
PRESSURE  
because of low pressure  
(broken co  
will remain  
off)  
003 HIGH CW  
TEMP  
chilled water temperature Warning  
too high (input from  
-
thermostat)  
004 LOSS OF CW chilled water flow too low Warning  
FLOW (input from flow switch)  
005 EL HEAT HIGH electric heaters stopped Warning  
no  
no  
no  
no  
-
-
TEMP  
because of too high  
temperature on the  
safety thermostat  
006 MAIN FAN  
OVERLOAD  
fan motor protection has Alarm  
stopped the fan due to  
overload.  
yes, if yes  
set to  
shut  
yes, only if  
set to  
"disable"  
this event can be set to  
switch off the unit or to  
disable hum and electric  
heat.  
down  
92  
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007 LOSS OF  
AIRFLOW  
not enough airflow  
through the unit.  
Alarm  
yes, if yes  
set to  
yes, only if  
set to  
this event can be set to  
switch off the unit or to  
disable hum and electric  
heat.  
shut  
down  
"disable"  
008 CLOGGED  
FILTERS  
018 HIGH ROOM actual return air  
air filters are dirty  
Warning  
Warning  
no  
no  
no  
no  
-
-
TEMP  
temperature (value from  
std. sensor) is higher  
than the threshold  
actual return air  
temperature (value from  
std. sensor) is lower than  
the threshold  
019 LOW ROOM  
TEMP  
Warning  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
-
-
-
-
-
-
-
020 HIGH ROOM actual return air humidity Warning  
HUM  
(value from std. sensor)  
is higher than the  
threshold  
actual return air humidity Warning  
(value from std. sensor)  
is lower than the  
021 LOW ROOM  
HUM  
threshold  
022 HIGH TEMP  
SENSOR A  
actual temperature  
(value from optional  
sensor A) is higher than  
the threshold  
actual temperature  
(value from optional  
sensor A) is lower than  
the threshold  
actual humidity (value  
from optional sensor A)  
is higher than the  
threshold  
actual humidity (value  
from optional sensor A)  
is lower than the  
Warning  
Warning  
Warning  
Warning  
023 LOW TEMP  
SENSOR A  
024 HIGH HUM  
SENSOR A  
025 LOW HUM  
SENSOR A  
threshold  
026 UNIT HRS  
EXCEEDED  
actual working hours of Warning  
the fan are higher than  
the threshold set.  
no  
no  
no  
no  
-
-
027 COMP 1 HRS actual working hours of Warning  
EXCEEDED  
compressor 1 are higher  
than the threshold set.  
93  
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028 HUM HRS  
EXCEEDED  
actual working hours of Warning  
the fan are higher than  
the threshold set.  
no  
no  
no  
no  
-
-
029 SUPPLY  
SENSOR  
sensor faulty or not  
present, but needed from  
control (supply limit  
control enabled).  
Warning  
FAILURE  
031 ROOM  
SENSOR  
no valid data from the  
std. sensor  
Alarm  
yes  
yes  
no  
FAILURE  
032 SENSOR A  
FAILURE  
034 NETWORK  
FAILURE  
no valid data from sensor Warning  
A
no  
no  
no  
no  
-
-
the unit showing this  
event has no connection  
to the unit #1.  
Warning  
036 UNIT ON  
037 UNIT OFF  
038 SLEEP MODE unit is in sleep mode:  
according to the settings  
it is switched off or  
fan motor in operation  
unit shut down  
Message  
Message  
Message  
-
-
-
-
-
-
-
-
-
working with a selectable  
deadband.  
039 STANDBY  
MODE  
unit is in standby (fan  
off), waiting for a call to  
start from the system (if  
a unit fails or there is a  
bus interruption).  
Message  
-
-
-
040 POWER ON  
control is powered again Message  
after a power off.  
-
-
-
-
-
-
041 POWER OFF no power to the control: Message  
this message will appear  
at the next power on.  
042 Unit 1  
this event is created from Warning  
no  
no  
-
disconnected a coldfire display only:  
the display doesn't find  
unit #1  
043 Unit 2  
"
Warning  
Warning  
Warning  
Warning  
Warning  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
-
-
-
-
-
disconnected  
044 Unit 3  
disconnected  
045 Unit 4  
disconnected  
046 Unit 5  
disconnected  
047 Unit 6  
disconnected  
"
"
"
"
94  
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048 Unit 7  
disconnected  
049 Unit 8  
disconnected  
050 Unit 9  
disconnected  
051 Unit 10  
disconnected  
052 Unit 11  
disconnected  
053 Unit 12  
disconnected  
054 Unit 13  
disconnected  
055 Unit 14  
disconnected  
056 Unit 15  
disconnected  
057 Unit 16  
disconnected  
058 COMP 2 HIGH Compressor 2 stopped  
PRESSURE because of high pressure  
"
"
"
"
"
"
"
"
"
"
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Warning  
Alarm  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
yes  
-
-
-
-
-
-
-
-
-
-
yes  
(broken co  
will remain  
off)  
059 COMP 2 LOW Compressor 2 stopped  
PRESSURE because of low pressure  
Alarm  
no  
yes  
yes  
(broken co  
will remain  
off)  
060 COMP 2 HRS actual working hours of Warning  
no  
no  
no  
no  
-
EXCEEDED  
compressor 2 are higher  
than the threshold set.  
sensor faulty or not  
present, but needed from  
control (freecooling  
062 FREECOOL  
TEMP  
Warning  
-
SENSOR  
control enabled).  
064 ON-OFF KEY the display on-off button Warning  
no  
no  
no  
no  
no  
-
-
DISABLED  
was set disabled but  
somebody pressed it.  
the unit showing this  
070 NO  
Warning  
Alarm  
CONNECTION event has no connection  
w/Unit1  
to the unit #1.  
071 COMP 1  
Compressor 1 stopped  
because of overload  
yes  
yes  
OVERLOAD  
(broken co  
will remain  
off)  
95  
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072 COMP 2  
OVERLOAD  
Compressor 2 stopped  
because of overload  
Alarm  
no  
yes  
-
yes  
(broken co  
will remain  
off)  
079 UNIT  
DISABLED  
this message appears  
after a critical alarm  
(airflow, main fan  
Message  
-
overload) and indicates  
that the unit is operating  
w/o humidifier or  
electrical heaters.  
080 UNIT SHUT  
DOWN  
this message appears  
after a critical alarm  
(airflow, main fan  
overload) and indicates  
that the unit is shut down  
due to the alarm.  
Message  
-
-
-
085 UNIT  
a unit came back into the Message  
-
-
SYNCHRONIS network.  
ATION  
086 HUMIDIFIER humidifier  
PROBLEM overtemperature or high  
water level  
088 DEHUM HRS actual working hours of Warning  
Alarm  
no  
no  
yes  
no  
EXCEEDED  
dehumidification are  
higher than the threshold  
set.  
089 FC HRS  
EXCEEDED  
actual working hours of Warning  
freecooling are higher  
than the threshold set.  
no  
no  
no  
-
091 COMP 1  
Pump down of circuit 1  
Alarm  
yes  
yes  
(broken co  
will remain  
off)  
PUMPDOWN was not completed  
FAIL  
(pressure value not  
reached).  
096 COMP 2  
Pump down of circuit 2  
Alarm  
no  
no  
yes  
yes  
yes  
PUMPDOWN was not completed  
FAIL  
(broken co  
will remain  
off)  
(pressure value not  
reached).  
097 DIG SCROLL1 Digital Scroll compressor Alarm  
yes  
HIGH TEMP  
#1 shut off because of  
high temperature (sensor  
is inside the  
(broken co  
will remain  
off)  
compressor).  
96  
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098 DIG SCROLL2 Digital Scroll compressor Alarm  
no  
yes  
yes  
HIGH TEMP  
#1 shut off because of  
high temperature (sensor  
is inside the  
(broken co  
will remain  
off)  
compressor).  
103 SHORT CYCLEcompressors are  
requested from control to  
Message  
Alarm  
-
no  
-
start too often - control is  
unstable.  
104 SMOKE  
DETECTED  
customer input is active.  
no  
yes  
yes (if not  
disabled  
externally)  
105 WATER  
UNDER  
customer input is active.  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
no  
no  
no  
no  
no  
no  
yes  
yes  
yes  
yes  
yes  
no  
yes (if not  
disabled  
externally)  
yes (if not  
disabled  
externally)  
yes (if not  
disabled  
externally)  
yes (if not  
disabled  
externally)  
yes (if not  
disabled  
externally)  
-
FLOOR  
106 COND PUMP- customer input is active.  
HIGH WATER  
107 LOSS OF  
FLOW  
customer input is active.  
108 STBY GLYCOL customer input is active.  
PUMP ON  
109 STANDBY  
UNIT ON  
customer input is active.  
110 HW/HG HRS actual working hours of Warning  
EXCEEDED  
hot water heat / hot gas  
reheat are higher than  
the threshold set.  
111 EL HEAT1 HRSactual working hours of Warning  
no  
no  
no  
no  
no  
no  
-
-
-
EXCEEDED  
electrical heater stage 1  
are higher than the  
threshold set.  
112 EL HEAT2 HRSactual working hours of Warning  
EXCEEDED  
electrical heater stage 2  
are higher than the  
threshold set.  
113 EL HEAT3 HRSactual working hours of Warning  
EXCEEDED  
electrical heater stage 3  
are higher than the  
threshold set.  
97  
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114 UNIT CODE  
MISSING  
this alarm appears if a  
totally new board was  
started the very first time  
in its life. the unit code  
must be set in order to  
let the board know in  
which type of unit it is  
mounted, which  
Alarm  
yes  
yes  
no  
component it shall drive  
and how to map the  
inputs and outputs.  
115 UNIT CODE 01 this digit of the unit code Alarm  
yes  
yes  
no  
MISMATCH  
has been set to a value  
out of range (no code  
logic available for this  
number)  
116 UNIT CODE 02 "  
MISMATCH  
117 UNIT CODE 03 "  
MISMATCH  
118 UNIT CODE 04 "  
MISMATCH  
119 UNIT CODE 05 "  
MISMATCH  
120 UNIT CODE 06 "  
MISMATCH  
121 UNIT CODE 07 "  
MISMATCH  
122 UNIT CODE 08 "  
MISMATCH  
123 UNIT CODE 09 "  
MISMATCH  
124 UNIT CODE 10 "  
MISMATCH  
125 UNIT CODE 11 "  
MISMATCH  
126 UNIT CODE 12 "  
MISMATCH  
127 UNIT CODE 13 "  
MISMATCH  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
Alarm  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
no  
128 UNIT CODE 14 "  
MISMATCH  
129 UNIT CODE 15 "  
98  
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MISMATCH  
130 UNIT CODE 16 "  
MISMATCH  
131 UNIT CODE 17 "  
MISMATCH  
Alarm  
Alarm  
Alarm  
yes  
yes  
yes  
yes  
yes  
yes  
no  
no  
no  
132 UNIT CODE 18 "  
MISMATCH  
99  
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Chapter 3  
iCOM  
Control Board Connections  
Introduction  
This section describes the basic connection points on the Liebert Deluxe  
System 3 units. Each sub-section describes the standard electrical connections  
supplied with the iCOM controls. The detail is as follows:  
Display Assembly: Large and Small  
Plug and Terminal Block Connections  
Fuse Board: All Units  
100  
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LCD Display Board  
The Advanced and Advanced with Graphics LCD display board is mounted to the  
system unit accent panel. The LCD display board connection to the system  
control board is identified as ribbon connector P26.  
Large Disdplay  
Small Display  
101  
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Control Board DIP Switches and Plug Connectors  
This section deals with the 20 plug connections and the terminal block located on  
the unit control board. The tables in this section show all of the pin connections  
and the reference points for signal flow through these connections.  
Unit Mounted Control Board  
102  
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iCOM Control Board DIP Switch #2 Settings  
Connector  
Input/ Output Type  
NTC Thermistor  
Setting  
P7-1 (+)/ P7-2 (-)  
* Software (ASW1 = 1)  
Software (ASW1 = 0)  
* Sw2-1: Off/ Sw2-2: Off  
Sw2-1: On/ Sw2-2: Off  
Sw2-1: On/ Sw2-2: On  
None  
PTC Thermistor  
P11-1 (+)/ P11-2 (-)  
Analog Voltage: 0 to +10V  
Analog Voltage: 0 to +5V  
Analog Current: 4 to 20mA  
+5V Output  
P11-3 (+)/ P11-4 (-)  
P11-5 (+)/ P11-6 (-)  
Analog Voltage: 0 to +10V  
Analog Voltage: 0 to +5V  
Analog Current: 4 to 20mA  
+5V Output  
* Sw2-3: Off/ Sw2-4: Off  
Sw2-3: On/ Sw2-4: Off  
Sw2-3: On/ Sw2-4: On  
None  
P11-7 (+)/ P11-8 (-)  
P12-1 (+)/ P12-2 (-)  
Analog Voltage: 0 to +10V  
Analog Voltage: 0 to +5V  
Analog Current: 4 to 20mA  
+5V Output  
* Sw2-5: Off/ Sw2-6: Off  
Sw2-5: On/ Sw2-6: Off  
Sw2-5: On/ Sw2-6: On  
None  
P12-3 (+)/ P12-4 (-)  
P12-5 (+)/ P12-6 (-)  
Analog Voltage: 0 to +10V  
Analog Voltage: 0 to +5V  
Analog Current: 4 to 20mA  
+5V Output  
* Sw2-7: Off/ Sw2-8: Off  
Sw2-7: On/ Sw2-8: Off  
Sw2-7: On/ Sw2-8: On  
None  
P12-7 (+)/ P12-8 (-)  
P13-1 (+)/ P13-2 (-)  
NTC Thermistor  
* Software (ASW2 = 1)  
Software (ASW2 = 0)  
Sw2-9: On  
PTC Thermistor  
P13-3 (+)/ P13-4 (-)  
P13-5 (+)/ P13-6 (-)  
NTC Thermistor  
NTC Scroll Thermister  
NTC Thermistor  
* Sw2-9: Off  
Sw2-10: On  
NTC Scroll Thermister  
* Sw2-10: Off  
* Default Setting  
103  
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iCOM Control Board Jumper Settings  
Jumper  
Type  
Setting  
* On: Shunt on Pins 1 & 2  
Off: No Shunt  
P19  
Watchdog  
CAN Bus  
Terminator  
On: Shunt on Pins 2 & 3  
* Off: Shunt on Pins 1 & 2  
P78  
P83  
Enabled: Shunt on Pins 1 & 2  
* Disabled: No Shunt  
Bootloader  
* Default Setting  
Large Display DIP Switch #3 Settings  
Position  
Type  
Setting  
Off  
1
2
3
4
5
6
7
8
CAN Address  
CAN Address  
CAN Address  
CAN Address  
CAN Address  
CAN Address  
CAN Baud  
Off  
Off  
Off  
Off  
Off  
Off  
CAN Baud  
Off  
104  
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Large Display Jumper Settings  
Jumper  
Type  
Setting  
P3  
Watchdog  
* Shunt on Pins 1 & 2  
Manual Contrast  
(Rev. 1)  
P4  
* Shunt on Pins 2 & 3  
P8  
open  
open  
* open  
* open  
P13  
P78  
CAN Termination  
* Shunt on Pins 2 & 3  
Watchdog  
(Rev. 2 Only)  
P82  
P83  
* Shunt on Pins 1 & 2  
* Shunt on Pins 2 & 3  
Bootloader  
* Default Setting  
Small Display DIP Switch #3 Settings  
Position  
Type  
Setting  
Off  
1
2
3
4
5
6
7
8
CAN Address  
CAN Address  
CAN Address  
CAN Address  
CAN Address  
CAN Address  
CAN Baud  
Off  
Off  
Off  
On  
On  
Off  
CAN Baud  
Off  
105  
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Small Display Jumper Settings  
Type Setting  
Jumper  
Manual Contrast  
(Rev. 2 only)  
P4  
* Shunt on Pins 2 & 3  
P78  
P80  
CAN Termination  
BDM Header  
* Shunt on Pins 2 & 3  
* open  
Watchdog  
(Rev. 2 Only)  
P82  
* Shunt on Pins 1 & 2  
* Default Setting  
Temperature/ Humidity Board DIP Switch #1 Settings  
Position  
Type  
Setting  
Off  
Notes  
1
2
3
4
CAN Address  
CAN Address  
CAN Address  
CAN Address  
On (if Sensor A)  
On (if Sensor B)  
On (if Sensor C)  
open  
Off  
Off  
Off  
On (Normal &  
Constant Operation)  
5
6
CAN Address  
Off (Analog Mode)  
On (Analog Mode &  
Constant Operation)  
CAN Address Off (Normal Operation)  
7
8
CAN Baud  
CAN Baud  
Off  
Off  
open  
open  
Temperature/ Humidity Board Jumper Settings  
Jumper  
P2  
Type  
Setting  
* open  
BDM Header  
CAN Termination  
Programming  
P3  
* Shunt on Pins 2 & 3  
* open  
P4  
* Default Setting  
106  
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DS Systems:  
P3: Not Used  
P4: 24 VAC Power  
P4-1: Fuse 1 (24 VAC)  
P4-2: Fuse 2 (24 VAC)  
P4-3: Fuse 3 (24 VAC)  
P4-4: Fuse 4 (24 VAC)  
P7: Fluid Sensor  
P7-1: Aquastat Sensor  
P7-2: Aquastat Sensor  
P8: 24 VAC Alarm Inputs  
P8-1: 24 VAC (RAD1/ TS 50)  
P8-2: 24 VAC (RAD2/ TS 51)  
P8-3: 24 VAC (RAD3/ TS 55)  
P8-4: 24 VAC (RAD4/ TS 56)  
P8-5: 24 VAC (HWA)  
P8-6: 24 VAC Out (TS 24)  
P8-7: 24 VAC Out (HWA)  
P8-8: no connection  
P11: Low Pressure Switch Circuits  
P11-1: DCV Signal to LPT1  
P11-2: Cold Start Bypass 1 Signal  
P11-3: LPT1 Input to MP  
P11-4:  
P11-5: DCV Signal to LPT2  
P11-6: Cold Start Bypass 1 Signal  
P11-7: LPT2 Input to MP  
P11-8:  
P12: Analog Sensor Inputs  
P12-1: T+ Analog 1 (TS 41)  
P12-2: T- Analog 1 (TS 42)  
P12-3: T+ Analog 2 (TS 43)  
P12-4: T- Analog 2 (TS 44)  
P12-5: T+ Analog 3 (TS 45)  
P12-6: T- Analog 3 (TS 46)  
P12-7: T+ Analog 4 (TS 47)  
P12-8: T- Analog 4 (TS 48)  
P13: DCV Thermistor Signals  
P13-1: DCV Signal to Digital Scroll Thermistor 1  
P13-2: DCV Signal from Digital Scroll Thermistor 1  
P13-3: DCV Signal to Digital Scroll Thermistor 2  
P13-4: DCV Signal from Digital Scroll Thermistor 2  
P13-5: DCV Signal to Customer Thermistor  
P13-6: DCV Signal from Customer Thermistor  
107  
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P22: Glycool Valve (Std. Pressure Actuator)  
P22-1: 24 VAC Out (Close Q18)  
P22-4: DCV Signal  
P22-2: DCV Signal  
P22-3: 24 VAC Out (Open Q17)  
P22-5: E2 (24 VAC Gnd)  
P22-6: +5 VDC  
P32: Compressor Devices  
P32-1: 24 VAC Out (LLSV1)  
P32-2: E1 (LLSV1)  
P32-8:  
P32-9:  
24 VAC  
24 VAC (HP1 Alarm)  
P32-3: 24 VAC Out (LLSV2)  
P32-4: 24 VAC Out (OL/ KL1/ HP1)  
P32-5: 24 VAC Out (OL/ KL2/ HP2)  
P32-6: 24 VAC (HP1)  
P32-10: 24 VAC Out (C1)  
P32-11: E1 (C1)  
P32-12: 24 VAC Out (C2)  
P32-13: E2 (C2)  
P32-7: 24 VAC (HP2)  
P33: Compressor Devices  
P33-1: 24 VAC Out (CUV1/ DSV1)  
P33-2: E1 (CUV1/ DSV1)  
P33-3: E2 (LLSV2)  
P33-4: 24 VAC Out (CUV2/ DSV2)  
P33-5: E2 (CUV2/ DSV2)  
P33-6: 24 VAC (OL/ KL1 Alarm)  
P33-7:  
P33-8:  
P33-9:  
P33-10:  
P33-11:  
P33-12:  
24 VAC (OL/ KL2 Alarm)  
24 VAC  
24 VAC (HP2 Alarm)  
P34: Reheat Devices  
P34-1: 24 VAC Out (RS1/ RS2/ RS3) P34-7:  
no connection  
P34-2: E3 (RS1/ RS2/ RS3)  
P34-3: E3 (GCD/ BR)  
P34-8:  
P34-9:  
24 VAC Out (RH3)  
no connection  
P34-4: 24 VAC Out (RH1/ HGRS)  
P34-5: no connection  
P34-10: E3 (RH1/ HGRS/ RH2/ RH3)  
P34-11: no connection  
P34-6: 24 VAC Out (RH2)  
P34-12: 24 VAC Out (GCD/ BR)  
P35: Infrared Humidifier Devices  
P35-1: 24 VAC Out (H)  
P35-2: E3 (H)  
P35-4: E4 (HMV)  
P35-5: E3 (HS3)  
P35-3: 24 VAC Out (HMV)  
P35-6: 24 VAC Out (HS3)  
P36: Basic Unit Connections  
P36-1: 24 VAC Out (Filter Clog)  
P36-2: 24 VAC (Filter Clog Alarm)  
P36-3: 24 VAC Out (MF)  
P36-4: 24 VAC Out (AS Switch)  
P36-5: 24 VAC (AS Alarm)  
P36-6: 24 VAC (MF Ovld Alarm)  
P36-7: 24 VAC  
P36-9:  
P36-10: E2  
no connection  
P36-11: No connection  
P36-12: No connection  
P36-13: K3 (Common: TB75)  
P36-14: K3 (N.O.: TB76/ R3)  
P36-15: K3 (N.C.)  
P36-8: E4 (MF)  
108  
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P38: Smoke Detector  
P38-1: 24 VAC Out SDC)  
P38-2: E4 (SDC)  
P38-3: 24 VAC (RAD1)  
P38-4: no connection  
P39: Firestat & Remote Shutdown  
P39-1: 24 VAC Out (HTS)  
P39-3: 24 VAC Out (RDS1)  
P39-2: 24 VAC Return (HTS)  
P39-4: 24 VAC Return (RSD1)  
P40: Basic Unit Connections  
P40-1: no connections  
P40-2: no connections  
P40-3: no connections  
P40-8:  
P40-9:  
P40-10: E4  
E4 (Opt. CPAR)  
no connection  
P40-4: 24 VAC Out (Opt. CPAR) P40-11: no connection  
P40-5: no connections  
P40-6: no connections  
P40-7: no connections  
P40-12: 24 VAC Out (MF Ovld)  
P40-13: 24 VAC  
P43: T6 Transformer  
P43-1: 24 VAC Gnd  
P43-2: 24 VAC  
P51: Hot Water Reheat  
P51-1: 24 VAC Out  
P51-2: -5 VDC Gnd  
P51-3: H.W. Mod (0 – 2.5 VDC)  
P51-4: 24 VAC Gnd (E1)  
P52: Glycool Valve (Opt. Pressure Modulating)  
P52-1: 24 VAC Out  
P52-4: 24 VAC Gnd (E1)  
P52-2: -5 VDC Gnd  
P52-5: no connection  
P52-3: Mod Valve (0 – 2.5 VDC)  
P53:  
P53-1: 24 VAC  
P53-2: no connection  
P53-3: no connection  
P53-4: E3  
P53-5: no connection  
P54:  
P54-1: 24 VAC  
P54-2: no connection  
P54-3: no connection  
P54-4: E3  
P54-5: no connection  
109  
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P67: Temperature/ Humidity Sensors  
P67-1:  
P67-6:  
P16-3:  
P16-4:  
P65: Site Monitoring Signals – No Intelleslot Supplied  
P65-1: +5 VDC to TS 78  
P65-2: -5 VDC to TS 77  
P65: Optional Intelleslot Power Suplly  
P65-1:  
P65-2:  
P65-3:  
P65-4:  
P64: Unit Large Display (Digital Signals)  
P66: Unit Small Display (Digital Signals)  
TB1: 24 VAC  
TB1-1: 24 VAC (T2)  
TB1-2: 24 VAC (T3)  
TB1-3: 24 VAC (T4)  
TB1-4: 24 VAC (T5)  
TB1-5: E1 (G2)  
TB1-6: E2 (G3)  
TB1-7: E3 (G4)  
TB1-8: E4 (G5)  
E1/ E2/ E3/ E4: Transformer Grounds  
110  
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Fuse Board Layout: All Units  
This section deals with the seven (7) plug connectors on the fuse board. The fuse  
board is supplied on all systems with iCOM and is located in the low voltage  
section of the unit. The tables in this section show all of the connections and  
reference points for signal flow through these connectors.  
Fuse Board  
P4: 24 VAC Power  
P4-1: Fuse 1  
P4-2: Fuse 2  
P4-3: Fuse 3  
P4-4: Fuse 4  
P24: T1 Transformer  
P24-1: 24 VAC Gnd (T1)  
P24-2: 24 VAC (T1)  
P41: 24 VAC Power  
P41-1: 24 VAC Gnd (T1)  
P41-2: 24 VAC (T1)  
P41-3: 24 VAC Gnd (not unit ground)  
P41-4: 24 VAC  
P42: Intelleslot  
P42-1: 24 VAC Gnd (not unit ground)  
P42-2: 24 VAC  
P43: T6 Transformer  
P43-1: 24 VAC Gnd (not unit ground)  
P43-2: 24 VAC  
P44: Jumper  
E1: Transformer Secondary Ground (unit ground)  
111  
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Temperature/ Humidity Board: All Units  
This section deals with the single plug connection located on the system  
temperature and humidity board. The temperature/ humidity board is supplied on  
all systems with iCOM controls. The cable is plugged into Plug P67 on the unit  
microprocessor board and transmits information using “CAN” – Controlled Area  
Network communication. Troubleshooting is accomplished by observing an LED  
located on the board. If the LED is glowing the board is good. The temperature  
and humidity board is typically located in the unit return.  
Humidity  
Sensor  
Temperature  
Sensor  
Power  
Supply  
CAN Bus Connectors  
Temperature/ Humidity Board  
P67: Return Air Temperature/ Humidity Board  
P67-1: CAN communication  
P67-6: CAN communication  
Temperature/ Humidity Assembly Housing  
112  
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NOTES  
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Chapter 4  
General Troubleshooting Data  
* Basic Operation of the Opto and Triac  
* Troubleshooting the Opto-Isolator and Triac  
* Control Input Check (Sensors)  
* Frequency Conversion Chart (Temperature)  
* Frequency Conversion Chart (Humidity)  
* Troubleshooting Signals and Checklist  
* Moisture Content Charts  
This section covers only very basic electronics. The major components, such as  
triacs and opto-isolators are briefly described and related to the Liebert units you  
have come to study. It is our hope that this brief introduction to electronics  
stimulates your interest and encourages you to go further in the field.  
The path of a signal from beginning to the end - using the four block process.  
T/H  
C P U  
INPUT  
MICRO  
OUTPUT  
LOAD  
MEMORY  
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The temperature sensor senses a rise in temperature. The rise is transmitted to  
the Central Processing Unit (CPU). The CPU looks into its memory for information  
and instructions on what to do with the rise in temperature. The CPU then makes  
the decision to call for cooling.  
Isolation  
We use the opto-isolator and the triac to isolate areas of control and voltage.  
There are three areas of control and two voltage levels. Digital control comes from  
the microprocessor at 5 VDC and the other voltage level is 24 VAC. One voltage  
is used to turn on the triac and the other is used to operate the load device.  
DIGITAL  
CONTROL  
POWER  
Processor  
5 VDC Signal  
Transformer  
Power 24 VAC  
TRIAC  
OPTO  
Load  
Device  
Transformer  
5 VDC  
Power 24 VAC  
Ground  
ISOLATION  
ISOLATION  
Areas of Control  
115  
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BASIC OPERATION OF THE TRIAC  
To better understand the operation of the triac, we need to look at the movement  
of electrons in a special type of material used in electronics. Here we have a  
semiconductor material with what is called a depletion region. The depletion  
region restricts the flow of electrons to a point.  
+ + + +  
+ + + +  
+ + + +  
- - - -  
- - - -  
- - - -  
Depletion Region  
Semiconductor  
By forcing more electrons in to the depletion region, we can cause an overflow of  
these electrons resulting in electron flow that in turn produces current. When we  
have current flow, the device is on.  
+ + + +  
+ + + +  
+ + + +  
- - - -  
- - - -  
- - - -  
Depletion Region  
Semiconductor Showing No Movement of Electrons  
If we add a third terminal to this simple device and call it the Gate, we have a basic  
triac. By sending electrons to the gate, which is connected to the depletion region,  
we create an overflow condition. You can see how this device can be turned on or  
off by this process. Now to put this in perspective with AC voltage circuits, this ON  
and OFF condition takes place every half cycle. When the AC voltage is removed  
from the gate, conduction stops.  
+++---  
+++---  
+++---  
+++---  
+++---  
+ + + +  
+ + + +  
+ + + +  
- - - -  
- - - -  
- - - -  
- - -  
+ + +  
IN  
OUT  
GATE  
Semiconductor Showing Movement of Electrons  
116  
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The triacs that Liebert uses are standard in the industry and are rated at a 2-amp  
capacity. You can check these devices for proper operation while they are  
connected in the circuit. If the load is removed from the device, you can get a  
false reading from the meter. This is because the voltage potential is present and  
is detected by the meter. When the load is applied to the device, the potential is  
not detected by the meter. To test a triac for proper operation, energize the circuit  
and connect the load.  
O
Heat Sink  
Body  
Terminals  
Front View  
Left Side View  
Front and Left Side Views of the Triac  
As your view the triac from the front, the terminals are numbered as follows:  
Terminal  
Left  
Connection  
#2 Connects to the Load  
Middle  
Right  
#1 Connects to the Transformer power  
G(ate) Connects to the Opto-Isolator  
Below is a simple schematic drawing for the triac using Liebert symbols.  
24 VAC  
Transformer  
Power  
Triac  
2
Load  
Device  
1
G
6
4
2
1
Opto  
Schematic Drawing for the Triac  
117  
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Basic Operation of the Opto-Isolator  
The purpose of the opto-isolator is to provide isolation of two voltage sources.  
This allows a DC voltage source to activate an AC voltage load device or allows  
an AC voltage source to provide a DC signal.  
We are working with two types of circuits, an input and an output. Therefore, we  
require two types of opto-isolators (referred to as optos).  
The output opto uses a DC voltage source to activate a Light Emitting Diode (LED)  
internal to the IC chip. This causes a triac, also internal to the IC chip, to switch  
ON allowing current to flow to the AC load device.  
LED  
LED  
AC  
Sourc  
AC  
Sourc  
DC  
Sourc  
DC  
Sourc  
No Current Flow  
Output Opto-Isolator  
Current Flow  
The input opto uses an AC voltage source to activate dual LEDs and turn on a  
transistor to pass the DC voltage and allow current to flow.  
Dual LEDs  
Dual LEDs  
DC  
Sourc  
DC  
Sourc  
AC  
Sourc  
AC  
Sourc  
No Current Flow  
Current Flow  
Input Opto-Isolator  
118  
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Troubleshooting the Output Opto-Isolator  
The opto-isolator IC chips used in these circuits are the H11J (output) devices. The  
drawing shows the pin location for component checks on the output opto. The  
indented circle in the upper left hand corner of this chip indicates the location of Pin  
1. Note that the number sequence is in a "U" format: downward 1, 2 and 3 on the  
left and upward 4, 5 and 6 on the right.  
1
6
2
3
5
4
Output Opto-Isolator Pin Location  
OUTPUT VOLTAGE CHECK  
Pin 1  
Pin 2  
Pin 3  
Pin 4  
Pin 5  
Pin 6  
Receives the DC source voltage (3.3 VDC range)  
Completes the DC source to the digital ground  
No voltage signal at this point  
Receives the AC source voltage signal from the input transformer  
No voltage signal at this point  
Completes the AC voltage path to the gate of the triac (24VAC)  
Note that all AC source checks are referenced to the associated transformer  
neutral and/or the safety ground, and that the DC source reference is to V- or  
digital ground.  
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Troubleshooting the Input Opto-Isolator  
The opto-isolator IC chips used in these circuits are the H11AA (input) devices. The  
pin location for component checks on the input opto. The indented circle in the  
upper left hand corner of this chip indicates the location of Pin 1. Note that the  
number sequence is in a "U" format: down 1 and 2 on the left and up 3 and 4 on  
the right.  
1
4
2
3
Input Opto-Isolator Pin Location  
INPUT VOLTAGE CHECK  
Receives the AC source voltage (This voltage is 24 VAC prior to the Opto  
and is about 1.2 VAC at the opto).  
Pin 1  
Pin 2  
Pin 3  
Completes the AC source to the neutral and or safety ground.  
Completes the DC source to the digital ground.  
Receives the DC voltage source from the microprocessor (This voltage  
level is 3.3 VDC when not activated and is 0 VDC when activated.)  
Pin 4  
Note that all AC source checks are referenced to the associated transformer  
neutral and/or the safety ground, and that the DC source reference is to -V or  
digital ground.  
120  
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Microprocessor Control Board: Typical Location othe  
Opto-Isolators and Triacs  
Input Opto-Islators  
Output Opto-Isolators and Triacs  
Microprocessor Control Board  
Alarm Input Opto-Isolator Legend:  
Opto  
Purpose  
Opto  
Purpose  
U15 Air Safety Switch  
U16 Custom Alarm 1  
U17 Custom Alarm 2  
U18 High Water Alarm  
U19 Custom Alarm 3  
U20 Humidifier Problem  
U21 Filter Clog switch  
U22 Main Fan Overload  
U23 Power On  
U24 Compressor 2 Overload  
U25 Low Pressure Switch 2  
U26 High Head Pressure 2  
U27 Compressor 1 Overload  
U28 Low Pressure Switch 1  
U29 High Head Pressure 1  
121  
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Note: Use Pin 5 on the input opto-isolator with reference to the V- terminal  
for voltage check. The voltage level is 5 VDC.  
Control Output Opto-Isolator Legend:  
Opto  
U1  
Purpose  
Reheat 1  
Opto  
Purpose  
U10 Compressor 2  
U2  
Reheat 2  
U11 Econ-O-Cycle Relay (R5)  
U12 Liquid Line Solenoid 1  
U13 Hot Gas Bypass 2  
U14 Compressor 1  
U3  
Reheat 3  
U4  
Humidifier  
U5  
Main Fan  
U8  
Liquid Line Solenoid 2  
Hot Gas Bypass 2  
U17 CW Actuator  
U9  
U18 CW Actuator Close  
Note: Use Pin 4 on the output opto-isolator with reference to the correct  
transformer neutral/ ground. The voltage level is 24 VAC.  
Control Output Triac Legend:  
Opto  
Purpose  
Opto  
Purpose  
Q1 Reheat 1  
Q10 Compressor 2  
Q2 Reheat 2  
Q11 Econ-O-Cycle Relay (R5)  
Q12 Liquid Line Solenoid 1  
Q13 Hot Gas Bypass 2  
Q14 Compressor 1  
Q3 Reheat 3  
Q4 Humidifier  
Q5 Main Fan  
Q8 Liquid Line Solenoid 2  
Q9 Hot Gas Bypass 2  
Q17 CW Actuator  
Q18 CW Actuator Close  
122  
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iCOM Diagnostics / Service Mode Program  
The iCOM controller has a valuable tool built into software under the SERVICE  
MENU. This program allows the user to evacuate and charge the refrigerant circuit  
at installation, turn on/off all loads (outputs) for testing, and allows user to check all  
inputs.  
The procedure is as follows:  
1- From the main screen select the SERVICE MENU parameters.  
2- In the SERVICE MENU screen select the SERVICE icon.  
3- Enter password and scroll to MANUAL MODE, select YES with the up key.  
4- Now scroll to Fan On and select ON with the up key. The fan must be on to  
operate loads in this mode. You must turn off the fan and service mode when  
completed.  
The Compressor 1 and 2 selections are for the ON/OFF and RUN, EVACUATE,  
and CHARGE modes.  
When user scrolls to the Compressor 1 or 2 positions in the parameters list he  
must press enter to select the first item. Enter again will move the cursor to the  
ON/OFF selection first (far right item) then using the up arrow key the compressor  
may be turn on and down key will turn off. Now with the cursor on the ON/OFF  
position, now use the right arrow key to select the RUN, EVACUATE, CHARGE  
function and the up or down arrow key to make changes. The RUN selection is the  
normal operating position.  
Parameters list is found on pages in Chapter 2  
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Basic Troubleshooting Steps:  
Example: Unit load is not energizing.  
Programming:  
1. Read and record all program parameter values.  
2. Read and record all DIP (control) switch positions on all boards. Check all  
jumpers on each board, check for the CAN healthy light on the boards and  
check programming per the read and record sheet in appropriate manuals to  
verify selected options.  
3. Turn Unit off with ON/OFF button and reboot system power (disconnect switch  
off - on) to reconfigure system. If programming error is detected, recheck unit  
for proper operation.  
If problem is not resolved in programming section, begin the signal flow check.  
Signal Flow Check: Assumption is the unit is calling for a mechanical operation  
but the load is not activated. Using the appropriate control training and service  
manual, identify the output opto-isolator to be checked, locate the opto-isolator on  
the PCB and perform the following.  
DC Voltage check:  
1. Using a digital voltmeter check for the correct VDC signal at the output opto-  
isolator. Pin 1 referenced to - VDC will show low VDC (approximately 1.2  
VDC) if the microprocessor control side of the device is functioning. A high  
VDC (approximately 3.3 VDC) indicates a microprocessor control problem. A  
meter reading of 0 VDC indicates a loss of microprocessor voltage, check VDC  
at the power supply referenced +VDC to -VDC should be approximately 3.3  
VDC.  
2. This check involves the microprocessor. To bypass the microprocessor  
completely, jumper from Pin 2 on the output opto-isolator to -VDC. As soon as  
the jumper is applied the load device should activate. If the load device  
activates the problem is in the microprocessor itself or the programming. If the  
load device does not activate continue the signal flow check.  
AC Voltage check:  
1. Place the digital VOM meter on AC voltage scale and verify that 24 VAC is  
being applied to the output opto-isolator by placing the VOM between Pin 4  
and the proper transformer ground connection. To verify that the switch leg of  
the output opto-isolator is working properly place the VOM between Pin 6 and  
the proper transformer ground connection. A high VAC (approximately 24  
VAC) display indicates a closed switch leg; a low VAC indicates an open switch  
leg.  
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2. If the programming is correct and the output opto-isolator is functioning  
properly but the load device is not activated the next step is to check the  
triac and hard wiring to the load device. Verify that 24 VAC is being applied  
to Pin 1 of the triac, place the VOM leads between Pin 1 and the proper  
transformer ground connection. If 24 VAC is not present at Pin 1 of the  
triac backtrack the circuit to the proper secondary hot of the control  
transformer.  
If 24 VAC is present perform the following:  
Select the appropriate diagnostics function from the control menu; use the training  
and service manual for reference. During the TEST OUTPUTS function the green  
LED on the microprocessor should light. If the LED lights check the hardware from  
the plug to the load device. If the LED does not light run the TEST CONTROL  
BOARD diagnostics function. If board failure is displayed contact your local sales  
office.  
Note: Triacs are current limiting devices; therefore the load device must be  
connected to obtain valid voltage readings when doing VOM checks and circuit  
troubleshooting. Repair or replace any missing or defective components in the  
circuit.  
Mechanical Problems: If the failure of the load device to activate is determined  
to be mechanical in nature consult the appropriate Liebert system operation and  
maintenance, reference the individual component manufacturers literature or  
contact your local Liebert representative.  
125  
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Moisture Content Charts  
The following charts show moisture content of various levels of relative humidity  
given temperatures. Follow the procedures below to use the charts:  
for  
STEP 1: Locate the chart for the temperature with which you are working.  
STEP 2: Locate the line with the relative humidity with which you are  
working.  
STEP 3: Read the moisture content of the relative humidity in either grains  
per cubic foot or grains per pound of air.  
For example, you have a room temperature of 70°F and 50% relative humidity.  
STEP 1: Locate the chart for 70°F.  
STEP 2: Locate the line with relative humidity 50%.  
STEP 3: Read the moisture content value of 50% relative humidity (4.0275  
grains per cubic foot of air OR 55.86143 grains per pound of air).  
126  
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Moisture Content at Temperature = 80°F (26.7ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
3.864  
3.9744  
4.0848  
4.1952  
4.3056  
4.416  
53.59368  
55.12493  
56.65618  
58.18743  
59.71868  
61.24992  
62.78116  
64.31241  
65.84367  
67.37492  
68.90616  
70.43741  
71.96865  
73.4999  
4.5264  
4.6368  
4.7472  
4.8576  
4.968  
5.0784  
5.1888  
5.2992  
5.4096  
5.52  
75.03115  
76.5624  
5.6304  
5.7408  
5.8512  
5.9616  
6.072  
78.09365  
79.6249  
81.15615  
82.68739  
84.21864  
85.74989  
87.28112  
88.81239  
90.34362  
91.87488  
93.40612  
94.93738  
96.46862  
97.99987  
99.53111  
6.1824  
6.2928  
6.4032  
6.5136  
6.624  
6.7344  
6.8448  
6.9552  
7.0656  
7.176  
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Moisture Content at Temperature = 79°F (26.1ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
3.7485  
3.8556  
3.9627  
4.0698  
4.1769  
4.284  
51.9917  
53.47717  
54.96265  
56.44813  
57.9336  
59.41908  
60.90456  
62.39004  
63.87551  
65.36099  
66.84647  
68.33194  
69.81742  
71.3029  
4.3911  
4.4982  
4.6053  
4.7124  
4.8195  
4.9266  
5.0337  
5.1408  
5.2479  
5.355  
72.78838  
74.27385  
75.75933  
77.2448  
5.4621  
5.5692  
5.6763  
5.7834  
5.8905  
5.9976  
6.1047  
6.2118  
6.3189  
6.426  
78.73028  
80.21575  
81.70123  
83.18671  
84.67218  
86.15767  
87.64314  
89.12862  
90.6141  
6.5331  
6.6402  
6.7473  
6.8544  
6.9615  
92.09958  
93.58504  
95.07052  
96.55601  
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Moisture Content at Temperature = 78°F (25.6ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
3.633  
50.38971  
51.82942  
53.26913  
54.70883  
56.14854  
57.58824  
59.02795  
60.46765  
61.90736  
63.34707  
64.78677  
66.22648  
67.66618  
69.10589  
70.5456  
3.7368  
3.8406  
3.9444  
4.0482  
4.152  
4.2558  
4.3596  
4.4634  
4.5672  
4.671  
4.774801  
4.8786  
4.9824  
5.0862  
5.19  
71.9853  
5.2938  
5.3976  
5.5014  
5.605201  
5.709  
73.425  
74.86471  
76.30441  
77.74413  
79.18383  
80.62335  
82.06325  
83.50295  
84.94265  
86.38236  
87.82207  
89.26176  
90.70148  
92.14118  
93.58089  
5.812801  
5.9166  
6.0204  
6.1242  
6.228  
6.3318  
6.4356  
6.5394  
6.6432  
6.747  
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Moisture Content at Temperature = 77°F (25.0ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
3.521  
48.83628  
50.2316  
3.6216  
3.7222  
3.8228  
3.9234  
4.024  
51.62691  
53.02224  
54.41756  
55.81288  
57.20821  
58.60353  
59.99885  
61.39417  
62.78949  
64.18481  
65.58013  
66.97546  
68.37078  
69.7661  
4.124601  
4.2252  
4.3258  
4.4264  
4.527  
4.6276  
4.7282  
4.8288  
4.9294  
5.03  
5.1306  
5.2312  
5.3318  
5.4324  
5.533001  
5.6336  
5.734201  
5.8348  
5.935401  
6.036001  
6.136601  
6.237201  
6.3378  
6.438401  
6.539  
71.16143  
72.55674  
73.95206  
75.34738  
76.74271  
78.13803  
79.53336  
80.92868  
82.32401  
83.71933  
85.11465  
86.50996  
87.90529  
89.30061  
90.69593  
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Moisture Content at Temperature = 76°F (24.4ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
3.41215  
3.50964  
3.60713  
3.70462  
3.80211  
3.8996  
47.32652  
48.67871  
50.03089  
51.38307  
52.73527  
54.08745  
55.43964  
56.79182  
58.14401  
59.4962  
3.99709  
4.09458  
4.19207  
4.28956  
4.38705  
4.48454  
4.58203  
4.67952  
4.77701  
4.8745  
60.84838  
62.20057  
63.55276  
64.90494  
66.25713  
67.60931  
68.9615  
4.97199  
5.06948  
5.16697  
5.26446  
5.36195  
5.45944  
5.55693  
5.65442  
5.75191  
5.8494  
70.31368  
71.66587  
73.01805  
74.37024  
75.72243  
77.07461  
78.4268  
79.77898  
81.13118  
82.48336  
83.83555  
85.18773  
86.53992  
87.8921  
5.94689  
6.04438  
6.14187  
6.23936  
6.336849  
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Moisture Content at Temperature = 75°F (23.9ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
3.3068  
45.86532  
47.17575  
48.48619  
49.79663  
51.10707  
52.4175  
3.40128  
3.49576  
3.59024  
3.68472  
3.7792  
3.87368  
3.96816  
4.06264  
4.15712  
4.251601  
4.34608  
4.44056  
4.53504  
4.62952  
4.724  
53.72794  
55.03838  
56.34882  
57.65926  
58.9697  
60.28013  
61.59057  
62.901  
64.21145  
65.52188  
66.83231  
68.14276  
69.45319  
70.76363  
72.07407  
73.38451  
74.69495  
76.00539  
77.31581  
78.62625  
79.9367  
4.81848  
4.91296  
5.00744  
5.10192  
5.1964  
5.29088  
5.38536  
5.479841  
5.57432  
5.6688  
5.76328  
5.85776  
5.95224  
6.04672  
6.1412  
81.24713  
82.55757  
83.86801  
85.17844  
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Moisture Content at Temperature = 74°F (23.3ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
3.20355  
3.29508  
3.38661  
3.47814  
3.56967  
3.6612  
44.43324  
45.70276  
46.97228  
48.2418  
49.51132  
50.78085  
52.05037  
53.31989  
54.58941  
55.85893  
57.12845  
58.39797  
59.66749  
60.93701  
62.20654  
63.47605  
64.74558  
66.0151  
3.75273  
3.84426  
3.93579  
4.02732  
4.11885  
4.21038  
4.30191  
4.39344  
4.48497  
4.5765  
4.66803  
4.75956  
4.85109  
4.94262  
5.03415  
5.12568  
5.21721  
5.30874  
5.40027  
5.4918  
67.28461  
68.55414  
69.82366  
71.09318  
72.3627  
73.63223  
74.90173  
76.17126  
77.44079  
78.7103  
5.58333  
5.67486  
5.76639  
5.85792  
5.94945  
79.97983  
81.24935  
82.51887  
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Moisture Content at Temperature = 73°F (22.8ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
3.10345  
3.19212  
3.28079  
3.36946  
3.45813  
3.5468  
43.04485  
44.2747  
45.50456  
46.73441  
47.96426  
49.19412  
50.42397  
51.65382  
52.88367  
54.11352  
55.34338  
56.57323  
57.80309  
59.03294  
60.26279  
61.49264  
62.72249  
63.95235  
65.1822  
3.63547  
3.72414  
3.81281  
3.90148  
3.99015  
4.07882  
4.16749  
4.25616  
4.34483  
4.4335  
4.52217  
4.61084  
4.69951  
4.78818  
4.87685  
4.96552  
5.05419  
5.14286  
5.23153  
5.3202  
66.41206  
67.64191  
68.87176  
70.10161  
71.33146  
72.56132  
73.79117  
75.02102  
76.25087  
77.48073  
78.71058  
79.94044  
5.40887  
5.49754  
5.58621  
5.67488  
5.76355  
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Moisture Content at Temperature = 72°F (22.2ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
2.9988  
41.59336  
42.78174  
43.97012  
45.1585  
3.08448  
3.17016  
3.25584  
3.34152  
3.4272  
46.34688  
47.53527  
48.72365  
49.91203  
51.10041  
52.28879  
53.47717  
54.66555  
55.85393  
57.04232  
58.2307  
3.51288  
3.59856  
3.68424  
3.76992  
3.8556  
3.94128  
4.02696  
4.11264  
4.19832  
4.284  
59.41908  
60.60746  
61.79584  
62.98422  
64.17261  
65.36099  
66.54937  
67.73775  
68.92613  
70.11452  
71.30289  
72.49128  
73.67966  
74.86805  
76.05642  
77.2448  
4.36968  
4.45536  
4.54104  
4.62672  
4.7124  
4.79808  
4.88376  
4.96944  
5.05512  
5.1408  
5.22648  
5.31216  
5.39784  
5.48352  
5.5692  
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Moisture Content at Temperature = 71°F (21.7ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
2.91165  
2.99484  
3.07803  
3.16122  
3.24441  
3.3276  
40.38459  
41.53843  
42.69228  
43.84613  
44.99997  
46.15381  
47.30766  
48.46151  
49.61535  
50.7692  
3.41079  
3.49398  
3.57717  
3.66036  
3.74355  
3.82674  
3.90993  
3.99312  
4.07631  
4.1595  
51.92304  
53.07688  
54.23073  
55.38458  
56.53842  
57.69227  
58.84611  
59.99996  
61.1538  
4.24269  
4.32588  
4.40907  
4.49226  
4.57545  
4.65864  
4.74183  
4.825021  
4.908211  
4.9914  
62.30765  
63.46149  
64.61533  
65.76918  
66.92304  
68.07688  
69.23072  
70.38457  
71.53841  
72.69226  
73.8461  
5.07459  
5.15778  
5.240971  
5.32416  
5.40735  
74.99994  
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Moisture Content at Temperature = 70°F (21.1ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
2.81925  
2.8998  
39.103  
40.22023  
41.33746  
42.45469  
43.57192  
44.68914  
45.80637  
46.9236  
2.98035  
3.0609  
3.14145  
3.222  
3.30255  
3.3831  
3.46365  
3.5442  
48.04083  
49.15806  
50.27529  
51.39252  
52.50975  
53.62697  
54.7442  
3.62475  
3.7053  
3.78585  
3.8664  
3.94695  
4.0275  
55.86143  
56.97866  
58.09588  
59.21311  
60.33035  
61.44757  
62.5648  
4.10805  
4.1886  
4.269151  
4.349701  
4.43025  
4.510801  
4.59135  
4.6719  
63.68203  
64.79925  
65.91648  
67.03371  
68.15094  
69.26818  
70.3854  
4.75245  
4.833  
4.91355  
4.994101  
5.074651  
5.1552  
71.50263  
72.61986  
5.23575  
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Moisture Content at Temperature = 69°F (20.6ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
2.7293  
37.85539  
38.93697  
40.01856  
41.10014  
42.18173  
43.2633  
2.80728  
2.88526  
2.96324  
3.04122  
3.1192  
3.19718  
3.27516  
3.35314  
3.43112  
3.5091  
44.34489  
45.42647  
46.50805  
47.58964  
48.67122  
49.7528  
3.58708  
3.66506  
3.74304  
3.82102  
3.899  
50.83438  
51.91596  
52.99755  
54.07913  
55.16072  
56.2423  
3.97698  
4.05496  
4.13294  
4.21092  
4.2889  
57.32389  
58.40546  
59.48704  
60.56863  
61.65021  
62.73179  
63.81338  
64.89496  
65.97653  
67.05811  
68.1397  
4.36688  
4.44486  
4.52284  
4.60082  
4.6788  
4.75678  
4.83476  
4.91274  
4.99072  
5.0687  
69.22128  
70.30286  
138  
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Moisture Content at Temperature = 68°F (20.0ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
2.64985  
2.72556  
2.80127  
2.87698  
2.95269  
3.0284  
36.75342  
37.80352  
38.85362  
39.90371  
40.95381  
42.00391  
43.05401  
44.10411  
45.1542  
3.10411  
3.17982  
3.25553  
3.33124  
3.40695  
3.48266  
3.55837  
3.63408  
3.70979  
3.7855  
46.2043  
47.2544  
48.30449  
49.35459  
50.40469  
51.45479  
52.50489  
53.55499  
54.60509  
55.65518  
56.70528  
57.75538  
58.80547  
59.85557  
60.90567  
61.95576  
63.00587  
64.05596  
65.10606  
66.15616  
67.20625  
68.25635  
3.86121  
3.93692  
4.01263  
4.08834  
4.16405  
4.23976  
4.31547  
4.39118  
4.46689  
4.5426  
4.61831  
4.694021  
4.76973  
4.84544  
4.92115  
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Moisture Content at Temperature = 67°F (19.4ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
2.5578  
35.47669  
36.49031  
37.50393  
38.51755  
39.53116  
40.54479  
41.5584  
2.63088  
2.70396  
2.77704  
2.85012  
2.9232  
2.99628  
3.06936  
3.14244  
3.21552  
3.2886  
42.57202  
43.58565  
44.59926  
45.61288  
46.62651  
47.64012  
48.65374  
49.66736  
50.68098  
51.6946  
3.36168  
3.43476  
3.50784  
3.58092  
3.654  
3.72708  
3.80016  
3.87324  
3.94632  
4.0194  
52.70822  
53.72184  
54.73546  
55.74908  
56.7627  
4.09248  
4.16556  
4.238641  
4.31172  
4.3848  
57.77632  
58.78994  
59.80356  
60.81718  
61.8308  
4.45788  
4.53096  
4.60404  
4.67712  
4.750201  
62.84442  
63.85804  
64.87166  
65.88528  
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Moisture Content at Temperature = 66°F (18.9ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
2.4759  
34.34073  
35.3219  
2.54664  
2.61738  
2.68812  
2.75886  
2.8296  
36.30306  
37.28422  
38.26539  
39.24655  
40.22772  
41.20888  
42.19005  
43.17121  
44.15237  
45.13354  
46.1147  
2.90034  
2.97108  
3.04182  
3.11256  
3.1833  
3.25404  
3.32478  
3.39552  
3.46626  
3.537  
47.09587  
48.07703  
49.05819  
50.03935  
51.02052  
52.00168  
52.98285  
53.96401  
54.94517  
55.92634  
56.9075  
3.60774  
3.67848  
3.74922  
3.81996  
3.8907  
3.96144  
4.03218  
4.10292  
4.17366  
4.2444  
57.88866  
58.86983  
59.85099  
60.83216  
61.81332  
62.79449  
63.77564  
4.31514  
4.38588  
4.45662  
4.52736  
4.5981  
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Moisture Content at Temperature = 65°F (18.3ºC)  
RH  
Grains Per Cu Ft  
Grains Per Lb.  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
2.39575  
2.4642  
2.53265  
2.6011  
2.66955  
2.738  
33.22905  
34.17846  
35.12785  
36.07726  
37.02666  
37.97606  
38.92546  
39.87486  
40.82426  
41.77366  
42.72307  
43.67247  
44.62187  
45.57127  
46.52067  
47.47008  
48.41947  
49.36888  
50.31828  
51.26768  
52.21708  
53.16648  
54.11589  
55.06528  
56.01469  
56.96409  
57.91349  
58.86289  
59.81229  
60.76169  
61.7111  
2.80645  
2.8749  
2.94335  
3.0118  
3.08025  
3.1487  
3.21715  
3.2856  
3.35405  
3.4225  
3.49095  
3.5594  
3.62785  
3.6963  
3.76475  
3.8332  
3.90165  
3.9701  
4.03855  
4.107  
4.17545  
4.2439  
4.31235  
4.3808  
4.44925  
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Suction Transducer Information (Codes A124-A128)  
%
psig  
psia  
volts barg bara  
-2.31 -1.29  
%
51  
psig  
62.2  
psia  
76.9  
volts barg  
bara  
4.29 5.30  
-33.5 -18.8  
-31.6 -16.9  
-29.7 -15.0  
-27.8 -13.1  
-26.0 -11.3  
-24.1  
-22.2  
-20.3  
-18.5  
-16.6  
-14.7  
-12.8  
-11.0  
-9.1  
-7.2  
-5.3  
-3.5  
-1.6  
0.3  
2.2  
4.1  
5.9  
0
2.55  
2.6  
2.65  
2.7  
2.75  
2.8  
2.85  
2.9  
2.95  
3
3.05  
3.1  
3.15  
3.2  
3.25  
3.3  
3.35  
3.4  
3.45  
3.5  
3.55  
3.6  
3.65  
3.7  
3.75  
3.8  
3.85  
3.9  
3.95  
4
4.05  
4.1  
0
1
2
3
4
5
6
7
8
9
0.05 -2.18 -1.16  
0.1 -2.05 -1.03  
0.15 -1.92 -0.90  
0.2 -1.79 -0.78  
0.25 -1.66 -0.65  
0.3 -1.53 -0.52  
0.35 -1.40 -0.39  
0.4 -1.27 -0.26  
0.45 -1.14 -0.13  
64.1  
65.9  
67.8  
69.7  
71.6  
73.4  
75.3  
77.2  
79.1  
80.9  
82.8  
84.7  
78.8  
80.6  
82.5  
84.4  
86.3  
88.1  
90.0  
91.9  
93.8  
95.6  
97.5  
99.4  
4.42  
4.55  
4.67  
4.80  
4.93  
5.06  
5.19  
5.32  
5.45  
5.58  
5.71  
5.84  
5.97  
6.10  
6.23  
6.36  
6.48  
6.61  
6.74  
6.87  
7.00  
7.13  
7.26  
7.39  
7.52  
7.65  
7.78  
7.91  
8.04  
8.16  
8.29  
8.42  
8.55  
8.68  
8.81  
8.94  
5.43  
5.56  
5.69  
5.82  
5.95  
6.08  
6.21  
6.33  
6.46  
6.59  
6.72  
6.85  
6.98  
7.11  
7.24  
7.37  
7.50  
7.63  
7.76  
7.89  
8.02  
8.14  
8.27  
8.40  
8.53  
8.66  
8.79  
8.92  
9.05  
9.18  
9.31  
9.44  
9.57  
9.70  
9.82  
9.95  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
80  
81  
82  
83  
84  
85  
86  
87  
88  
89  
90  
91  
92  
93  
94  
95  
96  
97  
98  
99  
100  
-9.4  
-7.5  
-5.6  
-3.8  
-1.9  
0.0  
1.9  
3.8  
5.6  
7.5  
0.5 -1.01  
0.55 -0.88  
0.6 -0.75  
0.65 -0.63  
0.7 -0.50  
0.75 -0.37  
0.8 -0.24  
0.85 -0.11  
0.00  
0.13  
0.26  
0.39  
0.52  
0.65  
0.78  
0.90  
1.03  
1.16  
1.29  
1.42  
1.55  
1.68  
1.81  
1.94  
2.07  
2.20  
2.33  
2.46  
2.59  
2.71  
2.84  
2.97  
3.10  
3.23  
3.36  
3.49  
3.62  
3.75  
3.88  
4.01  
4.14  
4.27  
4.40  
4.52  
4.65  
4.78  
4.91  
5.04  
5.17  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
86.6 101.3  
88.4 103.1  
90.3 105.0  
92.2 106.9  
94.1 108.8  
95.9 110.6  
97.8 112.5  
99.7 114.4  
101.6 116.3  
103.4 118.1  
105.3 120.0  
107.2 121.9  
109.1 123.8  
110.9 125.6  
112.8 127.5  
114.7 129.4  
116.6 131.3  
118.4 133.1  
120.3 135.0  
122.2 136.9  
124.1 138.8  
125.9 140.6  
127.8 142.5  
129.7 144.4  
131.6 146.3  
133.4 148.1  
135.3 150.0  
137.2 151.9  
139.1 153.8  
140.9 155.6  
142.8 157.5  
144.7 159.4  
146.6 161.3  
148.4 163.1  
150.3 165.0  
152.2 166.9  
154.1 168.8  
9.4  
11.3  
13.1  
15.0  
16.9  
18.8  
20.6  
22.5  
24.4  
26.3  
28.1  
30.0  
31.9  
33.8  
35.6  
37.5  
39.4  
41.3  
43.1  
45.0  
46.9  
48.8  
50.6  
52.5  
54.4  
56.3  
58.1  
60.0  
61.9  
63.8  
65.6  
67.5  
69.4  
71.3  
73.1  
75.0  
0.9  
0.95  
1
0.02  
0.15  
0.28  
0.41  
0.54  
0.67  
0.80  
0.93  
1.05  
1.18  
1.31  
1.44  
1.57  
1.70  
1.83  
1.96  
2.09  
2.22  
2.35  
2.48  
2.61  
2.74  
2.86  
2.99  
3.12  
3.25  
3.38  
3.51  
3.64  
3.77  
3.90  
4.03  
4.16  
1.05  
1.1  
1.15  
1.2  
7.8  
9.7  
11.6  
13.4  
15.3  
17.2  
19.1  
20.9  
22.8  
24.7  
26.6  
28.4  
30.3  
32.2  
34.1  
35.9  
37.8  
39.7  
41.6  
43.4  
45.3  
47.2  
49.1  
50.9  
52.8  
54.7  
56.6  
58.4  
60.3  
1.25  
1.3  
1.35  
1.4  
1.45  
1.5  
1.55  
1.6  
4.15  
4.2  
4.25  
4.3  
4.35  
4.4  
1.65  
1.7  
1.75  
1.8  
1.85  
1.9  
1.95  
2
9.07 10.08  
9.20 10.21  
9.33 10.34  
9.46 10.47  
9.59 10.60  
9.72 10.73  
9.85 10.86  
9.97 10.99  
4.45  
4.5  
4.55  
4.6  
4.65  
4.7  
4.75  
2.05  
2.1  
2.15  
2.2  
2.25  
2.3  
2.35  
2.4  
4.8 10.10 11.12  
4.85 10.23 11.25  
4.9 10.36 11.38  
4.95 10.49 11.51  
2.45  
2.5  
5
10.62 11.63  
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Digital Scroll High Temperature Sensor Chart  
NTC (Code S606 and S608)  
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Unit Code Description  
The iCOM controller uses a system parameters auto configuration methodology.  
The unit will have a code on a serial tag displayed on the front of the electric  
panel. This code when entered during the factory QA process will define unit  
configuration and auto set various parameters for functionality. The sheets in the  
back of this manual will allow the service technician to understand and be able to  
enter this unit code manually if necessary through the control panel and  
the FACTORY SETTINGS parameter. The parameter codes are listed in Chapter  
as A001 to A011. The UNIT CODE ID numbers must be entered in groups of six at  
a time. When all ID numbers of the UNIT CODE are entered user must select  
A008 to “Send and Execute Unit Code” then verify parameter code A011 for a  
“VALID” status. If UNIT CODE is missing or lost the unit will not start until the  
correct code is entered and saved.  
The UNIT CODE sheets will show a VALUE field on the left of the first page and  
followed by 18 columns of unit configuration definitions.  
THIS UNIT CODE IS NOT TO BE CHANGED UNLESS INSTRUCTED BY A  
FACTORY SERVICE TECHNICIAN.  
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Troubleshooting Checklist  
1. Check the obvious before beginning troubleshooting.  
A. Be sure that a remote control switch has not been shut off.  
B. Be sure that the communication cable is properly connected.  
C. Be sure that power is reaching all modules associated with the system.  
2. Power down the entire unit during the process of removing or replacing any  
component or cable.  
A. Serious damage to components may result if this step is not taken.  
B. After removal or replacement actions, power may be restored to the unit.  
3. Wear a personal ground strap when handling printed circuit boards or  
associated connecting cables. Static electricity, besides being annoying, can  
damage delicate electronic components.  
4. Protect exposed components from accidental contact by personnel or dropped  
hardware or tools.  
5. When checking voltage, use the correct reference (ground) points. The  
chassis is not always the correct ground point, especially within the electronic  
housing.  
6. Reassemble modules correctly.  
A. Observe assembled appearance prior to disassembly.  
B. Replace all hardware (especially insulating or nylon hardware) in the same  
places and in the same relationship as the original.  
7. When advised to check and replace cables, do the following:  
A. Inspect for damaged insulation, broken conductors, and/or loose  
connectors.  
B. Check continuity with an ohm meter (Flex cable while checking.).  
C. Make certain that connectors mate firmly with proper receptacles.  
8. When changing set points to cause a call for heating or cooling, set the points  
at least 10°-15° above (for heating) or below (for cooling) the present room  
temperature.  
9. Bring the room temperature level to within the working range of the equipment  
(35°-90°F) before attempting troubleshooting.  
10. Bring the room humidity level to within the working range of the equipment  
(35%-65%) before attempting troubleshooting.  
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Glossary of Unit and System Parameters  
User Menu  
Code Setpoints  
Type  
Unit  
Unit  
Unit  
Unit  
U102 Temperature setpoint  
U103 Humidity setpoint  
U104 Predictive Humidity control  
U105 Supply Limit  
U106 Supply Limit Value  
Graphics  
Unit  
Type  
System  
System  
System  
System  
Unit  
System temperature time scale  
System temperature graph height  
System humidity time scale  
System humidity graph height  
Unit temperature time scale  
Unit temperature graph height  
Unit humidity time scale  
Unit  
Unit  
Unit humidity graph height  
Code Set Alarms  
U202 Std. Sensor Alarms  
U203 High temperature  
U204 Low temperature  
U205 High humidity  
Unit  
Type  
Unit  
Unit  
Unit  
Unit  
U206 Low humidity  
Unit  
U207 Sensor A Alarms  
U208 High temperature sensor A  
U209 Low temperature sensor A  
U210 High humidity sensor A  
U211 Low humidity sensor A  
Unit  
Unit  
Unit  
Unit  
Unit  
Code  
Various Sensors  
Type  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
U301 Actual temperature setpoint  
U302 Actual humidity setpoint  
U303 Optional sensor A temperature  
U304 Optional sensor A humidity  
U305 Optional sensor B temperature  
U306 Optional sensor B humidity  
U307 Optional sensor C temperature  
U308 Optional sensor C humidity  
U309 Glycol temperature  
Unit  
U310 DigiScroll 1 temperature  
U311 DigiScroll 2 temperature  
U312 Freecooling status  
Unit  
Unit  
Unit  
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Code Display Setup  
U401 Language  
U402 Date  
Type  
Display  
Unit  
U403 Time  
Unit  
U404 Temperature Indication  
U405 Display contrast  
U406 Buzzer Frequency  
U407 Backlight off after x hours  
U408 Screen:  
U409 Display shows:  
U410 Display View  
Code Total Run Hours  
U502 Fan Motor  
Unit  
Display  
Display  
Display  
Display  
Display  
Display  
Type  
Unit  
U502 Fan Motor Limit  
U503 Compressor 1  
U503 Compressor 1 Limit  
U504 Compressor 2  
U504 Compressor 2 Limit  
U505 Freecooling  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
U505 Freecooling Limit  
U506 Hotgas / Hotwater  
U506 Hotgas / Hotwater Limit  
U507 Electrical Heater 1  
U507 Electrical Heater 1 Limit  
U508 Electrical Heater 2  
U508 Electrical Heater 2 Limit  
U509 Electrical Heater 3  
U509 Electrical Heater 3 Limit  
U510 Humidifier  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
U510 Humidifier Limit  
U511 Dehumidification  
U511 Dehumidification Limit  
Code Timer  
Unit  
Unit  
Unit  
Type  
Unit  
U603 Monday  
U603 Tuesday  
Unit  
U603 Wednesday  
Unit  
U603 Thursday  
Unit  
U603 Friday  
Unit  
U603 Saturday  
Unit  
U603 Sunday  
Unit  
U605 From / to  
Unit  
U607 From / to  
Unit  
U609 Timer mode  
Unit  
U610 Timer Mode Type  
U611 Deadband  
Unit  
Unit  
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Code Service contacts  
U703 Address line 1  
U704 Address line 2  
U705 Address line 3  
U706 Address line 4  
Type  
System  
System  
System  
System  
Service Menu  
Code Setpoints  
Type  
Unit  
Unit  
S102 Temperature setpoint  
S103 Humidity setpoint  
S104 Predictive Humidity control  
S105 Supply Limit  
Unit  
Unit  
S106 Supply Limit Value  
Unit  
S107 Autoset enable  
Unit  
S108 Temperature proportional band  
S109 Temperature integration time  
S110 Temperature deadband  
S113 Humidity proportional band  
S114 Humidity integration time  
S115 Humidity deadband  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
S116 DT between Room / Glycol Type  
S117 DT between Room / Glycol Value  
S118 Min.Chilled Water Temp. Enable  
S119 Min.Chilled Water Temp. Value  
Code Standby settings / Lead-lag  
S502 Number of standby units  
S503 Rotation Frequency  
Unit  
Unit  
Unit  
Unit  
Type  
System  
System  
S504 Rotate at (hour)  
S505 Rotate at (minute)  
S506 Rotate by  
S507 Perform one rotation  
S508 Cascade units  
Code Wellness / General Settings  
S002 Maintenance frequency  
S003 Max bonus  
System  
System  
System  
System  
System  
Type  
System  
System  
System  
System  
System  
System  
System  
S004 Max penalty  
S005 Last maintenance  
S006 Service engineer  
S007 Reset  
S008 Calculated next maintenance  
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Fan Settings  
S013 Number of starts  
S014 Working hours  
S015 Average working time  
S016 Starts per day optimum  
S017 Starts per day worst  
S018 Number of alarms  
S019 Actual bonus  
Type  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Type  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Type  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Type  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Type  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Compr. 1 Settings  
S024 Number of starts  
S025 Working hours  
S026 Average working time  
S027 Starts per day optimum  
S028 Starts per day worst  
S029 Number of HP alarms  
S030 Number of LP alarms  
S031 Number of TH alarms  
S032 Number of HT alarms  
S033 Actual bonus  
Compr. 2 Settings  
S035 Number of starts  
S036 Working hours  
S037 Average working time  
S038 Starts per day optimum  
S039 Starts per day worst  
S040 Number of HP alarms  
S041 Number of LP alarms  
S042 Number of TH alarms  
S043 Number of HT alarms  
S044 Actual bonus  
El. Heater 1 Settings  
S046 Number of starts  
S047 Working hours  
S048 Average working time  
S049 Starts per day optimum  
S050 Starts per day worst  
S051 Number of alarms  
S052 Actual bonus  
El. Heater 2 Settings  
S057 Number of starts  
S058 Working hours  
S059 Average working time  
S060 Starts per day optimum  
S061 Starts per day worst  
S062 Number of alarms  
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S063 Actual bonus  
El. Heater 3 Settings  
Unit  
Type  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Type  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Type  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
S068 Number of starts  
S069 Working hours  
S070 Average working time  
S071 Starts per day optimum  
S072 Starts per day worst  
S073 Number of alarms  
S074 Actual bonus  
Humidifier Settings  
S079 Number of starts  
S080 Working hours  
S081 Average working time  
S082 Starts per day optimum  
S083 Starts per day worst  
S084 Number of alarms  
S085 Actual bonus  
Code Diagnostics / Service  
S302 Manual Mode  
S303 Unit Fan  
S304 Compressor 1  
S304 Compressor 1 (Mode)  
S305 Compressor 1 capacity  
S306 Compressor 1 cycle ramp  
S307 Compressor 2  
S307 Compressor 2 (Mode)  
S308 Compressor 2 capacity  
S309 Compressor 2 cycle ramp  
S313 Heat 1  
S314 Heat 2  
S315 Heat 3  
S324 Hum Fill  
S325 Hum  
S326 Alarm Relay  
S327 R5  
S328 3P actuator open  
S329 3P actuator close  
S330 Analog out 1  
S331 Analog out 2  
S332 Analog out 3  
S333 Analog out 4  
S335 Status Remote  
S336 Status Air Sail  
S337 Status Fan Overload  
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S338 Status Filter  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Type  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Type  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
S339 Status Customer Input 1  
S340 Status Customer Input 2  
S341 Status Customer Input 3  
S342 Status Customer Input 4  
S343 HP 1 alarm counter per 12 hours  
S344 HP 2 alarm counter per 12 hours  
S346 Status HP 1  
S347 Status LP 1  
S348 Status TH 1  
S349 Status HP 2  
S350 Status LP 2  
S351 Status TH 2  
S352 Status Humidifier Problem  
S353 Status DT 2  
S354 Status Min CW  
Code Set Alarms  
S202 Std. Sensor Alarms  
S203 High temperature  
S204 Low temperature  
S205 High humidity  
S206 Low humidity  
S207 Sensor A Alarms  
S208 High temperature sensor A  
S209 Low temperature sensor A  
S210 High humidity sensor A  
S211 Low humidity sensor A  
S213 Customer Input 1  
S214 Customer Input 1 active when  
S215 Customer Input 2  
S216 Customer Input 2 active when  
S217 Customer Input 3  
S218 Customer Input 3 active when  
S219 Customer Input 4  
S220 Customer Input 4 active when  
Code Sensor Calibration  
S602 Return temperature  
S603 Calibrated Return temperature  
S604 Return humidity  
S605 Calibrated return humidity  
S606 DigiScroll 1 NTC  
S607 Calibrated DigiScroll 1 NTC  
S608 DigiScroll 2 NTC  
S609 Calibrated DigiScroll 2 NTC  
S613 Temperature Sensor A  
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S614 Calibrated Temp. Sensor A  
S615 Humidity Sensor A  
S616 Calibrated Humidity Sensor A  
S617 Temperature Sensor B  
S618 Calibrated Temp. Sensor B  
S619 Humidity Sensor B  
S620 Calibrated Humidity Sensor B  
S624 Glycol Sensor PTC or NTC  
S625 Glycol Sensor  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
S626 Calibrated Glycol Sensor  
S627 Supply Sensor PTC or NTC  
S628 Supply Sensor  
Unit  
Unit  
Unit  
S629 Calibrated Supply Sensor  
S630 Temperature Sensor C  
S631 Calibrated Temp. Sensor C  
S632 Humidity Sensor C  
S633 Calibrated Humidity Sensor C  
Code System / Network Setup  
S802 Number of connected units  
S803 Teamwork Mode  
S804 IP Address  
S805 Netmask  
S806 Gateway  
S807 MAC  
S808 U2U Address  
S809 U2U Protocol  
S810 U2U Group  
S811 SW Version  
S813 Monitoring Address  
S814 Monitoring Protocol  
S815 IP Address  
Unit  
Unit  
Unit  
Unit  
Unit  
Type  
System  
System  
System  
System  
System  
System  
System  
System  
System  
System  
Unit  
Unit  
Unit  
S816 Netmask  
Unit  
S817 Gateway  
Unit  
S818 MAC  
Unit  
S819 U2U Address  
Unit  
S820 U2U Protocol  
Unit  
S821 U2U Group  
Unit  
S822 SW Version  
Unit  
Code Options Setup  
Type  
Unit  
Unit  
S402 Compressor sequence  
S403 Low pressure alarm delay  
S404 Actual LP1 pressure  
Unit  
S405 Actual LP2 pressure  
S406 Number of all heat stages  
Unit  
Unit  
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S407 Electrical  
S408 Hot water On/Off  
S409 Hot gas  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
S410 3P actuator runtime  
S411 3P actuator direction  
S413 Humidification enabled  
S414 Infrared Flush Rate  
S415 Dehum enabled  
S416 Electric reheat operation  
Code Service contacts  
S702 Country  
S703 Address line 1  
S704 Address line 2  
S705 Address line 3  
S706 Address line 4  
Unit  
Unit  
Type  
System  
System  
System  
System  
System  
Advanced Menu  
Code Factory Settings  
A002 Unit Code Field: (01-06)  
A003 Set Code: (01-06)  
A004 Unit Code Field: (7-12)  
A005 Set Code: (7-12)  
Type  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
A006 Unit Code Field: (13-18)  
A007 Set Code: (13-18)  
A008 Send and Execute Unit Code  
A009 Load and Execute XML Code  
A010 Check XML Unit Code  
A011 Status Unit Code  
A102 Refrigerant Type  
A103 Main Fan Overload  
Loss of Airflow  
A104  
A105 Number of compressors  
A106 Compressor delay time  
A107 Compressor min on time  
A108 Compressor min off time  
A109 Pump down  
Unit  
Unit  
System  
System  
Unit  
A110 Capacity Ctrl.  
Unit  
A113 Digi Scroll Cycle  
A114 High temperature Digi Scroll  
A115 Digi Scroll switchback  
A116 Low pressure device  
Unit  
Unit  
Unit  
Unit  
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A117 Low pressure threshold Phase 1  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
A118 Low pressure threshold Phase 2  
A124 LP1 sensor 0% =  
A124 LP1 sensor 0% =  
A125 LP1 sensor 100% =  
A125 LP1 sensor 100% =  
A126 Actual LP1 signal  
A127 LP2 sensor 0% =  
A127 LP2 sensor 0% =  
A128 LP2 sensor 100% =  
A128 LP2 sensor 100% =  
A129 Actual LP2 signal  
A130 Pump down cutout  
A131 Pump down recycle  
A132 Condenser Control  
A135 CW flush  
A136 CW flush duration  
A137 Freecooling  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
Unit  
A138 Freecooling flush  
A139 Freecooling flush duration  
A140 Freecooling flush starts R5  
A141 CO + FC simultaneously  
A142 Hot water flush  
A143 Hot water flush duration  
A146 Humidifier Model  
A147 Humidity in Last xx Hours  
A148 Prefill Time  
A149 Fill Time  
A150 Humidifier On Time  
A151 Dehum with compressor  
A152 Analog output 1  
A153 Analog output 2  
A154 Analog output 3  
Unit  
Unit  
A155 Analog output 4  
Unit  
Code Access  
Type  
A201 Password Level 1 (User)  
A202 Password Level 2 (Service)  
A203 Password Level 3 (Advanced)  
System  
System  
System  
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Glossary of Terms  
Address: A pattern of characters that identifies a unique storage location  
Algorithm: A set of procedures to obtain a given result  
Ambient: Condition on immediately surrounding atmosphere or area: usually  
refers to temperature or pressure  
Analog: Refers to circuitry; also called linear circuitry; circuitry that varies certain  
properties or electricity continuously and smoothly over a range  
Anti-Static Material: A slightly conductive material that allows the net charge to  
be drained off through a path; an electrostatic protective material having a surface  
resistively greater than 104 but not greater than 109 Ohms per square inch (does  
not generate static electricity)  
Binary Number System or Binary Code: A method of writing numbers by using  
two digits, 0 and 1  
Bit: The smallest possible piece of information; a specification of one of two  
possible conditions. (Bits are written as 1 for yes and 0 for no.)  
Bus: Large trace or foil extending around the edge of a PCB to provide  
conduction for several sources  
Byte: A set of adjacent binary digits operated upon as a unit (usually 8 bits)  
Charge: The product of capacitance times voltage  
CMOS: Complimentary Metal Oxide Substrate semiconductor  
Computer: At least one CPU together with input, output, control switch buttons  
and memory units  
Conductive Material: Material that conducts electrical charge (Because it  
conducts charge, there is no potential difference across or storage of a static  
charge.); electrostatic protective material having a maximum surface resistivity of  
10 Ohms per square unit, or a maximum volume resistivity of 10 Ohms/cm.  
Control Buttons: Push buttons on the display bezels to operate the  
increase/decrease, advance, or silence functions  
Control Switches: Sometimes called dip switches and used for additional  
programming features on all levels  
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CPU: Central Processing Unit; the part of a computer system that contains the  
main storage, arithmetic unit and special register groups (It performs arithmetic  
operations, controls instruction processing and provides timing signals.)  
Data: Another name for information  
Data Bus: One method of input/output for a system where data is moved by way  
of a group of wires forming a common bus  
Decrease Button: Control button used to decrease values  
Digital: Information in discrete or quantified form, not continuous  
DIP: Dual Inline Package; a type of Integrated Circuit (IC)  
DIP Switch: Type of electronic switch having multiple, manually selectable  
settings  
Earth ground: The portion of an electrical circuit that is at zero potential with  
respect to the earth  
Electrostatic Field: The field around an electrostatically charged object  
Electrostatic Voltage: Voltage generated by the sliding, rubbing or separating  
action between materials  
EPROM: Erasable and Programmable Read-Only Memory; an integrated circuit  
memory chip whose stored data can be read at random (Data can be erased and  
new data can be stored.)  
ESDS: ElectroStatic Discharge Sensitive; sensitive to electrostatic voltage of  
4000 volts or less as determined by the human test circuit  
Fill Period: The period during which the humidifier pan is filled from a partially  
filled state to the level required for optimum humidification  
Firmware: Software stored in EPROM or PROM  
Hard Ground: A direct connection to earthground (also refer to soft ground)  
Hardware: The PCB, cable, switches and associated devices  
Hysteresis: Differential  
IC: Integrated Circuit; an assembly that consists of all the necessary parts of an  
electronic circuit  
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Impedance: Opposition that a circuit offers to the flow of current through it,  
measured in Ohms  
Input: An incoming information signal  
Isolation: Separation of one device or environment from the effects of an  
adjacent or connected device or environment  
Lead Compressor: Compressor coming on first as a result of a call for  
Cooling 1  
Lag Compressor: Compressor coming on second as a result of a call for Cooling  
2
LED: Light Emitting Diode; a semiconductor that emits light when electric current  
is passed through it by way of two terminals  
Manual Override: A means of bypassing triac switches at all levels for manual  
operation of system components for test or emergency  
Memory: In a digital system, the part of the system where information is stored  
Microprocessor: An Integrated Circuit (IC, or set of a few ICs) that can be  
programmed with stored instructions to perform a wide variety of functions (A  
microprocessor consists of at least a controller, some registers and some sort of  
Arithmetic Logic Unit (ALU).  
N-Type Semiconductor: Semiconductor crystal doped to have an excess of free  
electrons with a predominately negative current carrying capacity (also referred to  
as a P-Type Semiconductor).  
Off Time: The time since humidification was last on  
Output: An outgoing information signal  
P-N-Junction: Interface boundary between two semiconductor regions with  
differing electrical properties (Current only flows across the junction in the forward  
direction if circuit voltage exceeds a certain threshold. Current cannot flow across  
the junction in the reverse direction.)  
P-Type Semiconductor: Semiconductor crystal doped for an excess of holes to  
enable heavier positive current-carrying capacity (also referred to as an N-Type  
Semiconductor).  
PCB: Printed Circuit Board; made of insulating material with conducting paths  
secured to one or both sides  
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Prefill: The period of time between when the water begins to fill the pan and the  
humidifier lamps turn on  
Program: A set of instructions to achieve a certain result  
PROM: Programmable Read-Only Memory; an Integrated Circuit (IC) memory  
chip whose stored data can be read at random (The IC can be used only one  
time.)  
RAM: Random-Access Memory where work can be written (stored) or read  
(recovered) in any order  
Remote: Component(s) or control(s) located at a distance away from the main  
components or controls  
Reset: To return a control to its original position  
ROM: Read-Only Memory: the location reserved for data permanently stored by  
the manufacturer  
Soft Ground: A connection to ground through an impedance sufficiently high to  
limit current flow to safe levels for personnel (Impedance needed for a soft ground  
is dependent upon the voltage levels that can be contacted by personnel near the  
ground.)  
Software: A set of computer programs, procedures and possible associated  
documentation concerned with the operation of a data processing system  
Static-Dissipative Material: Electrostatic protective material having surface  
restiveness greater than 104 but not greater than 109 Ohms per square inch  
Static-Shielding Material: Material that does not allow spark energy or  
electrostatic fields to pass through or penetrate it  
Surface Resistivity: An inverse measure of the conductivity of a material and  
equal to the ratio of the potential gradient to the current per unit width of the  
surface where the potential gradient is measured in the direction of current flow in  
the material (Surface resistivity is numerically equal to the surface resistance  
between two electrodes forming opposite sides of a square. The size of the  
square is immaterial. Its value is measured in Ohms per square inch.)  
Transformer: Electromagnetic device for changing the voltage of an AC circuit by  
induction and/or isolating an AC circuit from its distribution  
Triboelectric Effect: The generation of static electricity on an object by contact,  
separation or friction  
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Computer and Network Terms  
Agent: A program that performs some information gathering or processing task in  
the background. Typically, an agent is given a very small and well-defined task.  
Although the theory behind agents has been around for some time, agents have  
become more prominent with the recent growth of the Internet. Many companies  
now sell software that enables you to configure an agent to search the Internet for  
certain types of information.  
In computer science, there is a school of thought that believes that the human  
mind essentially consists of thousands or millions of agents all working in parallel.  
To produce real artificial intelligence, this school holds, we should build computer  
systems that also contain many agents and systems for arbitrating among the  
agents' competing results.  
BOOTP: Short for Bootstrap Protocol, an Internet protocol that enables a diskless  
workstation to discover its own IP address, the IP address of a BOOTP server on  
the network, and a file to be loaded into memory to boot the machine. This  
enables the workstation to boot without requiring a hard or floppy disk drive. The  
protocol is defined by RFC 951.  
Cookie: A message given to a Web browser by a Web server. The browser  
stores the message in a text file called cookie.txt. The message is then sent back  
to the server each time the browser requests a page from the server. The main  
purpose of cookies is to identify users and possibly prepare customized Web  
pages for them. When you enter a Web site using cookies, you may be asked to  
fill out a form providing such information as your name and interests. This  
information is packaged into a cookie and sent to your Web browser who stores it  
for later use. The next time you go to the same Web site, your browser will send  
the cookie to the Web server. The server can use this information to present you  
with custom Web pages. So, for example, instead of seeing just a generic  
welcome page you might see a welcome page with your name on it.  
DHCP: Short for Dynamic Host Configuration Protocol, a protocol for assigning  
dynamic IP addresses to devices on a network. With dynamic addressing, a  
device can have a different IP address every time it connects to the network. In  
some systems, the device's IP address can even change while it is still connected.  
DHCP also supports a mix of static and dynamic IP addresses.  
Dynamic addressing simplifies network administration because the software keeps  
track of IP addresses rather than requiring an administrator to manage the task.  
This means that a new computer can be added to a network without the hassle of  
manually assigning it a unique IP address. Many ISPs use dynamic IP addressing  
for dial-up users. DHCP client support is built into Windows 95 and NT  
workstation. NT 4 server includes both client and server support.  
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Ethernet: A local-area network (LAN) architecture developed by Xerox  
Corporation in cooperation with DEC and Intel in 1976. Ethernet uses a bus or  
star topology and supports data transfer rates of 10 Mbps. The Ethernet  
specification served as the basis for the IEEE 802.3 standard, which specifies the  
physical and lower software layers. Ethernet uses the CSMA/CD access method  
to handle simultaneous demands. It is one of the most widely implemented LAN  
standards.  
A newer version of Ethernet, called 100Base-T (or Fast Ethernet), supports data  
transfer rates of 100 Mbps. And the newest version, Gigabit Ethernet supports  
data rates of 1 gigabit (1,000 megabits) per second.  
Internet: A global network connecting millions of computers. More than 100  
countries are linked into exchanges of data, news and opinions. Unlike online  
services, which are centrally controlled, the Internet is decentralized by design.  
Each Internet computer, called a host, is independent. Its operators can choose  
which Internet services to use and which local services to make available to the  
global Internet community. Remarkably, this anarchy by design works exceedingly  
well. There are a variety of ways to access the Internet. Most online services,  
such as America Online, offer access to some Internet services. It is also possible  
to gain access through a commercial Internet Service Provider (ISP).  
IP address: An identifier for a computer or device on a TCP/IP network.  
Networks using the TCP/IP protocol route messages based on the IP address of  
the destination. The format of an IP address is a 32-bit numeric address written as  
four numbers separated by periods. Each number can be zero to 255. For  
example, 1.160.10.240 could be an IP address. Within an isolated network, you  
can assign IP addresses at random as long as each one is unique. However,  
connecting a private network to the Internet requires using registered IP addresses  
(called Internet addresses) to avoid duplicates.  
The four numbers in an IP address are used in different ways to identify a  
particular network and a host on that network. The InterNIC Registration Service  
assigns Internet addresses from the following three classes.  
Class A - supports 16 million hosts on each of 127 networks  
Class B - supports 65,000 hosts on each of 16,000 networks  
Class C - supports 254 hosts on each of 2 million networks  
The number of unassigned Internet addresses is running out, so a new classless  
scheme called CIDR is gradually replacing the system based on classes A, B, and  
C and is tied to adoption of IPv6.  
Network: A group of two or more computer systems linked together. There are  
many types of computer networks, including:  
local-area networks (LANs): The computers are geographically close  
together (that is, in the same building).  
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wide-area networks (WANs): The computers are farther apart and are  
connected by telephone lines or radio waves.  
campus-area networks (CANs): The computers are within a limited  
geographic area, such as a campus or military base.  
metropolitan-area networks MANs): A data network designed for a town or  
city.  
home-area networks (HANs): A network contained within a user's home  
that connects a person's digital devices.  
In addition to these types, the following characteristics are also used to categorize  
different types of networks:  
topology: The geometric arrangement of a computer system. Common  
topologies include a bus, star, and ring. See the Network topology  
diagrams in the Quick Reference section.  
protocol: The protocol defines a common set of rules and signals that  
computers on the network use to communicate. One of the most popular  
protocols for LANs is called Ethernet. Another popular LAN protocol for  
PCs is the IBM token-ring network .  
architecture: Networks can be broadly classified as using either a peer-to-  
peer or client/server architecture.  
Computers on a network are sometimes called nodes. Computers and devices  
that allocate resources for a network are called servers.  
Network cross-over cable: A specially designed cable tin which the receive and  
transmit lines (input and output) are crossed. Used to connect two computers  
together or hubs. Also called a null modem cable using either RS-232 port  
connectors or RJ-45 connectors.  
Network interface card: Often abbreviated as NIC, an expansion board you  
insert into a computer so the computer can be connected to a network. Most NICs  
are designed for a particular type of network, protocol, and media, although some  
can serve multiple networks.  
Null-modem cable: A specially designed cable that allows you to connect two  
computers directly to each other via their communications ports (RS-232 ports).  
Null modems are particularly useful with portable computers because they enable  
the portable computer to exchange data with a larger system.  
Protocol: An agreed-upon format for transmitting data between two devices. The  
protocol determines the following:  
the type of error checking to be used  
data compression method, if any  
how the sending device will indicate that it has finished sending a message  
how the receiving device will indicate that it has received a message  
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There are a variety of standard protocols from which programmers can choose.  
Each has particular advantages and disadvantages; for example, some are  
simpler than others, some are more reliable, and some are faster. From a user's  
point of view, the only interesting aspect about protocols is that your computer or  
device must support the right ones if you want to communicate with other  
computers. The protocol can be implemented either in hardware or in software.  
RJ-45: Short for Registered Jack-45, an eight-wire connector used commonly to  
connect computers onto a local-area networks (LAN), especially Ethernets. RJ-  
45 connectors look similar to the ubiquitous RJ-11 connectors used for  
connecting telephone equipment, but they are somewhat wider.  
SNMP: Short for Simple Network Management Protocol, a set of protocols for  
managing complex networks. The first versions of SNMP were developed in the  
early 80s. SNMP works by sending messages, called protocol data units (PDUs),  
to different parts of a network. SNMP-compliant devices, called agents, store data  
about themselves in Management Information Bases (MIBs) and return this data to  
the SNMP requesters.  
SNMP 1 reports only whether a device is functioning properly. The industry has  
attempted to define a new set of protocols called SNMP 2 that would provide  
additional information, but the standardization efforts have not been successful.  
Instead, network managers have turned to a related technology called RMON that  
provides more detailed information about network usage.  
TCP/IP: Abbreviation for Transmission Control Protocol/Internet Protocol, the  
suite of communications protocols used to connect hosts on the Internet. TCP/IP  
uses several protocols, the two main ones being TCP and IP. TCP/IP is built into  
the UNIX operating system and is used by the Internet, making it the de facto  
standard for transmitting data over networks. Even network operating systems  
that have their own protocols, such as NetWare, also support TCP/IP.  
10BaseT: One of several adaptations of the Ethernet (IEEE 802.3) standard for  
Local Area Networks (LANs). The 10Base-T standard (also called Twisted Pair  
Ethernet) uses a twisted-pair cable with maximum lengths of 100 meters. The  
cable is thinner and more flexible than the coaxial cable used for the 10Base-2 or  
10Base-5 standards. Cables in the 10Base-T system connect with RJ-45  
connectors. A star topology is common with 12 or more computers connected  
directly to a hub or concentrator. The 10Base-T system operates at 10 Mbps and  
uses baseband transmission methods.  
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Understanding IP Addressing: Every computer that communicates over the  
Internet is assigned an IP address that uniquely identifies the device and  
distinguishes it from other computers on the Internet. An IP address consists of 32  
bits, often shown as 4 octets of numbers from 0-255 represented in decimal form  
instead of binary form. For example, the IP address 168.212.226.204 in binary  
form is: 10101000.11010100.11100010.11001100.  
But it is easier for us to remember decimals than it is to remember binary  
numbers, so we use decimals to represent the IP addresses when describing  
them. However, the binary number is important because that will determine which  
class of network the IP address belongs to. An IP address consists of two parts,  
one identifying the network and one identifying the node, or host. The Class of the  
address determines which part belongs to the network address and which part  
belongs to the node address. All nodes on a given network share the same  
network prefix but must have a unique host number.  
Class A Network: Binary address start with 0, therefore the decimal number can  
be anywhere from 1 to 126. The first 8 bits (the first octet) identify the network and  
the remaining 24 bits indicate the host within the network. An example of a Class  
A IP address is 102.168.212.226, where "102" identifies the network and  
"168.212.226" identifies the host on that network.  
Class B Network: Binary addresses start with 10, therefore the decimal number  
can be anywhere from 128 to 191 (the number 127 is reserved for loopback and is  
used for internal testing on the local machine). The first 16 bits (the first two  
octets) identify the network and the remaining 16 bits indicate the host within the  
network. An example of a Class B IP address is 168.212.226.204 where  
"168.212" identifies the network and "226.204" identifies the host on that network.  
Class C Network: Binary addresses start with 110, therefore the decimal number  
can be anywhere from 192 to 223. The first 24 bits (the first three octets) identify  
the network and the remaining 8 bits indicate the host within the network. An  
example of a Class C IP address is 200.168.212.226 where "200.168.212"  
identifies the network and "226" identifies the host on that network.  
Class D Network: Binary addresses start with 1110, therefore the decimal number  
can be anywhere from 224 to 239. Class D networks are used to support  
multicasting.  
Class E Network: Binary addresses start with 1111, therefore the decimal number  
can be anywhere from 240 to 255. Class E networks are used for  
experimentation. They have never been documented or utilized in a standard  
way.  
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Network Information  
Commonly known as: Network wire, Ethernet cable, Cat5 cable, the information  
following will explain the connectivity for Liebert Environmental units.  
Fundamentally, this section will explain the terms of networking so that you can  
apply the information to building your own network. The parts and components  
are discussed in generic fashion since equipment manufacturers and price range  
of the equipment varies and changes on an almost daily basis. However, the  
terms themselves stay relatively consistent, so purchasing or discussing your  
needs with networking personnel remains the same.  
What is networking?…  
In it’s simplest form, a network can be created when 2 units are connected through  
communication wires. This simple connection requires a special “crossover” cable  
which “crosses” the receive and transmit lines (hence, the name of the cable) and  
is readily available at your local computer store. However, for most applications,  
the simpler and more generic installation requires network cables and a hub or  
switch as explained below.  
NETWORK CABLING  
Twisted Pair Ethernet (10baseT), sometime also called "UTP" from "Unshielded  
Twisted Pair", is based on using a cable and connectors similar to phone-wiring.  
The cable is connected via an RJ-45 connectors to the network connection  
installed in the Air Unit. The wire itself is generally called Category 5 wire.  
Category 5 cable  
RJ-45  
UTP connector  
HUBS AND SWITCHES  
The opposite end of the network cable connects  
each Air Unit to the "hub" or “switch”: these devices  
amplify and distribute the signal to other connected  
units. Switches and hubs range in prices from $20  
to thousands depending on the application. Most  
businesses have standardized on their networking equipment, so there is one  
probably already installed. Hubs are like mechanical devices where the  
connections themselves are automatically switched, allowing you to “bus” 2 or  
more devices easily. In a hub, only 1 device can communicate at a time.  
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Switches perform the same mechanical function, but they also include software  
inside that allows communication to operate at faster speeds and allow for multiple  
unit communication. Switches are the latest technology, but you are safe to use  
either device.  
g
d
i
i
t
a l  
Twisted pair - 10baseT - UTP Cable  
Hubs are available in different  
configuration, with 4, 8, 12, 15 or 24 RJ-  
45 connections. You can plug in the  
RJ45-connector into a hub while the  
network is running on the other connected  
systems, allowing you to move / add  
192.168.168.3  
192.168.168.2  
192.168.168.1  
systems without having to shutdown the network.  
As network grow, you may need a second hub:  
UNIT IDENTIFICATION OR ADDRESSING  
The units are separated and identified through their TCP/IP address. TCP/IP  
refers to the protocol or language being used to communicate between the  
Environmental Units. The addresses are arranged in 32-bit numbers. To make it  
easier to memorize such IP-addresses, they are usually expressed as 4 8-bit  
numbers (example: 192.168.10.1), where each of the 4 numbers is within the  
range of '0' to '255' (there are restriction on using '0' and '255', avoid using them.)  
When setting up a small private network, you are free to use ANY IP-  
address, however, when you are connected to a company network, you need  
to ask the Network-administrator to assign you an IP-address. And if you are  
connected to the Internet, your ISP (Internet Service Provider) will assign an  
IP-address to you.  
Even if a network is NOT connected to the Internet, it has become custom to use  
on private networks a range of IP-addresses, which are reserved for private  
networks (that makes it later possible to connect your private network to the  
Internet without having to re-configure everything). The reserved IP-address is:  
192.168.x.y, where x=same number on all systems and y=different/unique number  
on all systems.  
See the example above under HUBS AND SWITCHES for an example of this  
configuration.  
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How To Use The Schematics  
As you look at the outside edge of the electrical schematic (drawing), you will see  
the numbers 8 through 1 (reading left to right) across the top and bottom and the  
letters D through A (reading from top to bottom) along both the left and right edges  
of the schematic. These numbers and letters are called locators, just like on a  
map. By intersecting the number and letter into the drawing, you can locate the  
section of the schematic you need to reference.  
The next area of interest is the line numbers along both sides of the schematic.  
By using these line numbers and a straight edge, you can pinpoint a particular  
item in the located section. Also, useful is the Nomenclature section along the  
right side of the schematic. The nomenclature sections refers identifies the device  
by abbreviation and name and indicates on which line the device is found.  
If you look deep into the schematic, you can see that the transformer section is  
laid out in a ladder progression making it easy to follow-out each circuit. You may  
wish to highlight each circuit with a marker making it easy to follow.  
The number indicators in the area to the right of the ladder circuit section are also  
important. These are the contact locators for each relay or contactor shown on the  
drawing. The number represents the line location of the contact(s) for the adjacent  
shown relay or contactor. There are two types of line number indicators. One is  
highlighted with a bar across the top of the number, this indicates a normally  
closed contact. The other number shown without the bar indicates a normally  
open contact. Remember that the drawing is shown in the non-powered (de-  
energized) state.  
These drawings are the latest revisions at publication of this manual and are what  
Liebert calls Universal drawings. Liebert has included numerous options on each  
one of these drawing to help in troubleshooting the system. These drawings may  
or may not be on your particular unit.  
It is important to become familiar with legend, nomenclature and notes on each  
drawing.  
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Electrical Schematics  
Liebert DS iCOM Global Control 8 - 12 Ton  
182769  
182770  
182771  
182772  
Liebert DS iCOM Global Control 15 – 30 Ton, 380 – 575V  
Liebert DS iCOM Global Control 15 – 30 Ton, 200 – 230V  
Liebert DS iCOM Global Control 8 - 12 Ton, SCR Reheat  
182952 Connection Drawing Liebert DS  
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Notes  
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