LG Electronics Air Conditioner LP121CEM Y8 User Manual
Internal Use Only  
http://biz.lgservice.com  
Window Air Conditioner  
SVC MANUAL  
MODEL : LP121CEM-Y8  
CAUTION  
Before Servicing the unit, read the safety precautions in General SVC manual.  
Only for authorized service personnel.  
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1.2 FEATURES AND BENEFITS  
The PTAC has many features, some of which are different than those found on conventional PTAC units. The servicer must be  
familiar with these features in order to properly service the unit.  
THE SLEEVE AND THE REAR GRILLE  
(Available as an option)  
REAR GRILLE  
(Aluminum Rear Grille)  
VERTICAL AIR DEFLECTOR  
(Horizontal Louver)  
SLEEVE ASSEMBLY  
(Including Aluminum Rear Grille)  
AIR FILTER  
I N D O O R  
INLET GRILLE  
(Air Intake)  
EXPANDED METAL GRILLE  
(Superior for a performance)  
• IIR (Infinite Impulse Response)  
The IIR function senses the temperature several times per second and makes micro-adjustments several times per  
• Compressor Restart Delay  
This feature extends the overall life of compressor by preventing the short-cycling of the air-conditioner. When the compressor  
restarts, LG PTAC is designed to give a minimum of three minutes to have a time of equalizing the refrigerant pressures for  
optimizing cycling.  
• Fan-Only Setting - High/Low  
The fan can run at HIGH or LOW speed without COOLING or HEATING to provide air circulation and ventilation.  
• Indoor Fan Speed Selections - High/Low  
The fan can run at HIGH or LOW speed for either COOLING or HEATING.  
• Two Fan motors  
The unit has two fan motors to provide quiet operation and maximum efficiency.  
• LED Diagnostics  
All units have this feature indicating the problem when the unit is not operating properly with easy-to-read diagnostics. For  
example, 1 blink every 2 seconds indicates compressor failure.  
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• Indoor Filters  
The unit uses two indoor filters which slide in and cut easily. The filters may be cleaned by washing and brushing without  
removing the front grille.  
• Rotary Compressor  
The unit uses a rotary compressor for quiet, reliable operation and long life.  
• 2 Position Discharge Grille  
The discharge grille can provide air flows upward at an angle of 40 off vertical or 15 degree off vertical. The angle is changed  
by removing the front grille and 4 screws that fasten the discharge grille to the front grille and rotating the louvers to an  
alternate position.  
• Indoor Room Freeze Protection  
When the unit senses the room temperature falls to less than 40° F the unit activates the fan motor and either the electric  
resistance heater or the hydronic heater to prevent pipes or fixtures from freezing. This also overrides front desk control of the  
unit mounted or wall mounted controls.  
• Door Switch/Occupancy Sensor  
The unit is capable of accommodating a field installed door switch and occupancy sensor to operate the energy management  
feature. For additional information, refer to the unit operation section.  
• Compressor Overload Protection  
This feature prevents the damage of the compressor by sensing the indoor tube temperature in heating. If the indoor  
temperature is over 130˚ F, the outdoor fan will be switched off and back on when the temperature drops below 120˚ F.  
• Outdoor Air Temperature Switchover  
This will effectively change the unit from heat pump mode to total electric resistance heat.  
• Temperature limits  
The unit is programmed to provide both heating and cooling temperature limits by dip switches on control panel from 50˚ F to  
90˚ F. Temperature limits help to prevent overheating and overcooling and reduce energy costs.  
• Condensate Drain Valve  
The unit has a condensate drain valve to prevent water from collecting or freezing in the basepan.  
• Quick Heater Recovery  
The unit is designed to operate the electric heater to warm the room to the temperature set point as soon as heat pump cycle  
is on in heating. This feature has an advantage of reducing the time to reach the set point and improving the temperature  
increase for better comfort.  
• Reverse Cycle Defrosting - (PTHPs only)  
The unit will activate the reverse cycle defrost when the outdoor coil temperature has remained at a cold temperature to form  
the ice on the coil.This ice will reduce airflow though the coil and will also reduce the efficiency of unit. The LG PTHP will  
employ an active reverse cycle defrost function to melt the ice off the outdoor coil for insuring room comfort conditions and  
savings from extended operation.  
• High Temperature Heat Pump Operation Protection  
The compressor will be switched off to prevent damage when the heat pump is operated in high outdoor temperatures.  
• Remote Thermostat Control  
Each unit is built to be operated from any standard 4 or 5 wire remote-mounted thermostat, if desired. The unit has a built-in  
low voltage power source which can accommodate a large variety of thermostat choices-manual, auto changeover, or  
programmable. A remote thermostat can also be added to any installed unit.  
• Zone Sensor  
Occupants enjoy ultimate comfort with consistent climate control. Attach an optional, inexpensive remote Zone Sensor to  
exactly match the functions of the PTAC without disabling any features.  
- 4 -  
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1.3 CONTROL LOCATIONS  
• OPERATION  
COOLING ONLY MODEL  
OPERATION MODE SELECTOR  
OFF  
Turns air conditioner off.  
LOW FAN  
Low speed fan operation without cooling.  
HIGH FAN High speed fan operation without cooling.  
LOW COOL Cooling with the low speed fan operation.  
HIGH COOL Cooling with the high speed fan operation.  
LOW HEAT Heating with the low speed fan operation.  
HIGH HEAT Heating with the high speed fan operation.  
ELECTRIC HEATING MODEL  
TEMPERATURE CONTROL  
Set the Thermostat control to the desired temperature  
mark 5 (the mid-point is a good starting position). If the  
room temperature is not satisfactory after a reasonable  
time, adjust the control to a cooler or warmer setting, as  
appropriate.  
• VENTILATION  
The ventilation lever is located to the lower left side of the unit.  
The ventilation lever must be in the CLOSE position in order  
to maintain the best cooling conditions.  
When fresh air is necessary in the room, set the ventilation  
lever to the OPEN position.  
VENT  
CLOSE  
VENT  
OPEN  
The damper is opened and outdoor air is drawn into the room.  
This will reduce the cooling or heating efficiency.  
CAUTION  
When the air conditioner has performed a cooling or  
heating operation and is turned off or set to the fan  
position, wait at least 3 minutes before resetting to the  
cooling operation.  
NOTE  
A slight heat odor may come from the unit when first  
switching to HEAT after the cooling season is over.  
This odor, caused by fine dust particles on the heater, will  
disappear quickly. This is harmless.  
- 5 -  
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1.4 ADDITIONAL CONTROLS  
• REMOVING THE FRONT GRILLE  
Additional controls are available after removing the front grille  
and option cover of control box.  
To remove the front grille, pull out the bottom of front grille and  
then lift up.  
To replace the front grille, place the tabs over the top of the  
unit and push the bottom of front grille until the clips snap into  
place.  
• ADDITIONAL CONTROLS  
The additional controls are located behind the option cover of control box. The standard settings will be in the OFF position.  
The authorized service man has to check switches and ensure the switches are in the desired position.  
REMOTE ON  
ON  
ON  
ON  
ON  
OFF  
LOCAL  
1
OFF OFF OFF OFF  
2
3
4
5
Remote/Local  
Energy Saver  
Temperature Limit 1  
Temperature Limit 2  
Temperature Limit 3  
• TEMPERATURE LIMITING  
Temperature Limiting can save money by limiting the lowest temperature for cooling and the highest temperature for heating.  
The temperature limiting is controlled by dip switch #1 - #3.  
This temperature limiting is not available with the Remote Wall Thermostat.  
Temperature  
Limit #1  
OFF  
ON  
Temperature  
Limit #2  
OFF  
OFF  
ON  
Temperature  
Limit #3  
OFF  
OFF  
OFF  
OFF  
ON  
Cooling Operation  
Heating Operation  
Lowest Temp. Highest Temp. Lowest Temp. Highest Temp.  
54°F (12.2°C) 86°F (30.0°C) 54°F (12.2°C) 86°F (30.0°C)  
56°F (13.3°C) 86°F (30.0°C) 54°F (12.2°C) 84°F (28.9°C)  
58°F (14.4°C) 86°F (30.0°C) 54°F (12.2°C) 82°F (27.8°C)  
60°F (15.5°C) 86°F (30.0°C) 54°F (12.2°C) 80°F (26.7°C)  
62°F (16.6°C) 86°F (30.0°C) 54°F (12.2°C) 78°F (25.5°C)  
64°F (17.7°C) 86°F (30.0°C) 54°F (12.2°C) 76°F (24.4°C)  
66°F (18.9°C) 86°F (30.0°C) 54°F (12.2°C) 74°F (23.3°C)  
68°F (20.0°C) 86°F (30.0°C) 54°F (12.2°C) 72°F (22.2°C)  
OFF  
ON  
ON  
OFF  
ON  
OFF  
OFF  
ON  
ON  
OFF  
ON  
ON  
ON  
ON  
- 6 -  
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• REMOTE/LOCAL CONTROL  
When remote/local switch #1 is on, it allow the unit to operate by the control of Remote Wall Thermostat. The unit control by  
knobs are not available.  
• ENERGY SAVER  
The energy saver switch #2 is on. This switch is set at continuous fan to provide continuous fan operation in cool or heat  
modes. When the switch is off the continuous fan allows continuous circulation of room air and make the more balanced  
temperature of the room. When the switch is on the fan is on or off with the compressor or with the heater.  
• FRONT DESK CONTROL  
When the pair wire is connected to the connector LOand LI, the unit can be turned ON or OFF with a switch located at the  
Front Desk Control panel. When the front desk switch is ON, the fan operate according to the condition of setting without  
working compressor and heater. When the front desk switch is OFF, the unit can operate according to the setting of controls.  
Wire # AWG  
#22  
Maximum Length  
600ft(180m)  
Note:The following figures show  
wiring schematics for heat pump  
and straight cool units with electric  
heat, respectively.  
#20  
900ft(270m)  
#18  
1500ft(450m)  
2000ft(610m)  
#16  
Wiring Schematic for  
Remote Heat Pump  
LO LI GL GH  
O
W
Y
R
C
Front Desk Switch  
• REMOTE WALL THERMOSTAT  
When the wires are connected, the unit will be controlled by a  
remote wall thermostat.  
The thermostat connections supply the 24 Volt AC. When you  
install the digital / electronic thermostat, you must set it to the  
24 Volt AC. See the installation Instruction in this manual for  
the Remote Wall Thermostat.  
Wiring Schematic for  
Straight Cool Unit.  
24 Volt-N  
24 Volt-L  
Compressor  
Heater  
Reversing Valve  
High Fan  
Low Fan  
LO LI GL GH  
O
W
Y
R
C
(Molex Housing Spec 396-09V)  
- 7 -  
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2. Disassembly Instructions  
— Before the following disassembly, POWER SWITCH is set to OFF and disconnected the power cord.  
2.1 MECHANICAL PARTS  
2.1.1 FRONT GRILLE  
1. Remove the front grille. (See Figure 1)  
2. To remove the front grille, pull out the bottom of  
the front grille and then lift up.  
Re-install the component by referring to the  
removal procedure.  
3. To replace the front grille, place the tabs over the  
top of the unit and push the bottom of front grille  
until the clips snap into place.  
Figure 1  
• This Room Air Conditioner (PTAC) discharges air  
from the top of the unit through reversible, 2-position  
discharge grille louvers. The unit is shipped from the  
40˚  
factory with the discharge grille louvers at an angle  
of 40˚ off vertical. In the alternate position, the  
louvers will be at an angle of 15˚ off vertical.  
15˚  
Screws  
To adjust air direction, remove the front grille.  
Remove the 4 screws that fasten the discharge grille  
to the front grille.  
Flip the discharge grille 180°, then reattach the  
discharge grille to the front grille with 4 screws.  
- 8 -  
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2.1.2 CONTROL BOX  
1. Remove the front grille. (Refer to section 2.1.1)  
2. Remove the two screws which fasten the control  
box. (See Figure 2)  
3. Pull the control box from the Air guide.  
Figure 2  
4. Remove the control box cover. (See Figure 3)  
5. Disconnect wire housings on the control box.  
Figure 3  
6. Pull the control box assembly out from the unit.  
(See Figure 4)  
7. Re-install the components by referring to the  
removal procedure.  
Figure 4  
- 9 -  
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2.2 AIR HANDLING PARTS  
2.2.1 ELECTRIC HEATER  
(ELECTRIC HEATER MODEL ONLY)  
1. Remove the front grille.(Refer to section 2.1.1)  
2. Remove the control box assembly.  
(Refer to section 2.1.2)  
3. Remove the 4 screws which fasten the Evaporator.  
(See Figure 5)  
Figure 5  
4. Remove the top cover assembly, net steel, brace.  
(See Figure 6)  
Figure 6  
5. Remove the 6 screws which fasten the Air-guide.  
6. Pull the Air-guide assembly out from the unit.  
(See Figure 7)  
Figure 7  
7. Remove the 2 screws which fasten the electric  
heater in the left hand side.  
8. Pull the electric heater towards left for a while and  
then lift up vertically to disassemble it completely  
from Air guide.  
Figure 8  
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2.2.2 CROSS FLOW FAN  
1. Remove the front grille. (Refer to section 2.1.1)  
2. Remove the control box assembly.  
(Refer to section 2.1.2)  
3. Remove the Air-Guide Assembly from the unit.  
(Refer to section 2.2.1)  
4. Loosen the screw on the cross flow fan.  
(See Figure 9)  
Figure 9  
5. Remove the 4 screws which fasten the indoor  
motor and the earth wire. (See Figure 10)  
6. Remove the supports on both sides.  
7. Pull the cross flow fan out from the air-guide.  
8. Re-install the components by referring to the  
removal procedure.  
Figure 10  
2.2.3 AXIAL FAN  
1. Remove the brace.  
2. Remove the 4 screws which fasten the condenser  
with the shroud and the basepan. (See Figure 11)  
3. Remove the condenser sideways carefully.  
Figure 11  
4. Remove the clamp which secures the fan with  
pliers.(See Figure 12)  
5. Remove the axial fan.  
6. Re-install the components by referring to the  
removal procedure.  
Figure 12  
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2.2.4 SHROUD  
1. Remove the axial fan. (Refer to section 2.2.3)  
2. Remove the 4 screws which fasten the condenser  
with the shroud and the basepan. (See Figure 11)  
3. Remove the shroud.  
4. Re-install the component by referring to the  
removal procedure.  
2.3. ELECTRICAL PARTS  
2.3.1 OUTDOOR MOTOR  
1. Remove the clamp cord and disconnect a wire  
housing in control box. (Refer to section 2.1.2)  
2. Remove the axial fan. (Refer to section 2.2.3)  
3. Remove the 2 screws which fasten the motor.  
(See Figure 14)  
Figure 13  
4. Remove the motor  
5. Re-install the component by referring to the  
removal procedure, above.  
2.3.2 INDOOR MOTOR (Refer to section 2.2.2)  
2.3.3 COMPRESSOR  
1. Discharge the refrigerant system using a  
refrigerant recovery system.  
Figure 14  
If there is no valve to attach the recovery system,  
install one (such as a WATCO A-1) before venting  
the refrigerant. Leave the valve in place after  
servicing the system.  
2. Disconnect the 3 leads from the compressor.  
3. After purging the unit completely, unbraze the  
suction and discharge tubes at the compressor  
connections.  
4. Remove the 3 nuts and the 3 washers which  
fasten the compressor. (See Figure 15)  
5. Remove the compressor.  
6. Re-instill the components by referring to the  
removal procedure, above.  
Figure 15  
2.3.4 CAPACITOR  
1. Remove the control box. (Refer to section 2.1.2)  
2. Remove 1 screw and disconnect the leads which  
connected to the box type capacitor.  
(See Figure 16)  
3. Remove 1 screw and the clamp which fastens the  
can-type capacitor.  
4. Disconnect all the leads of capacitor terminals.  
5. Re-install the components by referring to the  
removal procedure, above.  
Figure 16  
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2.3.5 POWER CORD  
1. Remove the control box. (Refer to section 2.1.2)  
2. Disconnect the grounding screw from the control  
box.  
3. Disconnect 2 receptacles.  
4. Remove a screw which fastens the clip cord.  
5. Separate the power cord from the control box.  
(See Figure 17)  
6. Re-install the component by referring to the  
removal procedure, above.  
(Use only one ground-marked hole  
connection.)  
for ground  
7. If the supply cord of this appliance is damaged, it  
must be replaced by an exact replacement part.  
(The special cord means the cord which has the  
same specification marked on the supply cord  
fitted to the unit.)  
Figure 17  
2.3.6 P.C.B.  
1. Remove the escutcheon.  
2. Remove the two knobs.  
3. Remove the 2 screws which fasten P.C.B. cover.  
4. Disconnect all the leads which connected to the  
P.C.B.  
5. Remove the two screws which fasten the P.C.B.  
board.  
6. Re-install the components by referring to the  
removal procedure, above.  
Figure 18  
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2.4 REFRIGERATION CYCLE  
CAUTION  
Discharge the refrigerant system using a  
refrigerant recovery system.  
If there is no valve to attach the recovery system,  
install one (such as a WATCO A-1) before  
venting the refrigerant. Leave the valve in place  
after servicing the system.  
2.4.1 CONDENSER  
1. Remove the brace and the shroud.  
(Refer to section 2.2.2)  
2. Remove the 4 screws which fasten the shroud.  
(Refer to section 2.2.2)  
Figure 19  
3. Push forward the shroud and remove the 2 screws  
which fasten the condenser with the basepan.  
4. After discharging the refrigerant completely,  
unbraze the interconnecting tube at the condenser  
connections.  
5. Remove the condenser.  
6. Re-install the components by referring to notes.  
(See Figure 19)  
2.4.2 EVAPORATOR  
1. Remove the front grille. (Refer to section 2.1.1)  
2. Discharge the refrigerant completely.  
3. Remove the control box assembly.  
(Refer to section 2.1.2)  
Figure 20  
4. Remove the 4 screws which fasten the evaporator  
at the left side and the right side.  
5. Move the evaporator sideward carefully and then  
unbraze the interconnecting tube at the evaporator  
connectors.  
6. Remove the evaporator.  
7. Re-install the components by referring to notes.  
(See Figure 20)  
2.4.3 CAPILLARY TUBE  
1. After discharging the refrigerant completely,  
unbraze the interconnecting tube at the capillary  
tube.  
2. Remove the capillary tube.  
3. Re-install the components by referring to notes.  
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NOTES  
— Replacement of the refrigeration cycle.  
1. When replacing the refrigeration cycle, be sure to  
discharge the refrigerant system using a  
refrigerant recovery system.  
6. Recharge as follows :  
1) Refrigeration cycle systems are charged from the  
high-side. If the total charge cannot be put  
in the high-side, the balance will be put in the  
suction line through the access valve which you  
installed as the system was opened.  
2) Connect the charging cylinder as shown in Figure 21  
B.  
If there is no valve to attach the recovery system,  
install one (such as a WATCO A-1) before venting  
the refrigerant. Leave the valve in place after  
servicing the system.  
2. After discharging the unit completely, remove the  
desired component, and unbraze the pinch-off  
tubes.  
With valve C open, discharge the hose at the  
manifold connection.  
3. Solder service valves into the pinch-off tube ports,  
leaving the valves open.  
4. Solder the pinch-off tubes with service valves.  
5. Evacuate as follows.  
3) Open valve A and allow the proper charge to  
enter the system. Valve B is still closed.  
4) If more charge is required, the high-side will not  
take it. Close valve A.  
1) Connect the vacuum pump, as illustrated  
Figure 21 A.  
5) With the unit running, open valve B and add the  
balance of the charge.  
2) Start the vacuum pump, slowly open manifold  
valves A and B with two full turns  
a. Do not add the liquid refrigerant to the low-  
side.  
counterclockwise and leave the valves closed.  
The vacuum pump is now pulling through valves  
A and B up to valve C by means of the manifold  
and entire system.  
b. Watch the low-side gauge; allow pressure to  
rise to 30 lbs.  
c. Turn off valve B and allow pressure to drop.  
d. Repeat steps B and C until the balance of the  
charge is in the system.  
6) When satisfied the unit is operating correctly,  
use the pinch-off tool with the unit still running  
and clamp on to the pinch-off tube. Using a tube  
cutter, cut the pinch-off tube about 2 inches from  
the pinch-off tool. Use sil-fos solder and solder  
pinch-off tube closed. Turn off the unit, allow it to  
set for a while, and then test the leakage of the  
pinch-off connection.  
CAUTION  
If high vacuum equipment is used, just crack  
valves A and B for a few minutes, then open  
slowly with the two full turns counterclockwise.  
This will keep oil from foaming and being  
drawn into the vacuum pump.  
3) Operate the vacuum pump for 20 to 30 minutes,  
until 600 microns of vacuum are obtained. Close  
valves A and B, and observe the vacuum gauge  
for a few minutes. A rise in pressure would  
indicate a possible leak or moisture remaining in  
the system. With valves A and B closed, stop  
the vacuum pump.  
4) Remove the hose from the vacuum pump and  
place it on the charging cylinder. See Figure 21 B.  
Open valve C.  
Discharge the line at the manifold connection.  
5) The system is now ready for final charging.  
- 15 -  
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Equipment needed: Vacuum pump, charging cylinder, manifold gauge, brazing equipment. pinch-off tool capable  
of making a vapor-proof seal, leak detector, tubing cutter, hand tools to remove components, service valve.  
COMPOUND GAUGE  
CONDENSER  
(HIGH PRESSURE SIDE)  
MANIFOLD  
GAUGE  
A
B
CAPILLARY TUBE  
SEE INSETS  
BELOW  
EVAPORATOR  
(LOW PRESSURE SIDE)  
COMPRESSOR  
HI  
LOW  
A
B
A
B
EXTERNAL  
VACUUM PUMP  
CHARGING  
CYLINDER  
C
Figure 21 A-Pulling Vacuum  
Figure 21 B-Charging  
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3. Installation  
Dimension of air conditioner  
3.1 HOW TO INSTALL THE UNIT  
CAUTION  
1,066 mm  
(42")  
• There are sharp edges that can cause serious cuts.  
• When lifting the air conditioner, it is HEAVY.  
Use 2 people to lift.  
For existing sleeve, you should measure the wall sleeve  
dimensions.  
406 mm  
(16")  
Install the new air conditioner according to these installation  
instructions to achieve the best performence. All wall sleeves  
used to mount the new air conditioner must be in good  
structural condition and have a rear grille that securely  
attaches to the sleeve or the flange of the sleeve to secure the  
new air conditioner.  
349 mm  
3
(13 /4")  
505 mm  
(20")  
Dimension of sleeve assembly (optional)  
• To avoid vibration and noise, make sure the unit is installed  
securely and firmly.  
42"  
1/2" SQ. HOLE (2 REQ'D.)  
2-3/4"  
1/2"  
1-1/2" TYP  
16"  
5-5/8"  
4"  
When installing the sleeve, make certain there is nothing  
within 20" of the back that would interfere with heat radiation  
and exhaust air flow.  
6"  
1/2" DIA.  
HOLE (3 REQ'D.)  
21"  
36"  
Wall opening 16-1/4"x42-1/4"  
Insulation strip must be attached to prevent the re-circulation of exhaust air  
to inward side from the either side of condenser space. The insulation  
strip is provided with the box.  
Recommended  
Refer to the diagram below.  
GRILLE  
INSULATION  
SLEEVE  
WALL  
WALL  
COOLED  
HEAT  
RADIATION  
AIR  
TOP VIEW  
13-3/4"  
INTAKE  
AIR  
1/4" Bubble  
of the level  
FRONT  
GRILE  
42"  
Over 20"  
1) Take out the insulation strip from the upper packing.  
280 mm  
(11")  
Insulation Strip  
Front  
2) Attach the insulation strip onto the rear upper side of the  
wall sleeve.  
Sleeve  
3) To improve unit energy efficiency, it is recommended the  
change of outside grille for an unit protection and an  
addition of a plastic rear grille. (This is optional.)  
4) Insulation strip prevents the exhaust air from re-entering  
from either side of condenser space which may decrease  
the cooling efficiency of condenser.  
Rear  
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3.2 WALL SLEEVE INSTALLATION  
For new construction, early planning with the architect  
is necessary. Unit location, electrical connection  
locations, and wall openings of the proper dimensions  
are essential to avoid the necessity of rework, fillers,  
framing, moving electrical outlets, and other expensive  
modifications.  
3.2.1 Wall Case Installation Data  
For existing construction it is important that carpentry,  
masonry and electrical work be performed by  
competent, qualified personnel. Since installations in  
existing construction may involve removal of  
building material from the structure, locating the  
wall case must be done correctly.  
General  
Generally, units are installed 3" to 5" above the floor  
(flush to finished floor installation is possible) as near to  
the center of the room as possible; underneath a  
window or a glass panel is typical. Normal installation of  
the wall case allows installation flexibility; from flush  
with the finished interior wall to a minimum of 1/4" of the  
wall case extending beyond the finished exterior of the  
building.  
Special consideration must be given to installations  
where the wall case does not extend a minimum of 1/4"  
beyond the finished exterior wall.  
Regardless of the installation, there are several things  
to consider when selecting a location for installing the  
unit. For instance, drapery location could interfere with  
air discharge, and placement of furniture may have an  
impact on the performance of the unit. The following  
information is intended to minimize installation  
problems and assure you of trouble-free installation.  
Refer to page 17 for required wall opening dimensions.  
Minimum recommended interior and exterior case  
projection for standard wall thicknesses are shown in  
the drawings in this manual. The case may be installed  
flush with the finished indoor wall.  
Mounting an outdoor grille or louver section to the  
building face may cause a space between the outdoor  
coil and the louver section. Air splitters, aligned with the  
ends of the outdoor coil, must be installed between the  
outdoor coil inlet and outlet air streams. Gaps between  
the outdoor coil and the louver section may allow  
condenser air recirculation and affect the operation of  
the unit.  
The wall case should be level from side to side  
and from level to 1/4 bubble tilt to the outdoors.  
The condensate disposal system in the unit is  
designed to dissipate the condensate water  
generated during cooling operation in  
accordance with ARI standards and actually  
uses this water for maximum unit efficiency. A  
level unit will also insure proper performance of  
the Internal Condensate Removal (ICR) system  
optional on heat pump units.  
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The outside edge of the wall case should extend at least  
1/4" beyond the outside wall.  
3.2.2 PREPARATION OF THE FRONT  
GRILLE  
This is necessary for proper caulking, to prevent sealing  
thedrain holes in the rear flange of the wall case, and to  
facilitate the installation of an accessory drain, if used.  
2. The wall case should be secured to the wall at both sides.  
Use a minimum of two screws or other fastening device on  
each side. See Figure 23 page 20. Mark the wall case on  
each side 2" from the bottom and 2" from the top at a point  
where basic wall structure is located. Drill wall case and  
use fasteners appropriate for wall construction. All holes for  
fasteners in the side of the wall case must be at least 2" up  
from the bottom of the wall case. Never locate screws or  
put other holes in the bottom of the wall case.  
If the wall opening is greater than the case dimensions,  
spacers must be used on the sides between the wall case  
and the wall support structure to prevent distorting the wall  
case.  
3. Caulk or gasket the entire opening on the outside between  
the wall case and exterior wall surface (4 sides) to provide  
total water and air seal.  
4. Caulk or gasket room-side opening between wall case and  
interior wall surface (4 sides). Opening beneath or around  
the wall case can allow outdoor air to leak into the room  
resulting in increased operating costs and improper room  
temperature control.  
Carefully remove shipping tape from the front grille.  
Shipping Tape  
Brick, Frame, Stucco and Shingle Construction  
For new construction, the opening for the wall case should be  
framed and the wall case inserted into the opening during  
construction. Lintels should be used when the building  
material is heavy and is not self supporting (such as brick).  
The wall case will fit an opening of six courses of standard  
brick or five courses of jumbo brick. Wall framing in this type  
construction is normally on 16" centers and the wall case will  
fit a framed opening spanning three 16" O.C. 2" x 4" stud  
spaces.  
Care should be taken in location of electrical supply entry  
in relationship to wall sleeve to assure access to  
receptacle or junction box once unit is installed.  
For existing construction the indoor and outdoor wall will need  
to be cut out, allowing for clearances of 1/8" on all sides of the  
wall case. Work should begin on the inside wall.  
Cut the correct dimensions and mark (using drill holes) the  
outside wall from each corner of the inside cutout. Studding  
that interferes with the opening must be removed and a  
suitable frame constructed to secure the wall case and  
provide adequate support for case and chassis.  
Preparation of the Wall Case for All Types of  
Construction  
As shipped, the LG wall sleeve is ready for installation.  
Do not remove the stiffener from inside the wall case or the  
weather closure panel from the outside face of the wall case  
until the outdoor grille and chassis are ready to be installed.  
Installation of Wall Case in Wall Opening  
1. Position the wall case into the wall. The room side edge of  
the wall case should be at least flush with the finished wall  
for line cord installations and permanent connection  
installations when no sub-base is used, and should project  
into the room at least 2-3/8" when a sub-base is used. If the  
minimum exterior dimensions are not met, refer to page 20.  
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3.2.3 UNIT INSTALLATION  
1. Remove the shipping screw from the ventilation door.  
(See Figure 24)  
Figure 24  
2. Remove the front gille by pulling it out at the bottom to  
release it, then lift it up along the unit top front.  
(See Figure 25)  
Figure 25  
3. Slide the unit into the wall sleeve and secure with 6 screws  
through the unit flange holes. (See Figure 26)  
Figure 26  
4. Reinstall the front grille by hooking the top over the unit top,  
then pushing it in at the bottom. (See Figure 27)  
Figure 27  
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3.3 ELECTRICAL REQUIREMENTS  
3.3.1 ELECTRICAL DATA (FOR 230/208V MODEL)  
CAUTION  
1. Do not use an extension cord with this unit.  
2. When the unit is in the OFF position, the power supply to the  
electrical controls is still energized.  
Tandem  
15 A  
3. Disconnect the power to the unit before servicing  
the unit.  
4. Remove the power cord from the wall receptacle.  
5. Remove or turn off the protective device (fuses or circuit breaker).  
Perpendicular  
20 A  
Wirings including installation of the receptacle must comply with the  
NEC and local codes, local regulations.  
Large Tandem  
30 A  
FUSE- Use a time-delay fuse or circuit breaker. Refer to the nameplate  
for proper power supply requirements.  
230/208 volt receptacle configuration  
3.3.2 ELECTRICAL SAFETY  
IMPORTANT GROUNDING INSTRUCTIONS  
The air conditioner has a three-prong grounding plug on its power supply cord which must be plugged into properly grounded  
three-prong wall receptacle for your protection against possible shock hazard.  
FUSE – Use a time-delay fuse or circuit breaker. Refer to the nameplate for proper power supply requirements.  
208, 230, and 208/230 VOLT UNITS  
These units are equipped with a three-prong grounding plug on the power supply cord which must be plugged into a matching  
properly grounded three-prong wall receptacle for your protection against possible shock hazard. If such an outlet is not  
present, one must be installed by a qualified electrician in accordance with the National Electrical Code and local codes and  
ordinances.  
NOTE: DO NOT USE AN EXTENSION CORD on 208, 230, and 208/230 Volt units.  
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4. Field Installed Accessories  
Note: The installation and servicing of this equipment must be performed by qualified,  
experienced technicians  
NOTICE:  
Warnings and Cautions appear at appropriate sections throughout this manual. Read these carefully.  
WARNING - Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.  
CAUTION - Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may  
also be used to alert against unsafe practices.  
CAUTION –Indicates a situation that may result in equipment or property-damage-only accidents.  
2. Remove existing door assembly by lifting door halfway and  
using both hands, bow door just enough for door hinge pins  
to slide out of mating holes. (Figure 29)  
Control Panel Key Lock  
Part No: AYCP101  
Figure 29 - Door Removal  
Description  
The Key Lock kit prevents tampering of the controls used to  
set temperatures and heating or cooling functions.  
Receiving  
Upon receipt of the product, inspect the shipping carton for  
signs of visible damage. Report any damage or shortage to  
3. Install the new door assembly with the key lock by bowing  
the carrier and note it on the delivery receipt. Unit must be  
the door with both hands and aligning the door hinge pins  
stored in its original shipping carton in a dry, secure place  
with their bracket in the front. (Figure 30)  
prior to its installation and use.  
Important Note:  
Installation  
Personal Risk Hazard Underwriter’s Laboratories Inc. listed.  
For institutional use only where supervisory monitoring is  
available.  
Any other use may increase the risk of personal injury or  
property damage.  
The installation and servicing of the equipment referred to in  
this booklet should be performed by qualified, experienced  
technicians.  
1. Remove front from unit by pulling bottom out and then  
lifting upward. (Figure 28)  
Figure 30 - New Door Installation  
Figure 28 - Remove Front  
Door  
Hinge Pins  
(Each Side)  
Brackets  
(Each Side)  
Front  
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1. Remove front plastic cover by rotating bottom outward and  
then lifting up and out from chassis.  
Condensate Disposal Pump Kit  
Installation  
2. Unplug and remove the PTAC chassis from the wallsleeve.  
Movethe chassis where the front and back of the chassis  
can be easily accessed.  
Part No: AYSB2101  
Description  
3. Remove the wire junction box cover by removing four  
screws and lifting up as shown in figure 31.  
The internal condensate pump serves as a means for  
disposing of condensate generated during heat pump  
operation by transferring it to the indoor coil. The warm coil  
surface and the warm room air help in evaporation of the  
condensate while adding humidity to the room.  
Figure 31  
As with any equipment of this type, the addition of this kit will  
decrease the effective heating capacity of the unit. This kit is  
not intended for use in seacoast or corrosive environments.  
NOTE:  
Under extreme high humidity conditions, the internal  
condensate pump may not be able to dispose of all the  
condensate produced, and condensate would then drip from  
the outside of the wall sleeve. If this condensation is  
unacceptable, then a drain system (including factory  
approved drain kit for the wall sleeve) should be installed.  
4. Remove and set aside the air discharge screen by  
unscrewing the 5 screws on the top.  
5. Remove the one screws holding the control board cover as  
shown figure 32.  
Remove the cover by lifting it up so its free from its hinges,  
and put aside.  
Receiving  
Upon receipt of the product, inspect the shipping carton for  
signs of visible damage. Report any damage or shortage to  
the carrier and note it on the delivery receipt. Unit must be  
stored in its original shipping carton in a dry, secure place  
prior to its installation and use.  
Figure 32  
Installation  
The installation and servicing of the equipment referred to in  
this booklet should be performed by qualified, experienced  
technicians.  
WARNING  
6. Unplug the electric heater connecter located inside the wire  
junction box.  
Hazardous Voltage!  
Disconnect all electric power, including remote disconnects  
before servicing. Follow proper lockout/tagout procedures to  
ensure the power can not be inadvertently energized. Failure  
to disconnect power before servicing could result in death or  
serious injury.  
Important Note:  
The unit OFF switch does not disconnect all electrical power  
to this unit.  
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7. Remove the screw that attaches the electric heater wire to  
the side of the indoor fan housing.  
11. Install tube #1 and tube #2 (ref. fig. 38) on the pump  
assembly using the rubber elbows as shown in fig. 35.  
8. Remove the 3 screws which fasten the top cover assembly.  
Figure 35  
Figure 33  
12. Position pump assembly to the basepan as shown in fig.  
36 and fasten the pump bracket to the basepan using the  
three screws provided.  
9. Position water spraying plastic tube into the electric heater  
cover. Make sure that the three pairs(total of six) of plastic  
tongues snap into the corresponding metal slots of the  
heater frame as shown in fig. 34. Then install one of the  
three rubber elbows(ref. fig. 38) at the inlet of the spraying  
tube and through the rubber grommet.  
Figure 36  
Figure 34  
13. Insert tube #2 of the pump assembly through the plastic  
grommet of the sheet metal partition as shown in fig. 37.  
Then connect the end of tube #2 to the plastic elbow  
coming out of the inlet of the spraying tube.  
10. Place the top cover assembly back into the unit.  
Figure 37  
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15. Assembly the unit back following the  
reverse order of disassembly.  
NOTE: All tube should be inserted into rubber  
elbows by at least 1/2 inch  
Figure 38  
Spraying  
Tube  
Pump  
assembly  
Figure 39  
Tube #1  
Rubber  
elbows(3)  
Tube #2  
Figure 40  
14. Connect the condensate pump to the ICR  
relay of the terminal of the board as shown  
in fig. 40 Make sure to fasten the pump  
wire through the wire clip on the back side  
of the control barrier as shown in fig. 39  
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Note:  
Architecture Grille Aluminum - Single  
Pack  
A baffle kit must not be used with a stamped aluminum grille  
on any PTAC installation.  
Part No: AYAGALA01  
Stamped Aluminum Grille  
Stamped Aluminum Grille  
1. Prepare the wall sleeve for installation of the grille by  
removing the cardboard stiffener and rear enclosure panel  
from the sleeve. These items may be removed from inside  
of the building.  
Note:  
Architecture Grille  
The sleeve stiffener must be taken out before the rear sleeve  
enclosure panel can be removed from the sleeve.  
2. Prepare the stamped aluminum grille for installation on the  
sleeve by inserting the six (6) plastic grommets into the  
square holes located near the outer edges of all four sides  
of the grille. With the grille positioned so the flanges of all  
four sides are in the up position, insert the grommets so the  
square end protrudes through the grille in the opposite  
direction from the flanges.  
Description  
Outdoor grilles are attached to the wall sleeve and exposed to  
the exterior wall. The grilles are an industry standard size of  
42" x 16".  
3. Turn the grille so it can be removed through the rear sleeve  
opening.  
4. Install the stamped aluminum grille by aligning the guide  
pins located in the lower right and left hand corners of the  
grille with the corresponding holes in the rear of the wall  
sleeve.  
Receiving  
Upon receipt of the product, inspect the shipping carton for  
signs of visible damage. Report any damage or shortage to  
the carrier and note it on the delivery receipt. The unit must  
be stored in its original shipping carton in a dry, secure place  
prior to its installation and use.  
5. Secure the grille by threading each of the screws into the  
plastic grommets.  
6. Remove the wire handle (not shown in the picture) from the  
center of the grille prior to installing the chassis into the  
sleeve.  
Installation  
The installation and servicing of the equipment referred to in  
this booklet should be performed by qualified, experienced  
technicians.  
Note:  
Be sure to keep a firm grip on wire handle and grille to  
prevent it from dropping and/or causing possible injury or  
property damage.  
WARNING  
Hazardous Voltage!  
Architectural Grille  
Disconnect all electric power, including remote disconnects  
before servicing. Follow proper lockout/tagout procedures to  
ensure the power can not be inadvertently energized. Failure  
to disconnect power before servicing could result in death or  
serious injury.  
1. Remove the cardboard sleeve stiffener and the rear  
enclosure of the sleeve as described in Step 1 of the  
stamped aluminum grille instructions.  
2. Turn the grille so it can be removed through the rear sleeve  
opening.  
Important Note:  
The unit OFF switch does not disconnect all electrical power  
to this unit.  
3. Install the grille by aligning the four screws supplied to their  
corresonding holes in the architectural grille.  
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4. Secure the grille to the sleeve by tightening the four screws  
to their corresponding holes in the grille.  
Receiving  
Upon receipt of the product, inspect the shipping carton for  
signs of visible damage. Report any damage or shortage to  
the carrier and note it on the delivery receipt. The product  
must be stored in its original shipping carton in a dry, secure  
place prior to its installation and use.  
5. Remove the wire handle after the installation is complete.  
Note:  
The stamped aluminum grille includes 6 screws, washers,  
nuts, and plastic grommets. The architectural grille includes 4  
screws.  
Installation  
The installation and servicing of the equipment referred to in  
this booklet should be performed by qualified, experienced  
technicians.  
Condensate Drain kit  
Part No: AYDR101  
Figure 41 – Components of Drain Kits  
DRAIN FITTING  
PLATE B  
BLANK-OFF  
PLATE C  
BLANK-OFF  
PLATE C  
GASKETS A  
Description  
Condensate water will drain from the chassis into the sleeve  
during normal heat pump operation. This can also occur  
during times of high humidity when in cooling operation.  
Install either the outdoor or indoor drain kit components to  
control the condensate water where normal drainage from the  
wall sleeve is not possible or undesirable. See Figure 35 for  
all components of the drain kit.  
1/2" DRAIN FITTING  
MTG. SCREWS  
MTG. SCREWS  
BLANK-OFF  
PLATE D  
GASKET E FOR  
PLATE D  
WARNING  
Hazardous Voltage!  
Disconnect all electric power, including remote disconnects  
before servicing. Follow proper lockout/ tagout procedures to  
ensure the power can not be inadvertently energized. Failure  
to disconnect power before servicing could result in death or  
serious injury.  
Drain Installation  
Note:  
The optional drain kit serves only as a link between the unit  
and field-supplied condensate drain system.  
Installing the kit without connecting it to a drainage system  
will result in inadequate condensate removal, possible  
leakage and corrosion.  
Important Note:  
The unit OFF switch does not disconnect all electrical power  
to this unit.  
Algaecide: Some algaecide products may cause damage to  
the unit basepan and therefore should not be used. Contact  
your sales representative when considering the use of a  
commercial algaecide. See Figure 41 for components of the  
drain kit.  
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Figure 42 – Outdoor Drain Kit Installation  
contact the front edge of sleeve. Secure the chassis to the  
wall sleeve on each side with screws provided.  
Re-install the cabinet front.  
DRAIN FITTING  
PLATE B  
BLANK-OFF  
PLATE C  
See the following pages for installation instructions of indoor  
drain kit.  
1/2" DRAIN  
FITTING  
Figure 43  
Figure 44  
GASKETS A  
MTG. SCREWS  
Outdoor Drain Kit Installation  
PLATE "B"  
Before installing the wall sleeve louvered condenser grille, it  
must be determined if the optional outdoor wall sleeve drain  
kit is to be installed. The drain kit will allow the condensate  
from the outdoor and indoor coils to be routed to a suitable  
area. The drain kit can be installed so the condensate can be  
drained from the right or left hand side of the wall sleeve. See  
Figure 42. See local codes for proper condensate disposal.  
G
DRAIN FITTING  
Figure 45  
To install the outdoor drain components proceed as follows:  
1. Remove the rear enclosure panel and the sleeve stiffener.  
These items may be removed from the inside of the  
building.  
BLANK-OFF PLATE  
SHEET METAL SCREWS  
2. The drain fitting can be installed on the left or right hand  
side of the sleeve. (Illustration will be for a right hand  
installation.) Insert the drain fitting in the opening of gasket  
A and hole of plate B. Secure this assembly to the rear of  
the sleeve with two sheet metal screws into holes G  
provided in sleeve. See Figures 43 and 44.  
Figure 46  
3. Locate the other gasket A on the back of blank off plate C  
and secure the assembly to the left rear of wall sleeve with  
sheet metal screws provided. See Figure 45 for finished left  
hand side installation.  
See Detail A  
Sleeve overflow port  
Do not close up this port  
Gasket (2)  
(4) Mounting Screws  
If the unit chassis is to be installed right away, install the  
condenser grille to wall sleeve with hardware provided. See  
condenser grille installation instructions.  
Blank-off Plate (2)  
Wall Sleeve Bottom  
Gasket  
If the unit chassis will not be installed right away, replace the  
rear enclosure panel in the wall sleeve. This will help protect  
the inside of the building from weather damage.  
Cover  
Plate  
1/2" Outdoor Drain Fitting  
Detail A  
MTG. Screws (2)  
If a subbase is used, be sure the right hand subbase cover is  
removed before the chassis is installed in the sleeve. Slide  
the chassis into the wall sleeve until the chassis flanges  
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Indoor Drain Kit Installation  
Leveling Legs  
Part No: AYLL101  
The internal drain is installed on the bottom of the wall sleeve  
when it is required to drain the condensate into a drain  
system inside of the building.  
The components of the wall sleeve drain kit are shown in  
Detail A. Use components C (2), D, E, mounting screws (6)  
and the Outdoor drain fitting.  
Description  
Leveling legs are designed to provide extra front support and  
leveling of the wall sleeve. Two leg assemblies are required  
per unit and are provided in each kit. Four screws are also  
provided with each kit for attachment to the wall  
sleeve. See Figure 48.  
1. The components D, E, and drain fitting of the kit are  
mounted on the bottom of the wall sleeve prior to the  
installation of the sleeve. It may be located in a feasible  
area on the bottom of the sleeve which is inside of the  
room except when a subbase is used. When a subbase is  
installed, the drain may be a minimum of 3 1/2 " from the  
front flange of the wall sleeve. The minimum clearance  
should provide adequate clearance for the subbase, see  
Figures 46 and 47.  
The leveling legs must be installed before the chassis is  
installed, but after the wall sleeve is in place.  
Holes must be drilled in each side of the wall sleeve, below  
the duct package holes, for attachment to the wall sleeve.  
Receiving  
• Compare kit identification number with sales order to ensure  
that the correct kit has been received.  
• Inspect the leveling legs for shipping damage. File damage  
claims with the delivering carrier immediately.  
2. Cut out the template in the lower right hand corner of these  
instructions to locate the field drilled holes. (Two to mount  
the plate and one for the Outdoor drain fitting). See Detail  
A on how the components have to be installed after the  
holes are drilled in the bottom of the wall sleeve. If the  
drain fitting is not connected to an indoor drainage system  
immediately after the wall sleeve is installed, it must be  
plugged with a cork to prevent indoor water damage in  
case it rains.  
Installation  
The installation and servicing of this equipment should be  
performed by qualified, experienced technicians.  
WARNING  
An indoor tube or hose (furnished by others) must be installed  
on the drain fitting and interconnected to the drain system  
inside of the building.  
Hazardous Voltage!  
Disconnect all electric power, including remote disconnects  
before servicing. Follow proper lockout/tagout procedures  
to ensure the power can not be inadvertently energized.  
Failure to disconnect power before servicing could result in  
death or serious injury.  
Install the two blank-off plates C and gaskets A on the  
outdoor portion of the wall sleeve as shown in Figure 46.  
These components may be installed after the sleeve is  
secured in the wall opening just prior to the installation of the  
condenser grille and chassis.  
Important Note:  
The unit OFF switch does not disconnect all electrical power  
to this unit.  
Figure 47  
Checklist  
The following is an abbreviated guide to leveling leg  
installation. Refer to appropriate areas for more detailed  
information.  
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Leveling Leg Assembly  
Installation on Wall Sleeve  
To install the leveling leg assembly, complete the following:  
1. Drill four 1/8-inch diameter holes in the wall sleeve, two on  
each side, using the leveling legs as a template. Caulk  
around screws to prevent water leaks.  
1. Drill two 1/8-inch holes in each side of the wall sleeve, as  
shown in Figure 48, using the leveling leg assembly as a  
template. Locations near the front of the sleeve provide  
more support.  
2. Attach the legs to the wall sleeve, using the screws  
provided.  
2. Adjust the leveling legs to the approximate height needed  
and install them on either side of the wall sleeve, using the  
screws provided. Bottom of wall sleeve can be anywhere  
from three to five inches above the screw base. Caulk  
around screws to prevent water leaks.  
3. Adjust the leveling legs to level the wall sleeve from side to  
side and provide a slight pitch to the outside (one-quarter  
bubble in sight glass).  
Figure 49 - Leveling Leg Installation on Wall Sleeve  
3. Level the sleeve horizontally from side-to-side. Provide a  
slight slope (one-quarter bubble in the sight glass) toward  
the outside. Check the level again after the unit has been  
installed. Adjust the legs as needed.  
Figure 48 - Leveling Leg Assembly  
1/8" Diameter holes  
(four required per unit field-drilled)  
Leveler Bracket  
1/2"  
Speed Grip Nut  
1"  
Adjuster Screw  
1/4"  
NOTES:  
1. Two leveling legs are supplied in each kit.  
2. One kit is required per unit.  
3. Four mounting screws are provided in each kit.  
- 32 -  
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Hard Wire Kit  
Part No: AYAGALA01  
WARNING  
Hazardous Voltage!  
Disconnect all electric power, including remote disconnects  
before servicing. Follow proper lockout/tagout procedures to  
ensure the power can not be inadvertently energized. Failure  
to disconnect power before servicing could result in death or  
serious injury.  
Description  
Important Note:  
The unit OFF switch does not disconnect all electrical power  
to this unit.  
Hard Wire Junction Box (Direct Wire Sub-Base) The hard wire  
junction box kit is used to hard wire the unit when it is not  
desirable to use the standard unit subbase or the unit power  
cord.  
The junction box provides a protected enclosure for electrical  
connections as required by some electrical codes.  
The hard wire junction box is intended to be mounted on the  
floor or the adjacent wall.  
CAUTION  
Use Copper Conductors Only!  
Unit terminals are not designed to accept other types of  
conductors. Failure to use copper conductors may result in  
equipment damage.  
Important Note:  
All wiring must comply with applicable  
The junction box is furnished with approximately 2-1/2 feet of  
1/2-inch flexible steel conduit and a metal box for securing the  
conduit to the unit cabinet at the incoming power opening.  
local and national codes. Types and location of disconnect  
switches must comply with all applicable codes.  
An optional 230/208V or 265V power switch assembly is  
available for use with the hard wire junction box or subbase.  
The switch provides a POWER ON/OFF function at the unit  
as required by some electrical codes.  
A replacement junction box cover plate is provided with each  
switch kit.  
1. Remove the cover plate from the junction box  
2. Mount the junction box to the wall or floor within 28 inches (711  
mm) of the lower right corner of the wall sleeve.  
3. If a disconnect switch is to be used, make electrical  
connections to it and mount the switch in the junction box.  
Refer to the Power Switch Installation Instructions.  
4. Remove control panel assembly by removing the two screws  
holding control panel in place. Rotate the panel forward.  
5. Disconnect the power cord leads from all electrical connections  
including the ground wire.  
6. Remove the power cord clamp and the power cord from the  
unit.  
7. For 208/230-volt units, remove and discard the white lead from  
the wire assembly. For 265-volt units, remove and discard the  
red lead from the wire assembly.  
For additional information, refer to the Power Switch  
Installation Instructions.  
Receiving  
Upon receipt of the product, inspect the shipping carton for  
signs of visible damage. Report any damage or shortage to  
the carrier and note it on the delivery receipt. Unit must be  
stored in its original shipping carton in a dry, secure place  
prior to its installation and use.  
8. Remove the retaining ring from the threaded portion of the  
straight conduit clamp. Insert the three wires into the metal box  
through one of the two openings in the box. Replace the hole  
cover grommet into the unused hole to prevent objects from  
entering the box.  
Installation  
The installation and servicing of this equipment should  
performed by qualified, experienced technicians.  
9. Replace the retaining ring back on the conduit clamp inside the  
metal box and tighten the ring securely.  
Junction Box Kit Installation and Wiring  
Procedure  
10. Insert the three wires extending from the metal box into the  
incoming power opening on the unit so that approximately 20  
inches (508 mm) of the wires protrude through the opening.  
11. Attach the metal box to the chassis with the two screws  
provided. See Figure 50.  
EIectrical connections at the unit must be made after the unit  
chassis is installed in the wall sleeve. The installer must  
determine and supply the mounting components for attaching  
the junction box to the wall or door.  
12. Insert the wire tie into the 1/4-inch diameter hole located just  
above the incoming power opening. Tie all wires together  
securely with the wire tie. See Figure 51.  
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208/230 Volt Units  
Figure 50 - Mounting Hard Wire Junction Box Kit  
1. Remove and discard the white lead from the wire  
assembly.  
Wall Sleeve  
2. Connect the black lead to the line 2 terminal on the control  
board.  
3. Connect the red lead to the common (C) terminal on the  
capacitor.  
Ground Wie  
with Eyelet  
Terminal  
4. Connect the ground wire to the partition panel where the  
ground wire on the power cord was located.  
Use the supplied green ground screw.  
Cover plate  
Power Leads  
with Push on  
Connectors  
28 Inch es Max  
5. Connect the red lead in the wire assembly at the junction  
box to the red lead of the field power source.  
Conduit  
Metal Box  
with Straight Clamp  
6. Connect the black lead in the wire assembly at the junction  
box to the black lead of the field power source.  
Figure 51 - Metal Box Location  
7. Connect the ground wire of the field power source to the  
ground wire of the wire assembly at the junction box.  
8. Install the junction box cover plate.  
9. Reinstall the control panel assembly.  
Control Panel  
265 Volt Units  
1. Remove and discard the red lead from the wire assembly .  
2. Connect the black lead to the center terminal of the fuse  
holder.  
Base Pan  
Bracket  
3. Connect the white lead to the common (C) terminal on the  
capacitor.  
Figure 52 - Electrical Wiring Routing  
4. Connect the ground wire to the partition panel where the  
ground wire on the power cord was located.  
Use the supplied green ground screw.  
5. Connect the white lead of the wire assembly at the junction  
box to the white lead of the field power source.  
Right Side of Chassis  
Wire Tie  
6. Connect the black lead of the wire assembly at the junction  
box to the black lead of the field power source.  
3/16 Inch  
Diamenter Hole  
7. Connect the ground wire of the field power supply to the  
bare ground wire of the wire assembly at the junction box.  
Electrical Supply Wires  
8. Install the junction box cover plate.  
9. Reinstall the control panel assembly.  
Back of Control Panel  
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Remote Escutcheon Kit  
Part No: AYRE110  
Description  
This kit provides an attractive replacement escutcheon (see  
Figure 53). The kit allows the removal of control knobs and  
graphics, which are not required when a wall thermostat is  
used to control the unit.  
Figure 54  
Receiving  
Upon receipt of the product, inspect the shipping carton for  
signs of visible damage. Report any damage or shortage to  
the carrier and note it on the delivery receipt. The unit must  
be stored in its original shipping carton in a dry, secure place  
prior to its installation and use.  
Installation  
The installation and servicing of the equipment referred to in  
this booklet should be performed by qualified, experienced  
technicians.  
1. Grasp the cabinet front as shown in Figure 54.  
2. Pull the bottom of the cabinet front away from the chassis  
until the retaining clips disengage as in  
Figure 55.  
WARNING  
3. Lift the cabinet front off the chassis.  
Hazardous Voltage!  
4. Lifting the front edge of the escutcheon, slide the tabs at  
the top of the escutcheon out of the retaining holes and  
remove the escutcheon. See Figure 56.  
Disconnect all electric power, including remote disconnects  
before servicing. Follow proper lockout/ tagout procedures to  
ensure the power can not be inadvertently energized. Failure  
to disconnect power before servicing could result in death or  
serious injury.  
Figure 55  
Important Note:  
The unit OFF switch does not disconnect all electrical power  
to this unit.  
Figure 53—Standard Escutcheon  
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5. Replace the escutcheon with the one from this kit by  
inserting the tabs at the top of the escutcheon into the  
retaining holes and laying the escutcheon flat on the  
control panel.  
Installation  
The installation and servicing of the equipment referred to in  
this booklet should be performed by qualified, experienced  
technicians.  
6. Replace the front by reversing steps 1 through 4.  
7. Store the control knobs and escutcheon just removed from  
the unit for possible reinstallation if the wall thermostat is  
no longer desired.  
WARNING  
Hazardous Voltage!  
Disconnect all electric power, including remote disconnects  
before servicing. Follow proper lockout/ tagout procedures to  
ensure the power can not be inadvertently energized. Failure  
to disconnect power before servicing could result in death or  
serious injury.  
Figure 56  
Escutcheon  
Important Note:  
The unit OFF switch does not disconnect all electrical power  
to this unit.  
CAUTION  
Use Copper Conductors Only!  
Unit terminals are not designed to accept other types of  
conductors. Failure to use copper conductors may result in  
equipment damage.  
Subbase  
Part No: AYSB1101 (230/208V 20A)  
Note:  
AYSB2101 (230/208V 30A)  
When using a subbase, the wall sleeve must be installed a  
minimum of 3-1/4 inches (83 mm) above a finished floor and a  
minimum of 2-3/4 inches (70 mm) from a finished wall.  
1. Remove parts B and C (Figure 58, next page) from the  
subbase and join together using two metal screws provided.  
This assembly now becomes the right front cover (Part F) of  
the subbase. (Figure 57, next page)  
2. Position subbase under the front of the wall sleeve.  
Description  
3. Align the back edge of the flange on cover A (Figure 58, next  
page) to front of the wall sleeve flange. (Figure 59, next  
page)  
The subbase may be installed on the wall sleeve before or  
after installing the wall sleeve. The subbase is prewired.  
Electrical connections can be made on the left side after the  
access cover is removed. A grounding screw is provided.  
4. Drill four 1/8 inch holes in wall sleeve to line up with holes in  
subbase. (Figure 58, Location D, next page) Mount subbase  
to wall sleeve with four sheet metal screws provided with kit.  
(Figure 58, Location D, next page)  
Receiving  
5. Remove the left front cover from the subbase. (Figure 58,  
Part A, next page)  
Upon receipt of the product, inspect the shipping carton for  
signs of visible damage. Report any damage or shortage to  
the carrier and note it on the delivery receipt. The unit must  
be stored in its original shipping carton in a dry, secure place  
prior to its installation and use.  
6. Position skirting on each side of wall sleeve to prevent the  
entry of foreign materials. Trim skirting to desired length.  
Attach skirting with four sheet metal screws provided with kit.  
(Figure 58, Location E, next page)  
7. Wire subbase for appropriate voltage (Figure 60, next page).  
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Note:  
Figure 59 - Dimensions  
The proper subbase must be ordered to obtain the correct  
electrical receptacle. (Figure 61)  
13 3/4"  
8. After wiring is complete, mount covers A and F to the  
subbase with provided screws. (Figure 58)  
Wall Sleeve  
(Outdoor Side)  
2 3/4"  
16"  
16"  
Wall Sleeve  
Inside Edge  
Back of  
9. When installing optional accessories to the subbase, refer  
to each installation instruction for that accessory.  
2 3/4"  
Flange "A"  
2 5/8"  
Figure 57  
Left End View  
Concentric  
Knockouts In Bottom  
Top View  
Ground  
Screw Location  
Receptacle Provided  
Inside subbase  
Accessory  
3-1/16"  
(78 mm)  
13-7/8" (352 mm)  
Figure 58 - Part/Location Identification  
Part/Location Identification  
20-5/16" (515.5 mm)  
A
B
C
D
E
F
Left Front Cover  
Concentric  
Knockouts In Rear  
Right Front Cover  
2" (50 mm) Max.  
Adjustment  
Front View  
Front Cord Panel  
Wall Sleeve Hole Location  
Skirting Hole Location  
Right Cover Assembly  
Figure 60 - Wiring Diagram  
Field Wiring  
Line Voltage  
NEMA 6-20R  
Receptacle  
NEMA 7-20R  
Receptacle  
Wall Sleeve  
Field Wiring  
Line Voltage  
NEMA 6-30R  
Receptacle  
NEMA 7-30R  
Receptacle  
230/208 VAC Field Schematic  
265 VAC Field Schematic  
D
Figure 61 - NEMA Plug Configurations  
E
Voltage  
Unit Plug  
Subbase Receptacle  
2-13/16"  
(71 mm)  
Cover  
Wiring  
Access  
D
A
B
F
Subbase  
Box Assembly  
E
C
Low Voltage  
Compartment  
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5. Troubleshooting Guide  
5.1 OUTSIDE DIMENSIONS  
1,066mm (42")  
505mm (20")  
5.2 PIPING SYSTEM  
Following is a brief description of the important components and their functions in the refrigeration system.  
Refer to Figure 62 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle.  
ROOM AIR CONDITIONER  
CYCLE OF REFRIGERATION  
EVAPORATOR COILS  
CONDENSER COILS  
VAPOR INLET  
SUCTION LIME  
COOL LOW PRESSURE VAPOR  
HOT  
DISCHARGED  
AIR  
COMPLETE LIQUID  
BOIL OFF POINT  
COOLED  
AIR  
ROOM AIR HEAT LOAD  
OUTSIDE COOLING  
AIR FOR REFRIGERANT  
PASS THROUGH  
MOTOR  
COMPRESSOR  
OIL  
LIQUID  
PRESSURE  
DROP  
LIQUID OUTLET  
HIGH PRESSURE VAPOR  
(LIQUID REFRIGERANT)  
LIQUID PEFRIGERANT  
CAPILLARY TUBE  
LOW PRESSURE VAPOR  
Figure 62  
- 38 -  
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5.3 TROUBLESHOOTING GUIDE  
In general, possible trouble is classified in two causes.  
The one is Starting Failure which is caused from an electrical defect, and the other is Ineffective Air Conditioning  
caused by a defect in the refrigeration circuit and improper application.  
Unit is running but cooling is ineffective  
Ineffective Cooling  
Check of cold air circulation  
for smooth flow.  
Check of outdoor coil  
(heat exchanger) & the fan  
operation.  
Check heat load increase.  
Unexpected residue  
Overloaded Circuit  
Dirty indoor coil  
(Heat exchanger)  
Check gas leakage.  
Repair gas leak.  
Malfunction of fan  
Check of inside gas  
pressure.  
Clogged of air filter  
Obstruction at air outlet  
Replacement of unit if the  
unit is beyond repair.  
Adjusting of refrigerant  
charge  
Correct above trouble  
Malfunction of compressor  
Replacement of  
compressor  
Check clogging in  
refrigeration circuit.  
Satisfactory operation with  
temperature difference of  
inlet & outlet air 44.6~50˚ F  
(7~10˚ C)  
Repair clogging in  
refrigeration circuit.  
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Fails to Start  
Check power source.  
Check circuit breaker  
and fuse.  
Check control switch  
setting.  
Gas leakage of feeler bulb  
of thermostat  
Check control switch.  
Only compressor fails to  
start.  
Only fan fails to start.  
Improper wiring.  
Drop of power voltage.  
Improper thermostat setting  
Defect of fan motor  
capacitor.  
Defect of compressor  
capacitor.  
Loose terminal connection.  
Improper wiring  
Irregular motor resistance  
(
).  
Irregular motor insulation  
).  
Check capacitor.  
Replacement.  
(
Replacement of fan motor  
Regular but fails to start  
Irregular motor resistance ( )  
Irregular motor insulation ( )  
Replacement of compressor  
(locking of rotor, metal)  
Replacement of compressor  
(Motor damaged)  
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COMPLAINT  
CAUSE  
REMEDY  
Fan motor will not run.  
No power  
Check voltage at outlet. Correct if none.  
Power supply cord  
Rotary switch  
Check voltage to rotary switch. If none, check  
power supply cord. Replace cord if circuit is open.  
Check switch continuity. Refer to wiring diagram  
for terminal identification. Replace switch if  
defective.  
Wire disconnected or  
connection loose  
Connect wire. Refer to wiring diagram for terminal  
identification. Repair or replace loose terminal.  
Capacitor (Discharge  
Test capacitor.  
capacitor before testing.)  
Replace if not within 10% of manufacturer's  
rating. Replace if shorted, open, or damaged.  
Will not rotate  
Fan blade hitting shroud or cross flow fan hitting  
scroll. Realign assembly.  
Units using slinger ring condenser fans must  
have 1/4 to 5/16 inch clearance to the base. If it is  
hitting the base, shim up the bottom of the fan  
motor with mounting screw(s).  
Check fan motor bearings; if motor shaft will not  
rotate, replace the motor.  
Fan motor runs  
intermittently  
Revolves on overload.  
Check voltage. See limits on this page. If not within  
limits, call an electrician.  
Test capacitor.  
Check bearings. Does the fan blade rotate freely?  
If not, replace fan motor.  
Pay attention to any change from high speed to  
low speed. If the speed does not change, replace  
the motor.  
Fan motor noise.  
Grommets  
Fan  
Check grommets; if worn or missing, replace them.  
If cracked, out of balance, or partially missing,  
replace it.  
Turbo fan  
If cracked, out of balance, or partially missing,  
replace it.  
Loose set screw  
Worn bearings  
Tighten it.  
If knocking sounds continue when running or  
loose, replace the motor. If the motor hums or  
noise appears to be internal while running,  
replace motor.  
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COMPLAINT  
CAUSE  
REMEDY  
Compressor will not run,  
but fan motor runs.  
Voltage  
Wiring  
Check voltage. See the limits on the preceding.  
page. If not within limits, call an electrician.  
Check the wire connections, if loose, repair or  
replace the terminal. If wires are off, refer to wiring  
diagram for identification, and replace. Check wire  
locations. If not per wiring diagram, correct.  
Rotary  
Check for continuity, refer to the wiring diagram  
for terminal identification. Replace the switch if  
circuit is open.  
Thermistor  
Check the position of knob If not at the coldest  
setting, advance the knob to this setting and  
restart unit.  
Check continuity of the thermistor. Replace  
thermistor if circuit is open.  
Capacitor (Discharge  
capacitor before  
servicing.)  
Check the capacitor.  
Replace if not within 10% of manufacturers  
rating. Replace if shorted, open, or damaged.  
Check the compressor for open circuit or  
ground. If open or grounded, replace the  
compressor.  
Compressor  
Overload  
Check the compressor overload, if externally  
mounted. Replace if open. (If the compressor  
temperature is high, remove the overload, cool it,  
and retest.)  
ROOM AIR CONDITIONER VOLTAGE LIMITS  
NAME PLATE RATING  
MINIMUM  
MAXIMUM  
208/230V  
187V  
253V  
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REMEDY  
COMPLAINT  
CAUSE  
Compressor cycles  
on overload.  
Voltage  
Check the voltage. See the limits on the preced-  
ing page. If not within limits, call an electrician.  
Overload  
Check overload, if externally mounted.  
Replace if open. (If the compressor temperature  
is high, remove the overload, cool, and retest.)  
Fan motor  
If not running, determine the cause. Replace if  
required.  
Condenser air flow  
restriction  
Remove the cabinet. inspect the interior surface  
of the condenser; if restricted, clean carefully  
with a vacuum cleaner (do not damage fins) or  
brush. Clean the interior base before  
reassembling.  
Condenser fins  
(damaged)  
If condenser fins are closed over a large area  
on the coil surface, head pressures will increase,  
causing the compressor to cycle. Straighten the  
fins or replace the coil.  
Capacitor  
Test capacitor.  
Wiring  
Refrigerating system  
Air filter  
Check the terminals. If loose, repair or replace.  
Check the system for restriction.  
If restricted, clean of replace.  
Insufficient cooling or  
heating  
Exhaust damper door  
Unit undersized  
Close if open.  
Determine if the unit is properly sized for the area to  
be cooled.  
Excessive noise.  
Cross flow fan  
Copper tubing  
Check the set screw or clamp. If loose or missing,  
correct. If the blower or fan is hitting air guide,  
rearrange the air handling parts.  
Carefully rearrange tubing not to contact,  
compressor, shroud, and barrier.  
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6. Piping Diagrams  
CAPILLARY TUBE  
Th2  
Th1  
HEAT  
HEAT  
EXCHANGER  
(EVAPORATOR)  
EXCHANGER  
(CONDENSER)  
COMPRESSOR  
LOC.  
Description  
PCB Connector  
CN-IDAT  
Th1  
Th2  
Thermistor for indoor Air temperature  
Thermistor for Evaporator pipe temperature  
CN-IDPT  
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7. Schematic Diagram  
In part "A", there are 3 types.  
Type.1  
BK  
BK  
BL  
OUTDOOR  
FAN  
MOTOR  
RD  
OR(BR)  
YL  
YL  
1
2
3
4
OR(BR)  
YL  
Type.2  
BK  
BL  
RD  
OR(BR)  
YL  
BL  
OUTDOOR  
FAN  
MOTOR  
OR(BR)  
YL  
OR  
OR  
YL  
RD  
Type.3  
BK  
BL  
RD  
OR(BR)  
YL  
OUTDOOR  
FAN  
MOTOR  
RD  
OR(BR)  
YL  
In part "B", there are 3 types.  
Type.1  
BK  
BL  
RD  
OR  
BR  
YL  
BL  
INDOOR  
FAN  
MOTOR  
RD  
OR  
BR  
YL  
GN/YL  
Type.3  
Type.2  
BK  
BL  
RD  
OR  
BR  
YL  
BK  
BL  
BK  
BL  
RD  
OR  
BR  
YL  
BK  
INDOOR  
FAN  
MOTOR  
INDOOR  
FAN  
MOTOR  
RD  
OR  
BR  
YL  
OR  
BR  
YL  
GN/YL  
GN/YL  
CN-COMP  
CN-N(L)  
CN-TRANS CN-EXT  
CN-IAT  
CN-ICT  
CN-N(N)  
CN-EXT(N)  
CN-EXT(L)  
CN-IDF  
CN-ICR  
CN-ODF  
RY-HEAT2 RY-HEAT1  
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8. Exploded View  
552114  
35211A  
552113  
C
352115B  
352390  
352116  
352115  
152302A  
135500B  
148000  
342800  
D
435300A  
149400  
349600A  
346810  
435300B  
554030  
359011  
337000  
135515  
546810  
349600B  
F
354210  
559011  
549990  
W50400  
263230B  
130411  
135500A  
263230A  
753010  
249951  
135312  
330870  
149410  
E
152302B  
435301  
A
B
268711B  
W0CZZB  
238310  
135511  
135800  
567502  
554160  
237200  
249941A  
264110  
261702  
W6640  
135301  
550140  
249941B  
W0CZZA  
147901  
263230A Thermistor for Indoor Air Temperature  
263230B Thermistor for Evaporator Pipe Temperature  
Housing color : blue  
Housing color : white  
* Please ensure GCSC since the replacement parts may be changed depending upon the buyer's request.  
Please check the correct parts in View RPL(Replacement Part List) on GCSC.  
(GCSC Website http://biz.lgservice.com)  
Note)  
- 46 -  
Copyright ©2008 LG Electronics. Inc. All right reserved.  
Only for training and service purposes  
LGE Internal Use Only  
Download from Www.Somanuals.com. All Manuals Search And Download.  
CONDENSER (OUTDOOR) SERVICE REPLACEMENT PROCEDURE:  
In this Model Aluminum Condenser is applied.  
In case you need to replace the condenser follow the below mentioned steps:  
1. Cover the brazing point (Section A) between copper pipe and aluminum pipe with wet towel.  
2. Remove the copper pipe and copper connector of aluminum condenser(Section B) by brazing and replace the  
condenser with a new one.  
3. Make sure that the direction of brazing flame is away from the aluminum condenser.  
(Follow the above procedure for assembling or disassembling the aluminum condenser)  
Copper pipe  
Aluminum pipe  
Cover the brazing point  
with wet towel  
Brazing point in  
assembling or  
disassembling  
Section "A"  
Section "B"  
Enlarged picture  
- 47 -  
Copyright ©2008 LG Electronics. Inc. All right reserved.  
Only for training and service purposes  
LGE Internal Use Only  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FEBRUARY, 2008  
P/NO : MFL42137114  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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