Lennox International Inc Air Conditioner 15CHAX Series User Manual

INSTALLATION  
INSTRUCTIONS  
E 2006 Lennox Industries Inc.  
Dallas, Texas, USA  
15CHAX SERIES UNITS  
PACKAGED ELECTRIC UNIT (2−5 TONS)  
505,201M (38152A082)  
01/08  
Litho U.S.A.  
Supersedes 05/06  
Shipping & Packing List  
1 − Assembled packaged electric unit  
As soon as the unit is received, it should be inspected for  
possible damage during transit. If you find any damage, im-  
mediately contact the last carrier.  
WARNING  
Improper installation, adjustment, alteration, service  
or maintenance can cause property damage, person-  
al injury or loss of life. Installation and service must  
be performed by a licensed professional installer (or  
equivalent) or service agency.  
RETAIN THESE INSTRUCTIONS  
FOR FUTURE REFERENCE  
WARNING  
If this unit is to be installed in a mobile or manufac-  
tured home application, the duct system must be  
sized to achieve static pressures within the  
manufacturer’s guidelines. All other installation  
guidelines must also be followed. Failure to do so  
may result in equipment damage, personal injury  
and improper unit performance.  
Table of Contents  
Shipping & Packing List . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Parts Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
Location Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Rigging & Setting Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Existing Common Vent Systems . . . . . . . . . . . . . . . . . 5  
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Supply & Return Connections . . . . . . . . . . . . . . . . . . . . 6  
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Blower Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
System Operation Monitor . . . . . . . . . . . . . . . . . . . . . . 11  
Unit Start−Up and Operation . . . . . . . . . . . . . . . . . . . . 13  
Condenser Fan Clearances . . . . . . . . . . . . . . . . . . . . . 14  
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
CAUTION  
Danger of sharp metallic edges. Can cause injury.  
Take care when servicing unit to avoid accidental  
contact with sharp edges.  
WARNING  
Electric shock hazard. Can cause injury  
or death. Before attempting to perform  
any service or maintenance, turn the  
electrical power to unit OFF at  
disconnect switch(es). Unit may have  
multiple power supplies.  
01/08  
505,201M  
Page 1  
*2P0108*  
*P505201M*  
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Parts Arrangement  
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General  
duct.  
These installation instructions are intended as a general  
guide only, for use by an experienced, licensed contractor  
(or equivalent).  
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5
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)
The 15CHAX units are single−package electric units  
designed for outdoor installation on a rooftop or a slab. The  
units are equipped with a transformer and blower control  
for applications which do not include electric heat. Electric  
heat sections are available for separate order.  
and 80°F (27°C) must be maintained.  
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moved upon construction completion.  
S The unit components, duct system, air filters and evap-  
orator coil must be thoroughly cleaned following final  
construction clean−up.  
The unit must be sized based on heat loss and heat gain  
calculations made according to the methods of the Air  
Conditioning Contractors of America (ACCA).  
S The unit operating conditions (including airflow, cool-  
ing operation, and heating operation) must be verified  
according to these installation instructions.  
The units are shipped assembled. All piping, refrigerant  
charge, and electrical wiring are factory−installed and  
tested. The units require electric power, condensate drain  
and duct connections at the point of installation.  
Requirements  
These units must be installed in accordance with all  
applicable national and local safety codes.  
These instructions are intended as a general guide and do  
not supersede local codes in any way. Consult authorities  
having jurisdiction before installation.  
Use of this unit as a construction heater or air conditioner is  
not recommended during any phase of construction. Very  
low return air temperatures, harmful vapors and operation  
of the unit with clogged or misplaced filters will damage the  
unit.  
If components are to be added to a unit to meet local codes,  
they are to be installed at the dealer’s and/or customer’s  
expense.  
If this unit has been used for heating or cooling of buildings  
or structures under construction, the following conditions  
must be met or the warranty will be void:  
These units are design listed by UL in both the United  
States and Canada as follows:  
S A room thermostat must control the unit. The use of  
fixed jumpers that will provide continuous heating or  
cooling is not allowed.  
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Page 3  
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Accessory Lift Kit  
WARNING  
Product contains fiberglass wool.  
Lifting Bracket  
Accessory  
Disturbing the insulation in this product during  
installation, maintenance, or repair will expose you  
to fiberglass wool dust. Breathing this may cause  
lung cancer. (Fiberglass wool is known to the State  
of California to cause cancer.)  
Sheet Metal  
Screw  
Fiberglass wool may also cause respiratory, skin,  
and eye irritation.  
To reduce exposure to this substance or for further  
information, consult material safety data sheets  
available from address shown below, or contact your  
supervisor.  
Lennox Industries Inc.  
P.O. Box 799900  
Dallas, TX 75379−9900  
Figure 1  
Location Selection  
Use the following guidelines to select a suitable location for  
these units.  
Clearances  
All units require certain clearances for proper operation  
for combustible construction, servicing, and proper unit  
operation.  
1 − Unit is designed for outdoor installation only. Unit must  
be installed so all electrical components are protected  
from water.  
2 − Condenser coils must have an unlimited supply of air.  
3 − For ground level installation, use a level pre−fabricated  
pad or use a level concrete slab with a minimum thick-  
ness of 4 inches. The length and width should be at  
least 6 inches greater than the unit base. Do not tie the  
slab to the building foundation.  
Service Clearances  
3 (156)*  
REAR  
4 − Maintain level within a tolerance of 1/4 inch maximum  
across the entire length or width of the unit.  
24  
(610)  
30  
(762)  
Rigging & Setting Unit  
Exercise care when moving the unit. Do not remove any  
packaging until the unit is near the place of installation. An  
optional lifting lug kit (92M51) may be purchased  
separately for use in rigging the unit for lifting. Spreaders  
MUST be used across the top of the unit. Recommended  
spreader length: 2, 2−1/2, 3−ton units −− 44"; 3−1/2, 4, 5−ton  
units −− 54".  
FRONT  
48 (1219)  
*Rear clearance is 18" (457) when required for  
accessory maintenance.  
NOTE − Top Clearance − 36 in. (914 mm)  
NOTE − Entire perimeter of unit base requires  
support when elevated above mounting surface.  
CAUTION  
Before lifting a unit, make sure that the weight is dis-  
Figure 2  
tributed equally on the cables so that it will lift even-  
ly.  
NOTE − Do not permit overhanging structures or shrubs to  
obstruct condenser air discharge outlet.  
Units may also be moved or lifted with a forklift while still in  
the factory supplied packaging.  
In the U.S. units may be installed on combustible floors  
made from wood or class A, B, or C roof covering material.  
In Canada, units may be installed on combustible floors.  
NOTE − Length of forks must be a minimum of 42 inches.  
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ate Category 1 Natural Gas and Propane appliances  
venting sizing tables in the current standards of the  
CSA B149 Natural Gas and Propane Installation  
Codes in Canada.)  
Existing Common Vent Systems  
The 15CHAX packaged cooling units with auxiliary electric  
heat may replace an existing furnace which is being re-  
moved from a venting system commonly run with separate  
gas appliances. In this case, the existing vent system is  
likely to be too large to properly vent the remaining at-  
tached appliances.  
Condensate Drain  
The 15CHAX unit is equipped with a 3/4 inch FPT coupling  
for condensate line connection. Plumbing must conform to  
local codes. Use a sealing compound on male pipe  
threads.  
Conduct the following test while each appliance is operat-  
ing and the other appliances (which are not operating) re-  
main connected to the common venting system. If the vent-  
ing system has been installed improperly, you must  
correct the system as indicated in the general venting re-  
quirements section.  
The drain line must be properly trapped and routed to a  
The drain line must pitch to an open drain or pump a  
minimum of 1 inch per 10 feet to prevent clogging of the  
line. Seal around drain connection with suitable material to  
prevent air leakage into return air system.  
1 − Seal any unused openings in the common venting sys-  
tem.  
2 − Inspect the venting system for proper size and horizon-  
tal pitch. Determine that there is no blockage, restric-  
tion, leakage, corrosion, or other deficiencies which  
could cause an unsafe condition.  
NOTE − Drain line connection may not carry the weight of  
the unsupported drain line. Support the drain line, if  
necessary.  
3 − Close all building doors and windows and all doors be-  
tween the space in which the appliances remaining  
connected to the common venting system are located  
and other spaces of the building. Turn on clothes dry-  
ers and any appliances not connected to the common  
venting system. Turn on any exhaust fans, such as  
range hoods and bathroom exhausts, so they will oper-  
ate at maximum speed. Do not operate a summer ex-  
haust fan. Close fireplace dampers.  
Drain piping should not be smaller than drain connection at  
coil. An open vent in drain line will some times be required  
due to line length, friction and static pressure. Drains  
should be constructed in a manner to facilitate future clean-  
ing.  
NOTE − The condensate drain line MUST be trapped to  
provide proper drainage.  
4 − Follow the lighting instructions. Turn on the appliance  
that is being inspected. Adjust the thermostat so that  
the appliance operates continuously.  
CAUTION  
Condensate line connection must be hand−tight-  
ened. Do not use tools.  
5 − After the main burner has operated for 5 minutes, test  
for leaks of flue gases at the draft hood relief opening.  
Use the flame of a match or candle, or smoke from a  
cigarette, cigar, or pipe.  
Typical Condensate Drain  
6 − After determining that each appliance connected to the  
common venting system is venting properly, (step 3)  
return all doors, windows, exhaust fans, fireplace  
dampers, and any other gas−burning appliances to  
their previous mode of operation.  
Unit  
Drain Connection  
1.00” Min.  
7 − If a venting problem is found during any of the preced-  
ing tests, the common venting system must be modi-  
fied to correct the problem.  
3.00” Min.  
12.00”  
Max.  
Resize the common venting system to the minimum  
vent pipe size determined by using the appropriate  
tables in Appendix G. (These are in the current stan-  
dards of the National Fuel Gas Code  
ANSI-Z223.1/NFPA 54 in the USA, and the appropri-  
Positive Liquid Seal Required  
Figure 3  
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Filters  
Removing Supply and Return  
Air Opening Covers  
Filters are not factory−supplied with the unit; however,  
optional internally installed filter kits are available. Filter kit  
92M54 is used with 2, 2−1/2 and 3−ton units. Filter kit 92M55  
is used with 3−1/2, 4 and 5−ton units. The filter kits  
accommodate the use of 1", 2" or 4" filters. If the optional  
filter kit is not used, a filter must be field−installed.  
2
1
1.ꢀRemove screw and lift.  
2.ꢀSlide cover to free back pin.  
Base  
Filters must always be installed ahead of evaporator coil  
and must be kept clean or replaced. Dirty filters will reduce  
Figure 4  
Table 1  
Unit Filter Size  
The upper return air opening cover must be removed when  
®
the PureAir air purification system (PCO20−28) is being  
Unit Model  
Filter Size  
Filter Quantity  
used. In PCO applications, both upper and lower return air  
openings must be covered by the return air plenum to  
ensure proper PCO operation. The upper return air  
opening is not required in horizontal applications when the  
PCO is not used.  
−24, −30, −36  
−42, −48, −60  
20 in. X 25 in.  
16 in. X 25 in.  
1
2
®
®
The Healthy Climate PureAir air purification system  
(PCO20−28) may be used with 15CHAX units installed in  
horizontal air discharge applications only. Installation  
hardware kit (Y0629) is required to install the PCO20−28  
(X8787) in the packaged unit. The PCO20−28 is designed  
for universal voltage, and is ready to operate at 208/230V.  
When used, the PCO should be installed before the unit is  
set in place and before the duct connections are made.  
Compressors  
Units are shipped with the compressor mountings  
factory−adjusted and ready for operation.  
CAUTION  
Do not loosen compressor mounting bolts.  
Supply & Return Duct Connections  
Electrical  
The duct system should be designed and sized according  
to the methods in Manual Q of the Air Conditioning  
Contractors of America (ACCA).  
All wiring should be done in accordance with the  
current National Electric Code ANSI/NFPA No. 70 in  
the United States. In Canada, wiring must be done in  
accordance with the current CSA C22.2 Part 1. Local  
codes may take precedence.  
A closed return duct system shall be used. This shall not  
preclude use of economizers or outdoor fresh air intake. It  
is recommended that supply and return duct connections  
at the unit be made with flexible joints.  
Use wiring with a temperature limitation of 75_C min.; run  
the 208 or 230 volt, 60 hertz electric power supply through a  
fused disconnect switch to control box of unit and connect  
as shown in the wiring diagram located on the inside of the  
control access panel. Refer to figure 5 for electrical access.  
The supply and return air duct systems should be designed  
for the CFM and static requirements of the job. They  
should NOT be sized by simply matching the  
dimensions of the duct connections on the unit.  
Ducting installed outdoors MUST be insulated and  
waterproofed.  
CAUTION  
When fastening duct system to side duct flanges on  
unit, insert screws through duct flanges only. Do not  
insert screws through casing. Outdoor duct must be  
insulated and waterproofed.  
The 15CHAX unit is shipped ready for horizontal air  
discharge (side duct connections). If bottom air discharge  
is desired, the covers must be removed from the supply  
and return air openings on the bottom of the unit and  
re−installed to cover the side openings.  
Figure 5  
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Unit must be electrically grounded in accordance with local  
codes or in the absence of local codes with the National  
Electric Code, ANSI/NFPA No. 70 (latest edition) or CSA  
C22.2 Part 1 (latest edition).  
the installation instructions packaged with the electric heat  
section.  
Thermostat  
The room thermostat should be located on an inside wall  
where it will not be subject to drafts, sun exposure or heat  
from electrical fixtures or appliances. Follow  
manufacturer’s instructions enclosed with thermostat for  
general installation procedure. Color coded insulated wires  
(# 18 AWG) should be used to connect thermostat to unit.  
Power supply to the unit must comply with all applicable  
codes and NEC or CEC. A fused disconnect switch should  
be field provided for the unit. The switch must be separate  
from all other circuits. If any of the wire supplied with the  
unit must be replaced, replacement wire must be of the  
type shown on the wiring diagram.  
Electrical wiring must be sized to carry minimum circuit  
ampacity marked on the unit. USE COPPER  
CONDUCTORS ONLY. Each unit must be wired with a  
separate branch circuit and be properly fused.  
Typical Single−Phase Unit Wiring Connections  
WARNING  
Unit is equipped with a single−pole contactor. Line  
voltage is present at all components when unit is not  
in operation. Disconnect all remote electric power  
supplies before opening access panel. Unit may  
have multiple power supplies. Failure to disconnect  
all power supplies could result in personal injury or  
death.  
CAUTION  
When connecting electrical power and control wir-  
ing to the unit, waterproof type connectors MUST be  
used so that water or moisture cannot be drawn into  
the unit during normal operation.  
WARNING  
Unit must be grounded in accordance with national  
and local codes. Failure to ground unit properly can  
result in personal injury or death.  
See figure 6 for typical field wiring connections and figure 7  
for typical unit wiring diagram.  
Optional Electric Heat  
Optional electric heat is available and must be purchased  
separately. Install the electric heat section as outlined in  
Figure 6  
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Figure 7  
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Read through the jumper settings section before adjusting  
the jumper to obtain the appropriate blower speed.  
Blower Control Board (A54)  
To change jumper positions, gently pull the jumper off the  
pins and place it on the desired set of pins. The following  
section outlines the different jumper selections available  
!
WARNING  
Electric shock hazard. Can cause injury or  
death. Before attempting to perform any  
service or maintenance, turn the electrical  
power to unit OFF at disconnect  
switch(es). Unit may have multiple power  
supplies.  
After the CFM for each application has been determined,  
the jumper settings must be adjusted to reflect those given  
in tables 2, 3 and 4. From the tables, determine which row  
most closely matches the desired CFM. Once a specific  
row has been chosen (+, NORMAL, or −), CFM volumes  
from other rows cannot be used. Below are descriptions of  
the jumper selections.  
15CHAX units are equipped with a variable speed motor  
that is capable of maintaining a specified CFM throughout  
the external static range. A particular CFM can be obtained  
by positioning jumpers (COOL, HEAT, and ADJUST) on  
the blower control board. The HEAT and COOL jumpers  
are labeled A, B, C and D. Each of the numbers corre-  
sponds with an air volume (CFM) setting. The ADJUST  
jumper is labeled Test, −, +, and Norm. The + and − pin set-  
tings are used to add or subtract a percentage of the CFM  
selected. The Test jumper is used to operate the motor in  
The variable speed motor slowly ramps up to and down  
from the selected air flow during both cooling and heating  
demand. This minimizes noise and eliminates the initial  
blast of air when the blower is initially energized.  
ADJUST  
The ADJUST pins allow the motor to run at normal speed,  
approximately 15 percent higher, or approximately 15 per-  
rows (+, NORMAL, and −) with their respective CFM vol-  
umes. Notice that the normal adjustment setting for cool  
speed position D in table 2 is 900 CFM. The + adjustment  
setting for that position is 1035 CFM and for the − adjust-  
ment setting is 765 CFM. After the adjustment setting has  
been determined, choose the remaining speed settings  
from those offered in the table in that row.  
Factory settings for the blower speed jumpers are given in  
rect air volume for operation in heat and cool mode.  
The CFM LED located on the blower control board flashes  
one time per 100 cfm to indicate selected blower speed.  
For example, if the unit is operating at 1000 CFM, CFM  
LED will flash 10 times. If the CFM is 1150, CFM LED will  
flash 11 full times plus one fast or half flash.  
The TEST pin is available to bypass the blower control and  
run the motor at approximately 70 percent to make sure  
that the motor is operational. This is used mainly in trouble-  
shooting. The G terminal must be energized for the motor  
to run.  
At times the light may appear to flicker or glow. This takes  
place when the control is communicating with the motor be-  
tween cycles. This is normal operation.  
BLOWER CONTROL BOARD (A54)  
ADJUST  
SELECTOR PINS  
(Setting affects both  
heating and cooling  
modes)  
16−PIN PLUG  
(BOARD TO MOTOR)  
HEATING SPEED  
SELECTOR PINS  
DIAGNOSTIC  
LED  
COOLING SPEED  
SELECTOR PINS  
Figure 8  
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COOL  
CONTINUOUS FAN  
The COOL jumper is used to determine the CFM during  
cooling operation. This jumper selection is activated for  
cooling when Y1 is energized.  
When the thermostat is set for ꢁContinuous Fan" operation  
and there is no demand for heating or cooling, the blower  
control will provide 50 percent of the COOL CFM selected.  
The blower motor runs at 80 percent of the selected air flow  
for the first 7−1/2 minutes of each cooling demand. This fea-  
ture allows for greater humidity removal and saves energy.  
In the cooling mode, the blower control board delays  
blower operation for 5 seconds after the compressor starts.  
The blower continues to operate for 90 seconds after the  
compressor is de−energized.  
NOTE − With the proper thermostat and subbase, continu-  
ous blower operation is possible by closing the R to G cir-  
cuit. Cooling blower delay is also functional in this mode.  
DEHUMIDIFICATION  
The blower control board includes an HUM terminal which  
provides for connection of a humidistat. The JV1 resistor  
on the blower control board must be cut to activate the  
HUM terminal. The humidistat must be wired to open on  
humidity rise. When the dehumidification circuit is used,  
the variable speed motor will reduce the selected air flow  
rate by 25 percent when humidity levels are high. An LED  
(D1) lights when the blower is operating in the dehumidifi-  
cation mode.  
HEAT  
The HEAT jumper is used to determine CFM during back-  
up electric heat operation only. These jumper selections  
are activated only when W is energized.  
In the backup heat mode, the blower continues to operate  
for 2 minutes after the heating demand is satisfied.  
NOTE − Due to the nature of electric heat, CFM settings are  
limited.  
Table 2  
15CHAX−24, 15CHAX−30 Blower Performance  
0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range  
Jumper Speed Positions  
ꢀAD-  
JUST"  
ꢀCOOL" Speed  
ꢀHEAT" Speed  
ꢀCONTINOUS FAN" Speed  
A
B
C
D
A
B
C
D
A
B
C
D
Jumper  
Setting  
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s  
+ 1150 545 920 435 690 325 1035 490 1150 545 1150 545 1150 545 1150 545 575 270 460 215 345 165 520 245  
NORM 1000 470 800 380 600 285 900 425 1000 470 1000 470 1000 470 1000 470 500 235 400 190 300 140 450 210  
− 850 400 680 320 510 240 765 360 1000 470 1000 470 1000 470 1000 470 425 200 340 160 300 140 385 180  
Table 3  
15CHAX−36 Blower Performance  
0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range  
Jumper Speed Positions  
ꢀHEAT" Speed  
ꢀAD-  
ꢀCOOL" Speed  
ꢀCONTINOUS FAN" Speed  
JUST"  
Jumper  
Setting  
A
B
C
D
A
B
C
D
A
B
C
D
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s  
+ 1380 650 1150 545 920 435 1265 575 1380 650 1380 650 1150 545 1150 545 690 325 575 270 460 215 635 300  
NORM 1200 565 1000 470 800 380 1100 520 1200 565 1200 565 1000 470 1000 470 600 285 500 235 400 190 550 260  
− 1020 480 850 400 680 320 935 440 1200 565 1200 565 1000 470 1000 470 510 240 425 200 350 165 470 220  
Table 4  
15CHAX−42, 15CHAX−48, 15CHAX−60, Blower Performance  
0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range  
Jumper Speed Positions  
ꢀHEAT" Speed  
ꢀAD-  
ꢀCOOL" Speed  
ꢀCONTINOUS FAN" Speed  
JUST"  
Jumper  
Setting  
A
B
C
D
A
B
C
D
A
B
C
D
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s  
+ 2070 975 1840 870 1610 760 1380 650 1610 760 1610 760 1610 760 1610 760 1035 490 920 435 805 380 690 325  
NORM 1800 850 1600 755 1400 660 1200 565 1400 660 1400 660 1400 660 1400 660 900 425 800 380 700 330 600 285  
− 1530 720 1360 640 1190 560 1020 480 1400 660 1400 660 1400 660 1400 660 765 360 680 320 595 280 510 240  
Page 10  
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LSOM LED Functions  
System Operation Monitor (LSOM)  
Power LED (green) −− Voltage within the range of  
19−28VAC is present at the system monitor power connec-  
tion.  
The system operation monitor (A132) detects the most  
common fault conditions in the air conditioning system.  
When an abnormal condition is detected, the module com-  
municates the specific condition through its ALERT and  
TRIP lights. The module is capable of detecting both me-  
the system operation monitor.  
Alert LED (yellow) −− Communicates an abnormal system  
condition through a unique flash code. The alert LED  
flashes a number of times consecutively; then pauses;  
then repeats the process. This consecutive flashing corre-  
sponds with a particular abnormal condition.  
Trip LED (red) −− Indicates a demand signal from the ther-  
mostat; but detects no current to the compressor.  
System Operation Monitor (A132)  
Flash code number −− Corresponds to a number of LED  
flashes, followed by a pause, and then repeated.  
POWER LED  
DATA OUTPUT  
DATA OUTPUT  
Trip & Alert LEDs flashing simultaneously −− Indicates that  
the control circuit voltage is too low for operation.  
CONNECTOR  
Y
.25" SPADE  
CONNECTOR (5)  
C
Reset ALERT flash code by removing 24VAC power from  
monitor. Last ALERT flash code will display for 1 minute af-  
ter monitor is powered on.  
R
ALERT LED  
TRIP LED  
Figure 9  
IMPORTANT  
This monitor does not provide safety protection. The  
monitor is a monitoring device only and cannot con-  
trol or shut down other devices.  
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Table 5  
System Operation Monitor LED Troubleshooting Codes  
Status LED Condition Status LED Description Status LED Troubleshooting Information  
Green ꢀPower" LED ON Module has power  
24VAC control power is present at the module terminal.  
Determine/verify that both R and C module terminals are connected  
and voltage is present at both terminals.  
Green ꢀPower" LED  
OFF  
Red ꢀTrip" LED ON  
Module not powering up  
1.  
System and compressor  
check out OK  
Verify Y terminal is connected to 24VAC at contactor coil.  
Verify voltage at contactor coil falls below 0.5VAC when off.  
2.  
3.  
Verify 24VAC is present across Y and C when thermostat  
demand signal is present; if not present, R and C wires are reversed.  
1.  
Thermostat demand signal  
Y1 is present, but compres-  
sor not running  
Compressor protector is open.  
Outdoor unit power disconnect is open.  
Compressor circuit breaker or fuse(s) is open.  
Broken wire or connector is not making contact.  
Low pressure switch open if present in the system.  
Compressor contactor has failed to close.  
2.  
3.  
4.  
5.  
6.  
Red ꢀTrip" & Yellow  
ꢀAlert" LEDs Flashing  
Simultaneous flashing.  
Indicates that the control circuit voltage is too low for operation.  
1.  
Yellow ꢀAlert" Flash  
Code 1*  
Long Run Time −  
Compressor is running  
extremely long run cycles  
Low refrigerant charge.  
Evaporator blower is not running.  
2.  
3.  
Evaporator coil is frozen.  
Faulty metering device.  
4.  
5.  
6.  
7.  
.
Condenser coil is dirty  
Liquid line restriction (filter drier blocked if present)  
.
.
Thermostat is malfunctioning  
1.  
2.  
Yellow ꢀAlert" Flash  
Code 2*  
System Pressure Trip −  
Discharge or suction pres-  
sure out of limits or  
High head pressure.  
Condenser coil poor air circulation (dirty, blocked, dam-  
aged).  
3.  
4.  
5.  
compressor overloaded  
Condenser fan is not running.  
Return air duct has substantial leakage.  
If low pressure switch is present, see Flash Code 1 info.  
1.  
2.  
3.  
4.  
Yellow ꢀAlert" Flash  
Code 3*  
Short Cycling − Compres-  
sor is running only briefly  
Thermostat demand signal is intermittent.  
Time delay relay or control board is defective.  
If high pressure switch is present, see Flash Code 2 info.  
If low pressure switch is present, see Flash Code 1 info.  
1.  
2.  
3.  
4.  
Yellow ꢀAlert" Flash  
Code 4*  
Locked Rotor  
Open Circuit  
Run capacitor has failed.  
Low line voltage (contact utility).  
Excessive liquid refrigerant in the compressor.  
Compressor bearings are seized.  
1.  
2.  
3.  
4.  
5.  
6.  
Yellow ꢀAlert" Flash  
Code 5*  
Outdoor unit power disconnect is open.  
Unit circuit breaker or fuse(s) is open.  
Unit contactor has failed to close.  
High pressure switch is open and requires manual reset.  
Open circuit in compressor supply wiring or connections.  
Unusually long compressor protector reset time due to  
extreme ambient temperature.  
7.  
Compressor windings are damaged.  
1.  
2.  
3.  
Yellow ꢀAlert" Flash  
Code 6*  
Open Start Circuit −  
Current only in run circuit  
Run capacitor has failed.  
Open circuit in compressor start wiring or connections.  
Compressor start winding is damaged.  
1.  
2.  
Yellow ꢀAlert" Flash  
Code 7*  
Open Run Circuit − Current  
only in start circuit  
Open circuit in compressor start wiring or connections.  
Compressor start winding is damaged.  
1.  
2.  
Yellow ꢀAlert" Flash  
Code 8*  
Welded Contactor −  
Compressor always runs  
Compressor contactor failed to open.  
Thermostat demand signal not connected to module.  
1.  
2.  
Yellow ꢀAlert" Flash  
Code 9*  
Low Voltage − Control  
circuit <17VAC  
Control circuit transformer is overloaded.  
Low line voltage (contact utility).  
*Flash code number corresponds to a number of LED flashes, followed by a pause, and then repeated. Reset ALERT flash code  
by removing 24VAC power from monitor; last code will display for 1 minute after monitor is powered on.  
Page 12  
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immediately stop. The circulating air blower continues  
operating through a 90−second delay.  
Unit Start−Up and Operation  
Each 15CHAX packaged cooling unit is factory−charged  
with R−410A refrigerant. The compressor is hermetically  
sealed, internally sprung and base−mounted with  
rubber−insulated hold−down bolts.  
Unit compressors have internal protection. If there is an  
abnormal rise in the compressor temperature, the  
protector will open and the compressor will stop.  
System Performance  
Pre−Start Check List:  
For maximum performance of this cooling system, the  
operating temperatures and pressure should be checked  
and subcooling determined at Standard ARI test conditions  
of 82_ F outdoor temperature / 80_ F indoor dry bulb / 67_ F  
indoor wet bulb. If subcooling measured deviates from  
accordingly for maximum performance.  
1 − Make sure refrigerant lines do not rub against the cabi-  
net or each other.  
2 − Inspect all electrical wiring, both factory− and field−  
installed, for loose connections.  
3 − Check voltage at the disconnect switch. Voltage must  
be within the range listed on the unit nameplate. If not,  
consult power company and have voltage condition  
corrected before starting unit.  
Table 6  
Suction Superheat Values  
4 − Recheck voltage with unit running. If power is not with-  
in the range listed on the unit nameplate, stop the unit  
and consult the power company. Check unit amper-  
age. Refer to unit nameplate for correct running amps.  
Suction Superheat  
82_ F OD / 80_ F IDDB  
/ 67_ F IDWB  
Unit Model No.  
15CHAX−24  
15CHAX−30  
12  
_
_
5 − Make sure filter is in place before unit start−up.  
15CHAX−36  
15  
6 − Before placing the unit into full operation, energize the  
unit for three false starts. Energize the compressor  
just long enough for it to make a few revolutions, wait  
five to seven minutes before repeating a second and  
third time.  
15CHAX−42  
15CHAX−48  
15CHAX−60  
10_  
guide. Table 7 should not be used for charging unit. Minor  
variations in these pressures may be expected due to dif-  
ferences in installations. Significant differences could  
mean that the system is not properly charged or that a prob-  
lem exists with some component in the system.  
Cooling Sequence of Operation  
When the thermostat calls for cooling, the ꢁR" to ꢁY" circuit  
is closed to energize the compressor contactor. The  
contactor brings on both the compressor and outdoor fan.  
The thermostat also closes the ꢁR" to ꢁG" circuit to energize  
the circulating air blower. When the cooling demand is  
satisfied, the thermostat opens the circuits, as well as the  
compressor contactor. The compressor and outdoor fan  
Used carefully, this table could serve as a useful service  
guide. Data is based on 80°F dry bulb / 67°F wet bulb return  
air. Allow unit operation to stabilize before taking pressure  
readings.  
Table 7  
Normal Operating Pressures  
80°F db / 67°F wb RETURN AIR  
Air Temperature Entering Outdoor Coil (°F)  
UNIT  
PRESSURE  
65  
70  
75  
80  
82  
85  
90  
95  
100  
150  
148  
155  
143  
148  
149  
379  
390  
410  
383  
391  
418  
105  
151  
149  
155  
144  
149  
150  
398  
408  
429  
402  
408  
436  
110  
152  
151  
157  
145  
150  
151  
430  
440  
461  
434  
440  
468  
115  
153  
152  
157  
147  
151  
152  
457  
470  
493  
457  
470  
497  
15CHAX−24  
15CHAX−30  
15CHAX−36  
15CHAX−42  
15CHAX−48  
15CHAX−60  
15CHAX−24  
15CHAX−30  
15CHAX−36  
15CHAX−42  
15CHAX−48  
15CHAX−60  
142  
134  
143  
140  
140  
143  
219  
232  
244  
225  
243  
257  
143  
136  
144  
140  
141  
144  
242  
255  
268  
247  
264  
280  
144  
138  
146  
140  
142  
145  
264  
277  
292  
269  
285  
303  
146  
140  
147  
141  
144  
146  
287  
300  
316  
291  
307  
326  
146  
141  
148  
141  
144  
146  
296  
309  
326  
300  
315  
335  
147  
142  
149  
141  
145  
147  
310  
323  
340  
314  
328  
349  
148  
144  
151  
142  
146  
147  
333  
345  
363  
337  
349  
372  
149  
146  
152  
142  
147  
148  
355  
368  
369  
357  
370  
395  
Suction  
Liquid  
Page 13  
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Motors  
Condenser Fan Clearances  
Indoor, outdoor fan and vent motors are permanently  
lubricated and require no further lubrication. Motors should  
be cleaned yearly to prevent the accumulation of dust and  
dirt on the windings or motor exterior.  
The top of the condenser fan should be 1−1/2 inches from  
the bottom of the top grille. This dimension should be  
checked and the fan should be adjusted accordingly any  
time servicing of the outdoor fan system is required.  
Coil  
Dirt and debris should not be allowed to accumulate on the  
coil surfaces or other parts in the air conditioning circuit.  
Cleaning should be performed as often as necessary. Use  
a brush, vacuum cleaner attachment, or other suitable  
means. If water is used to clean the coil, be sure the power  
to unit is shut off prior to cleaning.  
Maintenance  
At the start of each cooling season, this equipment should  
be serviced by a licensed professional technician (or  
equivalent). Periodic inspection and maintenance normally  
consists of changing or cleaning filters.  
NOTE − Care should be used when cleaning the coil so that  
the coil fins are not damaged.  
Filters  
Not supplied. Inspect once a month. Replace disposable or  
clean permanent type as necessary. DO NOT replace per-  
manent type with disposable.  
Do not permit the hot condenser air discharge to be ob-  
structed by overhanging structures or shrubs.  
Accessories  
LENNOX Cat.  
Description  
Number  
92M54  
92M55  
X8787  
Y0629  
Filter Kit (2−ton to 3−ton capacity units)  
Filter Kit (3−1/2−ton to 5−ton capacity units)  
PCO20−28  
Installation Hardware Kit for PCO20−28  
Page 14  
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