Siemens Bacnet 125 5037 User Manual

Siemens BACnet  
VAV Actuator  
Owner’s Manual  
125-5037  
Rev. AA, February 2008  
Rev. AA, February 2008  
NOTICE  
The information contained within this document is subject to change without notice and should not be construed as a  
commitment by Siemens Building Technologies, Inc. Siemens Building Technologies, Inc. assumes no responsibility  
for any errors that may appear in this document.  
All software described in this document is furnished under a license and may be used or copied only in accordance  
with the terms of such license.  
WARNING  
This equipment generates, uses, and can radiate radio frequency energy and if not installed and used in accordance  
with the instructions manual, may cause interference to radio communications. It has been tested and found to  
comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to  
provide reasonable protection against such interference when operated in a commercial environment. Operation of  
this equipment in a residential area is likely to cause interference in which case users at their own expense will be  
required to take whatever measures may be required to correct the interference.  
SERVICE STATEMENT  
Control devices are combined to make a system. Each control device is mechanical in nature and all mechanical  
components must be regularly serviced to optimize their operation. All Siemens Building Technologies branch offices  
and authorized distributors offer Technical Support Programs that will ensure your continuous, trouble-free system  
performance.  
For further information, contact your nearest Siemens Building Technologies, Inc. representative.  
Copyright 2008 by Siemens Building Technologies, Inc.  
TO THE READER  
Your feedback is important to us. If you have comments about this document, please send them to  
CREDITS  
Product or company names mentioned herein may be the trademarks of their respective owners.  
Country of Origin: US  
Table of Contents  
How To Use This Manual..............................................................................................V  
Manual Organzation......................................................................................................V  
Manual Conventions.....................................................................................................VI  
Manual Symbols............................................................................................................VI  
Getting Help...................................................................................................................VI  
Where To Send Comments ..........................................................................................VI  
Product Overview .........................................................................................................1  
Introduction ................................................................................................................1  
Ordering Notes........................................................................................................1  
Hardware Inputs ........................................................................................................2  
Analog .....................................................................................................................2  
Digital ......................................................................................................................2  
Hardware Outputs......................................................................................................2  
Analog .....................................................................................................................2  
Digital ......................................................................................................................3  
Power Wiring...........................................................................................................3  
Communication Wiring............................................................................................4  
Controller LED Indicators........................................................................................4  
Temperature Sensors................................................................................................4  
Room Temperature Sensor.....................................................................................4  
Duct Temperature Sensor.......................................................................................5  
Related Equipment..................................................................................................5  
Applications...................................................................................................................6  
Basic Operation .........................................................................................................6  
Sequencing Logic (optional) ......................................................................................6  
Control Temperature Setpoints..................................................................................6  
Day/Night Mode .........................................................................................................6  
Night Mode Override Switch......................................................................................6  
Control Loops.............................................................................................................6  
Calibration..................................................................................................................7  
Damper Status Operation..........................................................................................7  
Siemens Building Technologies, Inc.  
I
Table of Contents  
Fail-safe Operation ....................................................................................................7  
Heating and Cooling Switchover ...............................................................................7  
Modulate Damper During Heating Mode (optional)...................................................7  
Hot Water Reheat......................................................................................................8  
Electric Reheat...........................................................................................................8  
Notes..........................................................................................................................8  
Application 2560 VAV Cooling Only............................................................................9  
Overview....................................................................................................................9  
Application 2561 VAV Cooling or Heating..................................................................10  
Overview....................................................................................................................10  
Application 2562 VAV with Electric Reheat or Baseboard Radiation......................11  
Overview....................................................................................................................11  
Baseboard Radiation .................................................................................................11  
Electric Heat Interlock................................................................................................11  
Application 2563 VAV with Hot Water Reheat ...........................................................13  
Overview....................................................................................................................13  
Application 2564 VAV Series Fan Powered with Electric Reheat............................15  
Overview....................................................................................................................15  
Fan Operation............................................................................................................15  
Application 2565 VAV Series Fan Powered with Hot Water Reheat........................16  
Overview....................................................................................................................16  
Fan Operation............................................................................................................16  
Application 2566 VAV Parallel Fan Powered with Electric Reheat..........................17  
Overview....................................................................................................................17  
Fan Operation............................................................................................................17  
Application 2567 VAV Parallel Fan Powered with Hot Water Reheat......................18  
Overview....................................................................................................................18  
Fan Operation............................................................................................................18  
Application 2597 Slave Mode.......................................................................................19  
Overview....................................................................................................................19  
Using Auxiliary Points................................................................................................19  
Using the Controller as a Point Extension Device.....................................................19  
II  
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Siemens BACnet VAV Actuator Owner’s Manual  
Point Database ..............................................................................................................20  
Overview....................................................................................................................20  
Troubleshooting............................................................................................................29  
Basic Service Information..........................................................................................29  
Preventive Maintenance ............................................................................................29  
Safety Features..........................................................................................................30  
Controller LEDs..........................................................................................................30  
Automated Checkout....................................................................................................30  
Glossary.........................................................................................................................33  
Overview....................................................................................................................33  
Index...............................................................................................................................37  
Siemens Building Technologies, Inc.  
III  
How To Use This Manual  
This manual is written for the owner and user of Siemens Building Technologies BACnet VAV  
Actuator. It is designed to help you become familiar with the Siemens BACnet VAV Actuator  
and its applications.  
This section covers manual organization, manual conventions, symbols used in the manual,  
and other information that will help you use this manual.  
Manual Organzation  
This manual contains the following chapters:  
Chapter 1, Hardware, describes the hardware components and the accessories that  
are used with the BACnet VAV Actuator.  
Chapter 2, Applications for BACnet VAV Actuator, describes the control applications  
available in the model of the BACnet VAV Actuator that includes a terminal block for  
wireable input/output connections.  
Chapter 3, Point Database, defines the point database descriptors and includes  
address and applications.  
Chapter 4, Troubleshooting, describes basic corrective measures you can take  
should you encounter a problem when using the BACnet VAV Actuator. For issues  
not covered in this chapter, consult your local Siemens Building Technologies, Inc.,  
representative.  
The Glossary describes the terms and acronyms used in this manual.  
The Index helps you locate information presented in this manual.  
Siemens Building Technologies, Inc.  
V
How To Use This Manual  
Manual Conventions  
The following table lists conventions to help you use this manual in a quick and efficient  
manner.  
Convention  
Example  
Actions that you  
should perform are  
specified in boldface  
font.  
Type F for Field panels.  
Click OK to save changes and close the dialog box.  
Error and system  
messages are  
displayed in Courier  
New font.  
The message Report Definition successfully renamed  
appears in the status bar.  
New terms appearing  
for the first time are  
italicized.  
The Open Processor continuously executes a user-defined set of  
instructions called the control program.  
Manual Symbols  
The following table lists the symbols used in this owner’s manual to draw your attention to  
important information.  
Notation  
Symbol  
Meaning  
Indicates that personal injury or loss of life may occur to the  
user if a procedure is not performed as specified.  
WARNING:  
Indicates that equipment damage or loss of data may occur if  
the user does not follow a procedure as specified.  
CAUTION:  
Getting Help  
For more information about the BACnet VAV Actuator, contact your local Siemens Building  
Technologies, Inc. representative.  
Where To Send Comments  
Your feedback is important to us. If you have comments about this manual, please submit  
them to [email protected].  
VI  
Siemens Building Technologies, Inc.  
1
Product Overview  
Introduction  
The BACnet VAV Actuator is the Siemens Building Technologies, Inc. FLN controller  
used in pressure independent Variable Air Volume applications (Figure 1). It provides  
Direct Digital Control (DDC) for eight applications, and can operate independently as  
a stand-alone DDC room controller or networked with a field panel. The controller  
provides all input/output, system, and local communication connections. Hardware  
consists of the controller and the mounting bracket.  
Table 1 lists the BACnet VAV Actuator products that are covered:  
Table 1. BACnet VAV Actuator – Electronic Output Applications.  
Application  
Number  
Application Description  
2560  
2561  
2562  
2563  
2564  
2565  
2566  
2567  
2597  
VAV Cooling Only  
VAV Cooling or Heating  
VAV with Electronic Reheat or Baseboard Radiation  
VAV with Hot Water Reheat  
VAV Series Fan Powered with Electric Reheat  
VAV Series Fan Powered with Hot Water Reheat  
VAV Parallel Fan Powered with Electric Reheat  
VAV Parallel Fan Powered with Hot Water Reheat  
Slave Mode  
Ordering Notes  
BACnet VAV Actuator (GDE Actuator)  
BACnet VAV Actuator (GLB Actuator)  
550-430  
550-431  
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1
Product Overview  
Air Velocity  
Sensor  
BACnet  
Connection  
Status/DO LEDs  
Power  
Connection  
Airflow  
Pickup Tubes  
Figure 1. Siemens BACnet VAV Actuator.  
Hardware Inputs  
Analog  
Air Velocity Sensor (AVS)  
Duct temperature sensor (optional)  
Application 2561  
Room temperature sensor (RTS)  
Room temperature setpoint dial (optional)  
Digital  
Night mode override (optional)  
Wall switch (optional)  
Hardware Outputs  
Analog  
None  
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Digital  
Application  
2560, 2561, 2562, 2563  
Autozero Module (AZM) (optional)  
All  
Damper Actuator  
Fan  
2565, 2566, 2567  
2563  
2563  
First valve actuator (required)  
Second valve actuator (optional) or AZM (optional)  
Stage 1 electric reheat; or, 2-position heating valve  
Stage 1 electric reheat  
2562  
2564, 2566  
2562, 2564, 2566  
2562, 2564, 2566  
2565, 2567  
Stage 2 electric reheat (optional)  
Stage 3 electric reheat (optional)  
Valve actuator  
Power Wiring  
The controller is powered by 24 Vac. Power wiring connects to the two screw  
terminals on the controller labeled “C” (Common) and “H” (Hot) on the terminal block  
labeled “24 VAC”. No earth ground connection is required (Figure 2).  
24V  
24VAC Line  
24VAC Neutral  
Dependent On  
Local Codes  
Required If Primary  
Is Over 150 VAC  
Earth  
Neutral Bond Wire  
Figure 2. Power Wiring.  
Siemens Building Technologies, Inc.  
3
Product Overview  
Communication Wiring  
The controller connects to the field panel by means of a Floor Level Network (FLN)  
trunk. Communication wiring connects to the three screw terminals on the controller  
labeled “+” (positive), “-“(negative), and “S” (Shield) (Figure 3).  
FLN TRUNK  
3-Wire Network Interface  
+ -  
+ -  
+ -  
+ -  
e to earth  
Terminator  
Note: = System Common  
(SHIELD)  
(SHIELD)  
120 ohm  
½ W  
(-)  
(+)  
(-)  
(+)  
120 ohm  
½ W  
Wirenut  
NOTE: When wiring a 3-wire system to a 2-wire system see  
the Wiring Guidelines Manual (125-3002) for detailed information.  
Figure 3. Communication Wiring (2-wire).  
Figure 4. Communication Wiring (3-wire).  
Controller LED Indicators  
The controller has seven Light Emitting Diode (LED) indicators (see Figure 1).  
Table 2. Controller LEDs.  
LED Type  
Label  
LED  
Indication  
(if present)*  
Number  
DO  
LED 3 - LED 6  
3 - 6  
Indicates the ON/OFF status of the DO  
associated with it. A glowing LED indicates that  
the DO is energized.  
Transmit  
Receive  
TX  
RX  
0
1
2
Indicates, when flashing, that the controller is  
transmitting information to the field panel.  
Indicates, when flashing, that the controller is  
receiving information from the field panel.  
BST  
BST  
Indicates, when flashing ON and OFF once per  
second, that the controller is functioning  
properly.  
”Basic Sanity Test”  
* Some LED labels and numerals may be hidden by the controller cover.  
Temperature Sensors  
Room Temperature Sensor  
The controller room temperature sensor connects to the controller by means of a  
cable terminated at both ends with a six-conductor RJ-11 plug-in connector.  
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Duct Temperature Sensor  
An optional duct temperature sensor provides duct air temperature sensing inputs to  
the controller.  
For more information about temperature sensors, contact your local Siemens  
Building Technologies, Inc. representative.  
Related Equipment  
Autozero Module (optional) 540-200  
Relay Module  
Damper Actuator(s)  
Duct Temperature Sensor (10K Ω) (optional)  
Room Temperature Sensor  
Contact your local Siemens Building Technologies, Inc. representative for product  
numbers and more information.  
Siemens Building Technologies, Inc.  
5
2
Applications  
Basic Operation  
The BACnet VAV Actuator provides Direct Digital Control (DDC) for Variable Air Volume  
(VAV) terminal box applications. Temperature control varies with the application. If present,  
heating can be provided by hot water, up to three stages of electric reheat, or optional  
baseboard radiation.  
Sequencing Logic (optional)  
This application has the additional capability to sequence the flow and mechanical heating  
when heated supply air is available.  
Control Temperature Setpoints  
The controller maintains a specified temperature setpoint based on Day/Night mode, or the  
heating/cooling mode, or the setpoint dial (if used).  
Day/Night Mode  
The controller maintains the specified day setpoint temperature during daytime hours and the  
specified night setpoint at night.  
Night Mode Override Switch  
If the ROOM TEMPERATURE SENSOR has an override switch, it can be used to command  
the controller into day mode for an adjustable period of time. This only affects a controller in  
night mode.  
Control Loops  
Temperature Loop Heating Loop Cooling Loop – maintain temperature setpoint by  
changing the flow setpoint or modulating the heat source (valve/electric heat).  
Flow Loop – maintains flow setpoint by modulating the damper actuator.  
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Siemens BACnet VAV Actuator Owner’s Manual  
Calibration  
Air Velocity Sensor - Calibration of the controller's internal air velocity sensor is periodically  
required to maintain accurate air velocity readings. Calibration may be set to take place  
automatically or manually.  
Autozero Module (AZM) – Used when damper cannot be closed and constant airflow is  
needed.  
For a controller used with an AZM, calibration occurs without closing the damper.  
Application 2560, 2561, 2562, 2563.  
For a controller used without an AZM, the damper is briefly commanded closed to get  
a zero airflow reading and an accurate damper position during calibration.  
Application 2560, 2561, 2562, 2563.  
Hot Water Valve – Calibration of a hot water valve (if used) is done by briefly commanding  
the valve closed. Application 2562, 2565, 2567.  
Damper Status Operation  
When using an AZM it is possible, after a period of operation, for the calculated damper  
position to differ from the actual (physical) damper position.  
If this occurs, the controller will automatically compensate for any difference by readjusting  
the calculated damper position. This calculated position may not match the actual position.  
Fail-safe Operation  
If the air velocity sensor fails, the controller uses pressure dependent control. The  
temperature loop controls the operation of the damper.  
If the room temperature sensor fails, then the controller operates using the last known  
temperature value.  
Heating and Cooling Switchover  
The heating/cooling switchover determines whether the controller is in heating or cooling  
mode by monitoring the room temperature and the demand for heating and cooling (as  
determined by the temperature control loops).  
Modulate Damper During Heating Mode (optional)  
Applications that have a heating source (valve/electric) can be configured to modulate the  
flow setpoint in sequence with the heating source.  
CAUTION:  
If the damper is set to modulate in heating mode, make sure the controller is in the  
appropriate mode for the current supply air temperature.  
Siemens Building Technologies, Inc.  
7
Applications  
Hot Water Reheat  
CAUTION:  
Do not set HTG FLOW MIN to 0 cfm (0 lps). A minimum airflow should be provided  
across the heating coils when the heating valve is open.  
When the controller is in cooling mode, the heating valve(s) are closed.  
The heating loop modulates the heating valve(s) to warm up the room. In cooling mode, the  
heating valve is closed.  
Electric Reheat  
CAUTION:  
Verify that the equipment is supplied with safeties by others to ensure that there is  
airflow across the heating coils when they are to be energized.  
The heating loop controls up to three stages of electric reheat to warm up the room. The  
electric reheat is time modulated using a duty cycle. When the controller is in cooling mode,  
the electric heat is OFF at all times.  
Notes  
1. If the temperature swings in the room are excessive or if there is trouble in maintaining  
the setpoint, contact your local Siemens Building Technologies, Inc. representative for  
more information.  
2. The BACnet VAV Actuator, as shipped from the factory, keeps all associated equipment  
OFF. The controller and its equipment are released to application control at start-up.  
3. “Safeties by Others”: This note implies that the associated equipment has safety features  
installed, for example adding mechanical stops to the dampers.  
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Application 2560 VAV Cooling Only  
Overview  
In Application 2560, the controller modulates the supply air damper of the terminal box for  
cooling. In order for it to work properly, the central air-handling unit must provide cool supply  
air. See Figure 5.  
Supply Air  
Damper  
3 to 5 Straight Duct Diameters  
required for proper sensor reading  
Supply Air  
SAFETIES  
BY  
OTHERS  
Air  
Velocity  
Sensor  
Modulating  
Damper  
Actuator  
Spare DO or  
Autozero Module (Opt.)  
Spare DOs  
"COMMON" Termination for all DOs  
RTS  
Wall Switch (Opt.)  
Spare AI (10K ohm thermistor)  
or Spare DI  
NO  
FLN  
Hi/Lo Tubing  
Connections  
BACnet Actuator  
Controller  
Figure 5. Application 2560 Control Drawing.  
Siemens Building Technologies, Inc.  
9
Applications  
Application 2561 VAV Cooling or Heating  
Overview  
In Application 2561, the controller modulates the supply air damper of the terminal box for  
cooling and heating. In order for it to work properly, the central air-handling unit must provide  
cool supply air in cooling mode and warm air in heating mode. See Figure 6.  
Supply Air  
Damper  
3 to 5 Straight Duct Diameters  
required for proper sensor reading  
Supply Air  
SAFETIES  
BY  
OTHERS  
Air  
Velocity  
Sensor  
Modulating  
Damper  
Actuator  
Spare DO or  
Autozero Module (Opt.)  
Spare DOs  
"COMMON" Termination for all DOs  
RTS  
Wall Switch (Opt.)  
N O  
Duct Temp Sensor  
(10K ohm thermistor - Opt.)  
FLN  
Hi/Lo Tubing  
Connections  
BACnet Actuator  
Controller  
Figure 6. Application 2561 Control Drawing.  
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Siemens BACnet VAV Actuator Owner’s Manual  
Application 2562 VAV with Electric Reheat or  
Baseboard Radiation  
Overview  
In Application 2562, the controller modulates the supply air damper for the terminal box for  
cooling and controls stages of electric reheat or baseboard radiation for heating. When in  
heating, the terminal box either maintains minimum airflow or modulates the supply air  
damper. In order for the terminal box to work properly, the central air-handling unit must  
provide supply air. See Figure 7 and Figure 8.  
Baseboard Radiation  
Baseboard radiation can be a two-position valve or electrical resistance heating.  
If the controller is in cooling mode, the heating valve is closed. When in heating mode, the  
controller will operate the heating valve to maintain the heating setpoint.  
Electric Heat Interlock  
The electric heat stages will be disabled (turned off) when the electric heat airflow is less than  
the defined minimum.  
CAUTION:  
Do not set EHEAT FLOW (the defined minimum) to less than 5%; otherwise, the  
electric heat interlock will be disabled.  
Siemens Building Technologies, Inc.  
11  
Applications  
Supply Air  
Damper  
3 to 5 Straight Duct Diameters  
required for proper sensor reading  
Supply Air  
SAFETIES  
BY  
OTHERS  
Air  
Velocity  
Sensor  
Modulating  
Damper  
Actuator  
Elec Heat  
Stage 3  
Electric Heat  
Stage 2  
Electric Heat  
Stage 1  
Spare DO or  
Autozero Module (Opt.)  
"COMMON" Termination for all DOs  
RTS  
Wall Switch (Opt.)  
NO  
10K ohm Thermistor  
or Spare DI  
FLN  
Hi/Lo Tubing  
Connections  
BACnet Actuator  
Controller  
Figure 7. Application 2562 Control Drawing (Electric Heat).  
Supply Air  
Damper  
3 to 5 Straight Duct Diameters  
required for proper sensor reading  
Supply Air  
SAFETIES  
BY  
OTHERS  
Air  
Velocity  
Sensor  
Modulating  
Damper  
Actuator  
Spare DO or  
Autozero Module (Opt.)  
2-Position  
Valve  
Spare DOs  
"COMMON" Termination for all DOs  
RTS  
Wall Switch (Opt.)  
NO  
10K ohm Thermistor  
or Spare DI  
FLN  
Hi/Lo Tubing  
Connections  
BACnet Actuator  
Controller  
Figure 8. Application 2562 Control Diagram (Baseboard Radiation).  
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Siemens BACnet VAV Actuator Owner’s Manual  
Application 2563 VAV with Hot Water Reheat  
Overview  
In Application 2563, the controller modulates the supply air damper of the terminal box for  
cooling and modulates a reheat valve (or valves) for heating. When in heating, the terminal  
box either maintains minimum airflow or modulates the supply air damper. In order for the  
terminal box to work properly, the central air handling unit must provide supply air. See  
Figure 9 and Figure 10.  
Supply Air  
Damper  
3 to 5 Straight Duct Diameters  
required for proper sensor reading  
Supply Air  
SAFETIES  
BY  
OTHERS  
Air  
Velocity  
Sensor  
Modulating  
Damper  
Actuator  
Spare DO or  
Autozero Module (Opt.)  
Valve  
Actuator  
Spare DO  
"COMMON" Termination for all DOs  
RTS  
Wall Switch (Opt.)  
NO  
10K ohm Thermistor  
or Spare DI  
FLN  
Hi/Lo Tubing  
Connections  
BACnet Actuator  
Controller  
Figure 9. Application 2563 Control Drawing (HW Heat and Spare DO).  
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13  
Applications  
Supply Air  
Damper  
3 to 5 Straight Duct Diameters  
required for proper sensor reading  
Supply Air  
SAFETIES  
BY  
OTHERS  
Air  
Velocity  
Sensor  
Modulating  
Damper  
Actuator  
Valve  
Actuator  
Valve  
Actuator  
"COMMON" Termination for all DOs  
RTS  
Wall Switch (Opt.)  
NO  
10K ohm Thermistor  
or Spare DI  
FLN  
Hi/Lo Tubing  
Connections  
BACnet Actuator  
Controller  
Figure 10. Application 2563 Control Drawing (Two Valve Actuators).  
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Application 2564 VAV Series Fan Powered with  
Electric Reheat  
Overview  
In Application 2564, the controller modulates the supply air damper of the terminal box for  
cooling and controls stages of electric reheat for heating. When in heating, the terminal box  
either maintains minimum airflow or modulates the supply air damper. The terminal box also  
has a series fan for air circulation. In order for the terminal box to work properly, the central  
air-handling unit must provide supply air. See Figure 11.  
Fan Operation  
CAUTION:  
On series fan powered terminal boxes, the terminal box fan must be  
controlled/interlocked to start either before or at the same time as the central air  
handler. Failure to do so may cause the terminal box fan to rotate backwards and  
cause consequent damage at start up.  
In day mode, the fan is ON all the time. In night mode, the fan cycles on when heating or  
cooling is required.  
Recirculated  
Air Damper  
Recirculated  
Plenum Air  
Air  
Velocity  
Sensor  
3 Stage  
Electric  
Reheat  
Fan  
Supply Air  
Supply  
Air Damper  
SAFETIES  
BY  
OTHERS  
3 to 5 Straight Duct Diameters  
required for proper sensor reading  
Modulating  
Damper  
Actuator  
Elec Heat  
Stage 3  
Electric Heat  
Stage 2  
Electric Heat  
Stage 1  
"COMMON" Termination for all DOs  
RTS  
Wall Switch (Opt.)  
NO  
10K ohm Thermistor  
or Spare DI  
FLN  
Hi/Lo Tubing  
Connections  
BACnet Actuator  
Controller  
Figure 11. Application 2564 Control Drawing.  
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15  
Applications  
Application 2565 VAV Series Fan Powered with Hot  
Water Reheat  
Overview  
In Application 2565, the controller modulates the supply air damper of the terminal box for  
cooling and modulates a hot water valve for heating. When in heating, the terminal box either  
maintains minimum airflow or modulates the supply air damper. The terminal box also has a  
series fan for air circulation. In order for the terminal box to work properly, the central air  
handling unit must provide supply air. See Figure 12.  
Fan Operation  
CAUTION:  
On series fan powered terminal boxes, the terminal box fan must be  
controlled/interlocked to start either before or at the same time as the central air  
handler. Failure to do so may cause the terminal box fan to rotate backwards and  
cause consequent damage at start up.  
In day mode, the fan is ON all the time. In night mode, the fan cycles on when heating or  
cooling is required.  
Recirculated  
Air Damper  
Recirculated  
Plenum Air  
Air  
Velocity  
Sensor  
Fan  
Supply Air  
Supply  
Air Damper  
SAFETIES  
BY  
OTHERS  
3 to 5 Straight Duct Diameters  
required for proper sensor reading  
Modulating  
Damper  
Actuator  
Valve  
Actuator  
Spare DO  
"COMMON" Termination for all DOs  
RTS  
Wall Switch (Opt.)  
NO  
10K ohm Thermistor  
or Spare DI  
FLN  
Hi/Lo Tubing  
Connections  
BACnet Actuator  
Controller  
Figure 12. Application 2565 Control Drawing.  
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Application 2566 VAV Parallel Fan Powered with  
Electric Reheat  
Overview  
In Application 2566, the controller modulates the supply air damper of the terminal box for  
cooling and controls stages of electric reheat for heating. When in heating, the terminal box  
either maintains minimum airflow or modulates the supply air damper. The terminal box also  
has a parallel fan, which re-circulates the room air. In order for the terminal box to work  
properly, the central air handling unit must provide supply air. See Figure 13.  
Fan Operation  
The fan turns on when heating is required.  
Recirculated  
Air Damper  
Recirculated  
Plenum Air  
Fan  
Air  
Velocity  
Sensor  
Supply Air  
Supply  
Air Damper  
SAFETIES  
BY  
OTHERS  
3 to 5 Straight Duct Diameters  
required for proper sensor reading  
Modulating  
Damper  
Actuator  
Elec Heat  
Stage 1  
Electric Heat  
Stage 2  
Electric Heat  
Stage 3  
"COMMON" Termination for all DOs  
RTS  
Wall Switch (Opt.)  
NO  
10K ohm Thermistor  
or Spare DI  
FLN  
Hi/Lo Tubing  
Connections  
BACnet Actuator  
Controller  
Figure 13. Application 2566 Control Drawing.  
Siemens Building Technologies, Inc.  
17  
Applications  
Application 2567 VAV Parallel Fan Powered with Hot  
Water Reheat  
Overview  
In Application 2567, the controller modulates the supply air damper of the terminal box to  
provide for cooling and modulates a hot water valve for heating. When in heating, the  
terminal box either maintains minimum airflow or modulates the supply air damper. The  
terminal box also has a parallel fan that re-circulates the room air. In order for the terminal  
box to work properly, the central air handling unit must provide supply air. See Figure 14.  
Fan Operation  
The fan turns on when heating is required.  
Recirculated  
Air Damper  
Recirculated  
Fan  
Plenum Air  
Air  
Velocity  
Sensor  
Supply Air  
Supply  
Air Damper  
SAFETIES  
3 to 5 Straight Duct Diameters  
required for proper sensor reading  
BY  
OTHERS  
Modulating  
Damper  
Actuator  
Valve  
Actuator  
Spare DO  
"COMMON" Termination for all DOs  
RTS  
Wall Switch (Opt.)  
NO  
10K ohm Thermistor  
or Spare DI  
FLN  
Hi/Lo Tubing  
Connections  
BACnet Actuator  
Controller  
Figure 14. Application 2567 Control Drawing.  
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Siemens BACnet VAV Actuator Owner’s Manual  
Application 2597 Slave Mode  
Overview  
Application 2597 is the slave mode application for the BACnet VAV Actuator (P/N 550-430  
and 550-431). Slave mode is the default application that comes up when power is first  
applied to the controller. Slave mode provides no control. Its purpose is to allow the operator  
to perform equipment checkout before a control application is put into effect and to set some  
basic controller parameters (CTLR ADDRESS, APPLICATION, etc.). A controller in default  
state can also be used as a point extension device by unbundling spare I/O points at the field  
panel.  
Using Auxiliary Points  
It is possible to have extra points available on a BACnet VAV Controller — Electronic Output  
in addition to the ones used by the current application that is running in the controller. If these  
extra points are to be controlled by a field panel, then they must be unbundled at the field  
panel.  
Using the Controller as a Point Extension Device  
If the controller is only used as a point extension device, with no control application in affect,  
its application must be set to slave mode and points must be unbundled at the field panel. All  
points must be controlled from the field panel in order to be used.  
DO 3, DO 4, DO 5, and DO 6 may be used as separate DOs or in pairs (DO 3 and DO 4, DO  
5 and DO 6) to control a motor as shown in the example.  
NOTE:  
If using either a motor or DOs as auxiliary points, be sure to set MTR SETUP to  
the correct value. If using a pair of DOs to control a motor, then the DOs cannot  
be unbundled. Only MTR1 COMD and MTR2 COMD can be unbundled to control  
the motors.  
Example  
If using DO 1 and DO 2 as the physical terminations for a motor, follow these steps:  
1. Set MTR SETUP to 1 to enable the motor.  
2. Unbundle MTR1 COMD at the field panel to command the motor from the field panel.  
Contact your local Siemens Building Technologies, Inc. representative for other combinations  
of DOs and motors.  
Siemens Building Technologies, Inc.  
19  
3
Point Database  
Overview  
Chapter 3 presents a description of the BACnet VAV Controller — Electronic Output point  
database, including point descriptors, point addresses, and a listing of applications in which  
each point is found.  
Descriptor  
CTLR ADDRESS  
APPLICATION  
Address1  
Application  
Description  
01  
02  
All  
All  
Identifies the controller on the FLN trunk.  
Identification number of the program running in the  
controller.  
RMTMP OFFSET  
03  
All  
Compensates for deviations between the value of  
ROOM TEMP and the actual room temperature.  
This corrected value is displayed in CTL TEMP.  
RMTMP OFFSET + ROOM TEMP = CTL TEMP  
ROOM TEMP  
HEAT.COOL  
{04}2  
{05}  
All  
Actual reading from the room temperature sensor.  
All except  
2560, 2597  
Current mode of operation for applications that can  
be in either a heating mode or a cooling mode.  
DAY CLG STPT  
06  
All except 2597  
The temperature setpoint in degrees that the  
controller maintains during day periods in cooling  
mode if a room temperature sensor setpoint dial is  
not present or is not used. See STPT DIAL.  
NGT CLG STPT  
DAY HTG STPT  
08  
07  
All except 2597  
The temperature setpoint in degrees that the  
controller maintains during the night periods in  
cooling mode.  
All except 2560,  
The temperature setpoint in degrees that the  
controller maintains during day periods in heating  
mode if a room temperature sensor setpoint dial is  
not present or is not used. See STPT DIAL.  
2597  
NGT HTG STPT  
RM STPT MIN  
09  
11  
All except 2560,  
The temperature setpoint in degrees that the  
controller maintains during the night periods in  
heating mode.  
2597  
All except 2597  
The minimum temperature setpoint in degrees that  
the controller can use from the setpoint dial. This  
overrides any temperature setpoint from the  
setpoint dial that falls below this minimum.  
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20  
Siemens BACnet VAV Actuator Owner’s Manual  
Descriptor  
Address1  
Application  
Description  
RM STPT MAX  
12  
All except 2597  
The maximum temperature setpoint in degrees that  
the controller can use from the setpoint dial. This  
overrides any temperature setpoint from the  
setpoint dial that falls above this maximum.  
RM STPT DIAL  
STPT DIAL  
{13}2  
All  
The temperature setpoint in degrees from the room  
temperature sensor (not available on all  
temperature sensor models). This setpoint will be  
used for control in day mode (heating or cooling)  
when enabled by STPT DIAL.  
14  
All except 2597  
YES indicates that there is a room setpoint dial on  
the room temperature sensor and it should be used  
as the temperature setpoint for control in  
day/occupied mode. NO indicates that the  
appropriate preset setpoint will be used as the  
temperature setpoint for control in day/occupied  
heating or cooling mode. Valid input: YES or NO.  
AUX TEMP  
{15}  
{15}  
All except 2561  
Actual reading from a 10K Ω thermistor connected  
to the controller's Al 3 input. When a thermistor is  
connected at Al 3, DI 3 is not available. See DI 3.  
SUPPLY TEMP  
2561  
Actual reading from a 10K Ω thermistor connected  
to the controller's Al 3 input. The controller uses this  
value to determine whether it is in heating or  
cooling mode.  
FLOW START  
FLOW END  
16  
17  
18  
All except  
Determines how the damper modulation will be  
2560, 2561, 2597 sequenced while in heating mode. When HTG  
LOOPOUT is above this value, then FLOW STPT  
starts to increase.  
All except  
Determines how the damper modulation will be  
2560, 2561, 2597 sequenced while in heating mode. When HTG  
LOOPOUT is below this value, then FLOW STPT  
starts to decrease.  
WALL SWITCH  
All  
YES indicates that the controller is to monitor the  
status of a wall switch that is connected to DI 2. NO  
indicates that the controller will not monitor the  
status of a wall switch, even if one is connected.  
Valid input: YES or NO.  
DI OVRD SW  
OVRD TIME  
{19}2  
All  
Actual indication of the status of the override switch  
(not physically available on all temperature sensor  
models) at the room temperature sensor. ON  
indicates that the switch is being pressed. OFF  
indicates that the switch is released.  
Valid input: ON or OFF.  
20  
All except  
2597  
The amount of time in hours that the controller will  
operate in day/occupied mode when the override  
switch is pressed while the controller is in  
night/unoccupied mode.  
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21  
Point Database  
Descriptor  
Address1  
Application  
Description  
NGT OVRD  
{21}2  
All except  
2597  
Indicates the mode that the controller is operating in  
with respect to the override switch. NIGHT indicates  
that the switch has not been pressed and the  
override timer is not active. DAY indicates that the  
switch has been pressed and the override timer is  
active. The controller then uses a day mode  
temperature setpoint. This point is only in effect  
when DAY.NGT indicates night mode.  
REHEAT START  
REHEAT END  
DI 2  
22  
23  
All except  
Determines how the reheat modulation will be  
2560, 2561, 2597 sequenced while in heating mode. When HTG  
LOOPOUT is above this value, then the reheat  
modulates upward.  
All except 2560,  
2561, 2597  
Determines how the reheat modulation will be  
sequenced while in heating mode. When HTG  
LOOPOUT is below this value, then the reheat  
modulates downward.  
{24}  
All  
Actual status of a contact connected to the  
controller at DI 2. ON indicates that the contact is  
closed; OFF indicates that the contact is open. If a  
wall switch is used, it is connected to DI 2. See  
WALL SWITCH.  
DI 3  
{25}2  
All except  
2561  
Actual status of a contact connected to the  
controller at Al 3/DI 3. ON indicates that the contact  
is closed; OFF indicates that the contact is open.  
When a contact is connected at DI 3, Al 3 is not  
available. See AUX TEMP.  
SERIES ON  
SERIES ON  
SERIES OFF  
26  
26  
27  
2564, 2565  
2566  
When flow rises above this value, the series fan will  
turn ON.  
This point is present, but not used in this  
application.  
2564, 2565  
When flow drops below this value and other  
conditions have been met, the series fan will turn  
OFF.  
SERIES OFF  
PARALLEL ON  
PARALLEL ON  
27  
28  
28  
2566  
2564  
This point is present, but not used in this  
application.  
This point is present, but not used in this  
application.  
2566, 2567  
When flow drops below this value and other  
conditions have been met, the parallel fan will turn  
ON.  
DAY.NGT  
{29}  
30  
All  
Indicates the mode in which the controller is  
operating. Day temperature setpoints will be used in  
day mode. Night temperature setpoints will be used  
in night mode. This point is normally set by the field  
panel.  
PARALLEL OFF  
2564  
This point is present, but not used in this  
application.  
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Siemens BACnet VAV Actuator Owner’s Manual  
Descriptor  
Address1  
Application  
Description  
PARALLEL OFF  
30  
2566,  
2567  
When flow rises above this value, the parallel fan  
will turn OFF.  
CLG FLOW MIN  
CLG FLOW MAX  
HTG FLOW MIN  
HTG FLOW MAX  
AIR VOLUME  
31  
32  
All except 2597  
The minimum amount of air in CFM (LPS) to be  
supplied to the space in cooling mode.  
All except 2597  
The maximum amount of air in CFM (LPS) to be  
supplied to the space in cooling mode.  
33  
All except 2560,  
The minimum amount of air in CFM (LPS) to be  
supplied to the space in heating mode.  
2597  
34  
All except 2560,  
The maximum amount of air in CFM (LPS) to be  
supplied to the space in heating mode.  
2597  
{35}2  
All  
Actual amount of air in CFM (LPS) currently  
passing through the air velocity sensor.  
FLOW COEFF  
MTR3 COMD  
36  
All  
Calibration factor for the airflow sensor.  
{37}  
2560, 2561, 2562, The value to which the Motor 3 actuator is  
2597  
commanded in percent of full value.  
VLV2 COMD  
MTR3 POS  
VLV2 POS  
MTR3 TIMING  
DO 1  
{37}  
{38}  
{38}  
39  
2563  
The value to which the valve 2 actuator is  
commanded in percent of full travel for applications  
using a second water valve.  
2560, 2561, 2562, The current position of the Motor 3 actuator in  
2597  
percent of full travel. This value is calculated based  
on motor run time.  
2563  
The current position of Valve 2 in percent of full  
travel. This value is calculated based on valve run  
time.  
All except  
The time required for the Motor 3 actuator to travel  
2564, 2565, 2566, from the full closed position to the full open position.  
2567  
{41}2  
{42}  
{43}  
{43}  
All  
All  
Digital output 1 controls a 24 Vac load with an ON  
or OFF status. If Motor 1 is enabled, DO 1 is  
coupled with DO 2 to control an actuator.  
DO 2  
Digital output 2 controls a 24 Vac load with an ON  
or OFF status. If Motor 1 is enabled, DO 2 is  
coupled with DO 1 to control an actuator.  
DO 3  
All except  
Digital output 3 controls a 24 Vac load with an ON  
2562, 2564, 2566 or OFF status. If Motor 2 is enabled, DO 3 is  
coupled with DO 4 to control an actuator.  
HEAT STAGE 1  
2562, 2564, 2566 This point is DO 3 in applications with electric  
reheat. This digital output controls the contact for  
the first stage of heating and has a status of ON or  
OFF.  
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Point Database  
Descriptor  
Address1  
Application  
Description  
DO 4  
{44}  
All except  
Digital output 4 controls a 24 Vac load with an ON  
2562, 2564, 2566 or OFF status. If Motor 2 is enabled, DO 4 is  
coupled with DO 3 to control an actuator.  
HEAT STAGE 2  
DO 5  
{44}  
{45}  
2562, 2564, 2566 This point is DO 4 in applications with electric  
reheat. This digital output controls the contact for  
the second stage of heating and has a status of ON  
or OFF.  
2560, 2561, 2563, Digital output 5 controls a 24 Vac load with an ON  
2597  
or OFF status. If Motor 3 is enabled, DO 5 is  
coupled with DO 6 to control an actuator.  
DO 5  
{45}  
2565, 2567  
Digital output 5 controls a 24 Vac load with an ON  
or OFF status.  
HEAT STAGE 3  
{45}2  
2562, 2564, 2566 This point is a digital output used to control the  
contact for the third stage of heating and has a  
status of ON or OFF.  
DO 6  
{46}  
All except  
Digital output 6 controls a 24 Vac load with an ON  
2564, 2565, 2566, or OFF status. If Motor 3 is enabled, DO 6 is  
2567  
coupled with DO 5 to control an actuator.  
In applications with CAL MODULE set to YES, this  
digital output controls the Autozero Module to  
calibrate the controller's internal air velocity  
transducer.  
FAN  
{46}  
2564, 2565, 2566, This point is a digital output used to control the fan.  
2567  
ON indicates that the DO is energized; OFF  
indicates that the DO is de-energized.  
DMPR COMD  
MTR1 COMD  
DMPR POS  
{48}  
{48}  
{49}  
All except 2597  
2597  
The value to which the damper motor is  
commanded in percent of full travel.  
The value to which the Motor 1 actuator is  
commanded in percent of full travel.  
All except 2597  
The current position of the damper motor in percent  
of full travel. This value is calculated based on  
motor run time.  
MTR1 POS  
{49}  
2597  
All  
The current position of Motor 1 in percent of full  
travel. This value is calculated based on motor run  
time. See MTR1 TIMING.  
MTR1 TIMING  
MTR2 COMD  
51  
The time required for the Motor 1 actuator to travel  
from full closed to the full open position.  
{52}2  
2560, 2561, 2597 The value to which the Motor 2 actuator is  
commanded in percent of full travel (for use as an  
auxiliary slave point).  
VLV COMD  
{52}  
{52}  
2565, 2567  
The value to which the valve actuator is  
commanded in percent of full travel for applications  
using a water valve.  
VLV1 COMD  
2563  
The value to which the valve 1 actuator is  
commanded in percent of full travel for applications  
using a water valve.  
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Siemens BACnet VAV Actuator Owner’s Manual  
Descriptor  
Address1  
Application  
Description  
MTR2 POS  
{53}  
2560, 2561, 2597 The current position of the Motor 2 actuator in  
percent of full travel (for use as an auxiliary slave  
point). This value is calculated based on motor run  
time. See MTR2 TIMING.  
VLV POS  
{53}  
{53}  
55  
2565  
The current position of the valve in percent of full  
travel for applications using a water valve. This  
value is calculated based on motor run time.  
VLV1 POS  
MTR2 TIMING  
2563  
The current position of valve 1 in percent of full  
travel for applications using a water valve. This  
value is calculated based on motor run time.  
All except  
The time required for the Motor 2 actuator to travel  
2562, 2564, 2566 from full closed to the full open position.  
DMPR ROT ANG  
DPR1 ROT ANG  
56  
56  
All except 2597  
The number of degrees the damper is free to travel.  
2597  
The number of degrees that damper 1 is free to  
travel.  
DPR2 ROT ANG  
MTR SETUP  
57  
58  
2597  
All  
The number of degrees that damper 2, the hot duct  
damper, is free to travel.  
The configuration setup code for Motors 1, 2, and 3.  
This enables the motors individually and sets each  
motor to be either direct or reverse acting.  
Note: When a motor is enabled, its associated DOs  
are enabled.  
DO DIR.REV  
59  
All  
The configuration setup code for DOs. Allows the  
DOs to be direct or reverse acting (enabled equals  
energized or disabled equals de-energized).  
EHEAT FLOW  
COOL TEMP  
60  
61  
2562  
2561  
The flow required before the electric heat will be  
enabled.  
The discharge air temperature where the controller  
will switch from heating to cooling mode. Used only  
in applications with SUPPLY TEMP.  
HEAT TEMP  
62  
2561  
The discharge air temperature where the controller  
will switch from cooling to heating mode. Used only  
in applications with SUPPLY TEMP.  
CLG P GAIN  
CLG l GAIN  
CLG D GAIN  
CHK OUT  
63  
64  
65  
66  
All except 2597  
All except 2597  
All except 2597  
All  
The proportional gain value for the cooling  
temperature control loop.  
The integral gain value for the cooling temperature  
control loop.  
The derivative gain value for the cooling  
temperature control loop.  
The procedure tests all of the necessary I/O and  
ensures the controller has the ability to operate  
within the set airflow range, between CLG FLOW  
MIN and CLG FLOW MAX.  
HTG P GAIN  
67  
All except  
2560, 2597  
The proportional gain value for the heating  
temperature control loop.  
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Point Database  
Descriptor  
Address1  
Application  
Description  
HTG l GAIN  
68  
All except 2560,  
The integral gain value for the heating temperature  
control loop.  
2597  
HTG D GAIN  
69  
All except 2560,  
The derivative gain value for the heating  
temperature control loop.  
2597  
CHK STATUS  
FLOW P GAIN  
70  
71  
All  
Displays the results of CHK OUT.  
All except 2597  
The proportional gain value for the flow control  
loop.  
FLOW l GAIN  
FLOW D GAIN  
FLOW BIAS  
FLOW  
72  
73  
All except 2597  
All except 2597  
All except 2597  
All except 2597  
The integral gain value for the flow control loop.  
The derivative gain value for the flow control loop.  
The biasing of the flow control loop.  
74  
{75}2  
Indicates the actual amount of air currently passing  
the air velocity sensor. The value is calculated as a  
percentage based on where the value of AIR  
VOLUME is in the range between 0 and CTL FLOW  
MAX.  
CTL FLOW MIN  
CTL FLOW MAX  
CTL TEMP  
{76}2  
{77}  
{78}  
All except 2597  
The active minimum flow used as a limit for the flow  
control loop. This value is the same as CLG FLOW  
MIN if the controller is in cooling mode, or is the  
same as HTG FLOW MIN if the controller is in  
heating mode, unless it is overridden.  
All except 2597  
The active maximum flow used as a limit for the flow  
control loop. This value is the same as CLG FLOW  
MAX if the controller is in cooling mode, or is the  
same as HTG FLOW MAX if the controller is in  
heating mode unless, it is overridden.  
All except 2597  
The temperature used as input for the temperature  
control loops. This value is the same as the value in  
ROOM TEMP and RM TEMP OFFSET unless it is  
overridden.  
CLG LOOPOUT  
HTG LOOPOUT  
AVG HEAT OUT  
{79}  
{80}  
All except 2597  
The cooling temperature control loop output value in  
percent.  
All except 2560,  
The heating temperature control loop output value  
in percent.  
2597  
{81}2  
2562, 2564, 2566 This point is used to determine what stages of  
electric heat are used for a given loop output value.  
The ranges for the value are determined by the  
number of stages used: 0 to 100 for 1 stage of  
electric heat, 0 to 200 for 2 stages of electric heat,  
and 0 to 300 for 3 stages of electric heat.  
With electric heat, this value is equal to: HTG  
LOOPOUT × STAGE COUNT.  
STAGE MAX  
STAGE FAN  
82  
83  
2562, 2564, 2566 The value, in percent, which the heating loop must  
exceed for the electric heat to be ON for the full duty  
cycle (STAGE TIME).  
2565, 2567  
The valve must be opened greater than this value  
before the fan will turn ON.  
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Descriptor  
Address1  
Application  
Description  
STAGE MIN  
83  
2562, 2564, 2566 The value, in percent, which the heating loop must  
go below for the electric heat to be OFF for the full  
duty cycle (STAGE TIME).  
DMPR STATUS  
{84}2  
2560, 2561, 2562, This point is used only when CAL MODULE set to  
2563  
YES. It readjusts the damper position if the  
command value is not equal to the actual position of  
the damper. CAL indicates that the damper is  
operating normally. RECAL indicates that the  
damper position was adjusted (recalibrated) by 25%  
because the desired airflow was not obtainable  
under its current status.  
SWITCH LIMIT  
85  
All except  
The active temperature control loop output must be  
2560, 2561, 2597 less than this value to switch between cooling mode  
and heating mode. Actual switchover depends on  
SWITCH DBAND being exceeded and is subject to  
SWITCH TIME being expired.  
SWITCH TIME  
CAL MODULE  
86  
87  
All except  
The time, in minutes, before the heat/cool mode can  
2560, 2561, 2597 change over when the other parameters are  
appropriate.  
All except 2564,  
YES indicates that the Autozero Modules are  
2565, 2566, 2567 enabled to calibrate the air velocity transducers.  
The dampers will not be used for calibration. NO  
indicates that Autozero Modules are disabled and  
that the air velocity transducers will be calibrated by  
closing the dampers. Valid input: YES or NO.  
STAGE COUNT  
88  
2562, 2564, 2566 The number of electric heating stages used by the  
application. DOs associated with unused stages  
may be used as spare DOs.  
VALVE COUNT  
STAGE TIME  
88  
89  
2563  
The number of heating valves available.  
2562, 2564, 2566 The cycle time in minutes for the electric reheat  
stages. For example, if there are three stages of  
electric heat and STAGE TIME = 10 minutes,  
STAGE COUNT = 3, and AVG HEAT OUT = 150%  
then, Stage 1 is ON for 10 minutes (100% of the  
time), Stage 2 is ON for 5 minutes (50% of 10  
minutes) and OFF for 5 minutes, and Stage 3 is  
OFF.  
SWITCH DBAND  
90  
All except  
The temperature range in degrees which is  
2560, 2561, 2597 compared to the difference between CTL TEMP and  
CTL STPT. The difference must exceed this value  
for temperature control mode to change over.  
Changeover is also subject to the active temperature  
control loop output being below SWITCH LIMIT  
(Point 85) and SWITCH TIME being expired.  
CTL STPT  
{92}  
{93}  
All except  
The actual setpoint value being used as input for the  
active temperature control loop.  
2597  
FLOW STPT  
All except  
The setpoint of the flow control loop.  
2597  
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Point Database  
Descriptor  
Address1  
Application  
Description  
CAL AIR  
{94}  
All  
YES commands the controller to go through  
calibration sequence for the air velocity transducers.  
YES is also displayed when the calibration sequence  
is started automatically. CAL AIR automatically  
returns to NO after the calibration sequence is  
completed. Valid input: YES or NO.  
CAL SETUP  
CAL TIMER  
95  
96  
All  
All  
The configuration setup code for the calibration  
sequence options.  
Time interval, in hours, between the calibration  
sequence initiations if a timed calibration option is  
selected in CAL SETUP.  
DUCT AREA  
97  
All  
Area, in square feet (square meters), of the duct  
where the air velocity sensor is located. This is a  
calculated value (calculated by the field panel or  
computer being used) that depends on duct shape  
and size. It is used in calculating all points in units of  
CFM, CF, LPS and L.  
Valid input: .025 ft2 (.002 m2) through 6.375 ft2 (.5923  
m2).  
LOOP TIME  
98  
All except  
2597  
The time, in seconds, between control loop  
calculations.  
ERROR STATUS  
{99}2  
All  
The status code indicating any errors detected  
during controller power up. A status of 0 indicates  
there are no problems.  
1. Points not listed are not used in this application.  
2. Point numbers that appear in brackets { } may be unbundled at the field panel.  
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4
Troubleshooting  
This chapter describes corrective measures you can take should you encounter a problem  
when using a BACnet VAV Actuator.  
You are not required to do any controller troubleshooting. You may want to contact your local  
Siemens Building Technologies representative if a problem occurs or you have any questions  
about the controller.  
NOTE:  
When troubleshooting, record what the problem is and what actions were  
performed immediately before the problem occurred. Being able to describe the  
problem in detail is important, should you need assistance from your local  
Siemens Building Technologies representative.  
Basic Service Information  
Always remove power to the VAV Actuator when installing or replacing it. Since the controller  
does not have a power switch, the recommended method of removing power to a locally  
powered controller is to turn OFF the power to the 24 Vac transformer. The recommended  
method of removing power to a controller on a power cable (even to service a single  
controller) is to turn OFF the power at the transformer.  
NOTE:  
When removing power to a controller to perform maintenance or service, make  
sure that the person in charge of the facility is aware of this and that appropriate  
steps are taken to keep the building in control.  
Never remove the cover from the VAV Actuator. There are no serviceable parts inside. If a  
problem is found with this device, contact your local Siemens Building Technologies  
representative for replacement. An anti-static wrist strap is recommended when installing or  
replacing controllers.  
Preventive Maintenance  
Most controller components are designed so that, under normal circumstances, they do not  
require preventive maintenance. Periodic inspections, voltage checks, and point checks are  
normally not required. The rugged design makes most preventive maintenance unnecessary.  
However, devices that are exposed to dusty or dirty environments may require periodic  
cleaning to function properly.  
Siemens Building Technologies, Inc.  
29  
Troubleshooting  
Safety Features  
The controller board stores the controller's address, applications, and point values. In the  
event of a power failure or a reset, these values are retrieved from the controller's permanent  
memory and are used by the controller unless overridden by a field panel. If one of the  
following conditions occurs, the controller will activate safety features present in its fail-safe  
mode.  
Sensor failure.  
Loss of power. Upon controller power loss, communication with the controller is also  
lost. The controller will appear as failed (*F*) at the field panel.  
Controller LEDs  
To determine if the controller is powered up and working, verify that the Basic Sanity Test  
(BST) Light Emitting Diode (LED) is flashing ON/OFF once per second. The controller  
contains seven LEDs located on the circuit board. See the Controller LED lndicators section  
of Chapter 1, Product Overview for more information about LEDs.  
NOTE:  
The TX and RX LEDs indicate communication over the FLN.  
Automated Checkout  
The BACnet VAV Actuator has a built-in checkout procedure that can be manually initiated at  
any time after the controller has been installed. The procedure tests all of the necessary I/O  
and ensures the controller has the ability to operate within the set airflow range, between  
CLG FLOW MIN and CLG FLOW MAX.  
To perform the checkout procedure, set CHK OUT to YES. When the procedure is  
completed, CHK OUT returns to NO and the results are displayed in CHK STATUS. See  
Table 3.  
Table 3. Possible Failure Value and Description.  
CHK STATUS  
Values  
Description  
-1  
0
Checkout procedure has not been run since last controller initialization.  
No errors found.  
1
Room temperature sensor failed.  
2
Room setpoint dial failed [If STPT DIAL is set to YES].  
Air velocity sensor failed.  
4
8
Controller could not reach CLG FLOW MIN or below.  
Controller could not reach CLG FLOW MAX or above.  
16  
NOTE: Multiple failures are added together and displayed as one value. For example, if the room temperature  
sensor failed (1) and the controller could not reach CLG FLOW MAX, CHK STATUS displays 17.  
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Siemens BACnet VAV Actuator Owner’s Manual  
Failure codes indicate the following possible problems.  
Room temperature sensor failed—CHK STATUS = 1  
1. The cable for the room temperature sensor may be unplugged or loose. Check both ends  
to ensure that the cable is securely seated.  
2. Connect directly to the controller through the room temperature sensor connection on the  
BACnet VAV Actuator and check whether communication is possible. If so, the problem  
lies in the room temperature sensor or its cable. If not, the problem is with the controller.  
3. Contact your local Siemens Building Technologies representative.  
Room setpoint dial failed—CHK STATUS = 2  
1. The cable for the room temperature sensor may be unplugged or loose. Check both ends  
to ensure that the cable is securely seated.  
2. The controller may be incorrectly set to use a setpoint dial with a sensor that does not  
have the dial. If the sensor has no dial, change STPT DIAL (Point 14) from YES to NO.  
3. Connect directly to the controller through the room temperature sensor connection on the  
BACnet VAV Actuator and check whether communication is possible. If so, the problem  
lies in the room temperature sensor or its cable. If not, the problem is with the controller.  
4. Contact your local Siemens Building Technologies representative.  
Air velocity sensor failed—CHK STATUS = 4  
1. The sensor tubing may be blocked, leaking, or disconnected. Check for pinched,  
disconnected, or cracked sensor tubing. Correct as needed.  
2. The tubing connections for the air velocity sensor may be reversed. Repipe if HI and LO  
connections are incorrect.  
The sensor or the BACnet VAV Actuator may be faulty.  
Controller could not reach CLG FLOW MIN or below—CHK STATUS = 8  
1. The actuator may be loose on the shaft. Check that the setscrew is fully tightened against  
the damper shaft. Follow these torque guidelines:  
70 ± 5 inch pounds—solid metal  
37 ± 2 inch pounds—plastic, graphite, composite, or hollow metal (Hollow metal  
shafts require an insert to prevent shaft damage.)  
2. The tubing for the air velocity sensor may be pinched, disconnected, or cracked. Check  
the tubing and correct as needed.  
3. The tubing connections for the air velocity sensor may be reversed. Repipe if HI and LO  
connections are incorrect.  
Siemens Building Technologies, Inc.  
31  
Troubleshooting  
4. Box sizing information may be incorrect. Check the values of the following points and  
correct as needed:  
DUCT AREA  
FLOW COEFF  
CLG FLOW MIN  
CLG FLOW MAX  
5. Motor setup information may be incorrect. Check the values of the following points and  
correct as needed:  
MTR SETUP  
MTR1 TIMING  
DMPR ROT ANG  
6. The box may not have been balanced correctly. Contact your local Siemens Building  
Technologies Representative.  
7. The air velocity sensor may need calibration. Set CAL AIR to YES to run the calibration  
sequence. When CAL AIR returns to NO, indicating that the sequence is finished, run the  
checkout procedure again to see whether the problem has been corrected.  
Controller could not reach CLG FLOW MAX or above—CHK STATUS = 16  
1. Check for the problems described immediately above for CLG FLOW MIN.  
2. The box may be starved for air, either because the central air-handling unit is off or  
because of low duct static.  
32  
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Glossary  
Overview  
The glossary contains terms and acronyms that are used in this manual. For  
definitions of point database descriptors, see Chapter 3, Point Database, in this  
manual.  
AI  
Analog Input. A point receiving a signal that represents a condition that has more  
than two states. For example, flow rate sensors (water or air), temperature sensors  
(room or duct), pressure sensors (static or velocity), and humidity sensors (room,  
duct, or outdoor).  
airflow  
Rate at which a volume of air moves through a duct. Usually expressed in cubic feet  
per minute (cfm) or liters per second (lps).  
algorithm  
Mathematical formula that uses varying inputs to calculate an output value.  
AVS  
AZM  
Air Velocity Sensor.  
Autozero Module. Equipment controller device used to calibrate the Variable Air  
Volume Controller’s internal air velocity transducer without changing the volume of  
air being delivered to a space.  
centralized control  
Type of control offered by a controller that is connected by means of Field Level  
Network (FLN).  
cfm  
Cubic Feet per Minute.  
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33  
Glossary  
control loop  
PID algorithm that is used to control an output that is based on a setpoint and an  
input reading from a sensor.  
DDC  
DI  
Direct Digital Control.  
Digital Input. Physical input point that receives a two-state signal (ON/OFF,  
OPEN/CLOSED, YES/NO).  
DO  
Digital Output. Physical output point that sends a two-state signal (ON/OFF,  
OPEN/CLOSED, YES/NO).  
English units  
The foot-pound-second system of units for weights and measurements.  
equipment controller  
FLN device that provides additional point capacity to a field panel or provides  
individual room or mechanical equipment control.  
field panel  
A device containing a microprocessor for centralized control of system components  
and equipment controllers.  
FLN  
Field Level Network. Network consisting of equipment controllers, FLN end devices,  
fume hoods, etc.  
lps  
Liters per Second.  
loopout  
Output of the control loop expressed as a percentage.  
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Siemens BACnet VAV Actuator Owner’s Manual  
HMI  
Human Machine Interface. Terminal and its interface program that allows you to  
communicate with a field panel or equipment controller.  
override switch  
Button on a room temperature sensor that an occupant can press to change the  
status of a room from unoccupied to occupied (or from night to day) for a  
predetermined time.  
pressure independent  
Variable Air Volume (VAV) room temperature control system in which the  
temperature drives an airflow setpoint.  
PID  
Proportional, Integral, Derivative.  
Room Temperature Sensor.  
RTS  
setpoint  
Virtual point that stores a point value such as a temperature setting. Points that  
monitor inputs, such as temperature, report actual values.  
SI units  
Systeme International d'Unites. The international metric system.  
slave mode  
Default application that displays when power is first applied to an equipment  
controller. No control action is initiated in the slave mode.  
stand-alone control  
Type of control offered by a controller that is providing independent DDC control to a  
space.  
Siemens Building Technologies, Inc.  
35  
Glossary  
Terminal Equipment Controller  
Siemens Building Technologies, Inc. product family of equipment controllers (one is  
the BACnet VAV Controller - Electronic Output) that house the applications software  
used to control terminal units, such as heat pumps, VAV terminal boxes, fan coil  
units, unit ventilators, etc.  
unbundle  
Term used to describe the entering of a point that resides in a controller's database  
into the field panel's database so that it can be monitored and controlled from the  
field panel.  
VAV  
Variable air volume. Ventilation system that changes the amount of air supplied to  
and exhausted from the rooms served.  
36  
Siemens Building Technologies, Inc.  
Index  
using auxiliary points....................................19  
using controller as point extension device...19  
applications  
A
calibration.................................................7, 23  
control loops...................................................6  
control temperature setpoints ........................6  
damper status operation ................................7  
day/night mode...............................................6  
electric reheat  
stage 1........................................1, 8, 15, 17  
stage 2........................................1, 8, 15, 17  
stage 3........................................1, 8, 15, 17  
fail-safe operation...........................................7  
heating and cooling switchover......................7  
hot water reheat .......................1, 8, 13, 16, 18  
modulate damper during heating mode .........7  
night mode override switch ............................6  
notes...........................................................1, 8  
sequencing logic ............................................6  
air velocity sensor  
failure code...................................................30  
troubleshooting.............................................31  
Air Velocity Sensor (AVS)..................................2  
algorithm ..........................................................33  
application 2560  
control drawing ...............................................9  
overview .........................................................9  
application 2561  
control drawing .............................................10  
overview .......................................................10  
application 2562  
baseboard radiation............................1, 11, 12  
control drawing .............................................12  
electric heat ..................................................12  
electric heat interlock....................................11  
overview .......................................................11  
application 2563  
B
control drawing .......................................13, 14  
hot water heat and spare DO .......................13  
overview .......................................................13  
two valve actuators.......................................14  
application 2564  
Basic Sanity Test (BST)...................................30  
basic service information .................................29  
BST LED..........................................................30  
control drawing .............................................15  
overview .......................................................15  
Application 2564  
C
fan operation.................................................15  
application 2565  
control drawing .............................................16  
overview .......................................................16  
Application 2565  
centralized control............................................33  
checkout procedure .........................................30  
CHK OUT (Point 10)........................................30  
CHK STATUS (Point 3) ...................................30  
communication wiring ........................................4  
control loop ......................................................34  
controller  
fan operation.................................................16  
application 2566  
control drawing .............................................17  
fan operation.................................................17  
overview .......................................................17  
application 2567  
control drawing .............................................18  
overview .......................................................18  
Application 2567  
LEDs/LED indicators....................................30  
D
damper  
troubleshooting.......................................31, 32  
DDC .................................................................34  
DI .....................................................................34  
fan operation.................................................18  
Application 2597  
overview .......................................................19  
Siemens Building Technologies, Inc.  
37  
Index  
Direct Digital Control (DDC)...........................1, 6  
DO....................................................................34  
R
related equipment..............................................5  
relay module ......................................................5  
room temperature sensor  
E
failure code...................................................30  
troubleshooting.............................................31  
RTS..................................................................35  
RX LED............................................................30  
English units.....................................................34  
equipment controller...................................34, 36  
F
S
failure codes)....................................................30  
fan ......................................... 1, 3, 15, 16, 17, 18  
FLN...................................................................34  
Floor Level Network (FLN).................................4  
safety features .................................................30  
service information, basic ................................29  
setpoint dial  
failure code...................................................30  
troubleshooting.............................................31  
SI units.............................................................35  
stand-alone control ..........................................35  
static discharge................................................29  
H
hardware  
autozero module.........................................3, 7  
failure codes .................................................30  
fan...................................... 1, 3, 15, 16, 17, 18  
LEDs...............................................................4  
power wiring ...................................................3  
relay module...................................................5  
temperature sensors ......................................4  
T
temperature sensors  
duct temperature sensor................................4  
RTS ................................................................4  
troubleshooting ................................................29  
basic service information..............................29  
TX LED ............................................................30  
L
Light Emitting Diodes (LEDs)...........................30  
BST...............................................................30  
RX and TX....................................................30  
loopout..............................................................34  
U
units, English....................................................34  
O
V
override switch .................................................35  
valve  
2-position heating.................................3, 7, 23  
P
W
PID ...................................................................35  
point database  
overview .......................................................20  
power wiring.......................................................3  
preventive maintenance...................................29  
wiring  
communication wiring.....................................4  
power wiring...................................................3  
38  
Siemens Building Technologies, Inc.  

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