LG
LG Room
Air Conditioner
SERVICE MANUAL
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
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1.1 SPECIFICATIONS
Cooling / Electric Heater
Electric Heat
(Btu/h)
Electric Heat
Amps(A)
Min Circuit
Model Name
Cooling(Btu/h)
Cooling Watts(W)
1055/1025
EER
Protection (Amps)
LP120CEM
11800/11500
11.2/11.2
-
-
20
Cooling / Heat Pump / Electric
Cooling
Model Name Cooling(Btu/h)
Watts(W)
Electric Cycle
Heat (Btu/h)
Electric Heat Electric Heat
Min Circuit
EER
COP
(Btu/h)
Amps(A)
3.2/3.5
4.4/4.8
Protection (Amps)
LP090HEM
9300/9000
800/775
11.6/11.6
11.1/11.1
8200/8000
3.4/3.4
3.3/3.3
11900/9900
11900/9900
20
20
LP120HEM 12100/11800
1090/1065
10900/10700
LP 12 0 C M 2
12 34 5 6 7 8
Digits 1,2 - LG Packaged Terminal Air Conditioner
Digits 3,4 - Unit Cooling Capacity
07 = 7,000 Btu/h
Digit 6 - Product Type
C = Air Conditoner
H = Heat Pump
09 = 9,000 Btu/h
Digit 7- Control Type
12 = 12,000 Btu/h
M = Mechanical Control
15 = 15,000 Btu/h
Digit 5 - Serial No.
Digit 8 - Electric Heating Capacity
2 = 2.0 kW
3 = 3.5 kW
5 = 5.0 kW
—3—
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1.2 features
Unit Features
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.
• Highly featured Micom controls using IIR (infinite impulse response)
IIR function can make Micom controls maximize and keep the comfort conditions to sense the small changes in temperature
per second.
• 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 unit provides the function of selecting the either High or Low speed for Fan-Only operation.
• Indoor Fan Speed Selections - High/Low
The unit is operated in High-Heat or Low-Heat or High Cool or Low Cool.
• Two Fan motors
The unit has two fan motors to provide the occupants with the quiet environment to enjoy the peaceful life and maximum
operating 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 the compressor failure.
• Indoor Filters
The unit uses the two indoor filters easily slide in and out. The filters may be cleaned by washing and brushing without
removing the front grille.
• Rotary Compressor
The unit uses the rotary compressor for the quiet, reliable operation and prolong life.
• 2 Position Discharge Grille
The discharge grille can provide air flows upward at an angle of 40 off vertical or 80 15 degree off vertical. An angle is
changed by removing the front grille and 4screws that fasten the discharge grille to the front grille to rotate an alternate
position of the louvers.
• Indoor Room Freeze Protection
When the unit senses the room temperature falls to 40˚F below, 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 on below 120˚F.
—4—
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• Outdoor Air Temperature Switchover
The unit is designed to control the electric heater interfacing with the outdoor temperature. When the outdoor temperature falls
to 20˚F below, it makes the compressor be off and the electric heater be turned on until the outdoor temperature is above
25˚F. 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 for reducing the energy costs.
• Condensate Drain Valve
The unit has the condensate drain valve that prevents water from freezing in 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 - (PTHDs 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.
—5—
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1.3 CONTROL LOCATIONS
• OPERATION
ELECTRIC HEATING MODEL
COOLING ONLY MODEL
TEMPERATURE CONTROL
OPERATION MODE SELECTOR
OFF: Turns air conditioner off.
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.
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.
• 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
The damper is opened and outdoor air is drawn into the room.
This will reduce the cooling or heating efficiency.
VENT
OPEN
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.
—6—
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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.
Cooling Operation
Heating Operation
Temperature Temperature Temperature
Limit #1
OFF
ON
Limit #2
OFF
OFF
ON
Limit #3
OFF
OFF
OFF
OFF
ON
Lowest Temp.
Highest Temp.
86°F (30.0°C)
Lowest Temp.
Highest Temp.
86°F (30.0°C)
54°F (12.2°C)
56°F (13.3°C)
58°F (14.4°C)
60°F (15.5°C)
62°F (16.6°C)
64°F (17.7°C)
66°F (18.9°C)
68°F (20.0°C)
54°F (12.2°C)
54°F (12.2°C)
54°F (12.2°C)
54°F (12.2°C)
54°F (12.2°C)
54°F (12.2°C)
54°F (12.2°C)
54°F (12.2°C)
86°F (30.0°C)
86°F (30.0°C)
86°F (30.0°C)
86°F (30.0°C)
86°F (30.0°C)
86°F (30.0°C)
86°F (30.0°C)
84°F (28.9°C)
82°F (27.8°C)
80°F (26.7°C)
78°F (25.5°C)
76°F (24.4°C)
74°F (23.3°C)
72°F (22.2°C)
OFF
ON
ON
OFF
ON
OFF
OFF
ON
ON
OFF
ON
ON
ON
ON
—7—
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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)
900ft(270m)
1500ft(450m)
2000ft(610m)
Note: The following figures show wiring
schematics for heat pump and straight cool
units with electric heat, respectively.
#20
#18
#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
—8—
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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 Fig. 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
factory with the discharge grille louvers at an angle
of 40˚ off vertical. In an alternate position the louvers
will be at an angle of 15˚ off vertical.
40˚
15˚
To adjust air direction, remove the front grille.
Remove the 4 screws that fasten the discharge grille
to the front grille.
Screws
Flip the discharge grille 180°, then reattach the
discharge grille to the front grille with 4 screws.
—9—
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2.1.2 CONTROL BOX (Half-Disassembly)
1. Remove the front grille. (Refer to section 2.1.1)
2. Remove the three screw which fasten the control
box. (See Fig. 2)
3. Pull the control box from the barrier. (See Fig.2)
4. Discharge the capacitor by placing a 20,000 ohm
resistor across the capacitor terminals.
5. Disconnect three wire housings in the control box.
6. Pull the control box forward completely.
7. Re-install the components by referring to the
removal procedure. (See Fig. 2)
(Refer to the circuit diagram found on page 25 in
this manual and on the control box.)
Figure 2
2.1.3 CONTROL BOX (Full-Disassembly)
1. Remove the front grille. (Refer to section 2.1.1)
2. Remove the 4 screws which fasten the control box
cover. (See Fig.3)
3. Disconnect three wire housings in the control box.
4. Remove three screws which fasten the control box
assembly.
5. Pull the control box assembly out from the unit.
Figure 3
—10—
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2.2 AIR HANDLING PARTS
2.2.1 HEATER ASSEMBLY AND CROSS
FLOW FAN
1. Remove the front grille. (Refer to section 2.1.1)
2. Remove the control box assembly.
(Refer to section 2.1.3)
3. Remove the 3 screws which fasten the net steel.
(See Fig. 4)
4. Remove the 3 screws which fasten the electric
heater assembly. (Electric heater model only)
(See Fig.4).
Figure 4
5. Loosen the hexagon screw with the Hex-wrench
(See Fig.5)
Figure 5
6. Remove the 4 screws which fasten the indoor
motor and the earth wire. (See Fig. 5. 6)
7. Re-install the components by referring to the
removal procedure, above.
2.2.2 FAN
1. Remove the brace.
Figure 6
2. Remove the 4 screws which fasten the condenser
with the shroud and the basepan.
3. Move the condenser sideways carefully.
4. Remove the clamp which secures the fan with
pliers.
5. Remove the fan. (See Fig. 7)
6. Re-install the components by referring to the
removal procedure, above.
Figure 7
—11—
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2.2.3 SHROUD
1. Remove the fan. (Refer to section 2.2.2)
2. Remove the screw which fastens the shroud.
3. Remove the shroud. (See Fig. 8)
4. Re-install the component by referring to the
removal procedure, above.
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 fan. (Refer to section 2.2.2)
3. Remove the 2 screws which fasten the motor.
(See Fig. 9)
Figure 8
4. Remove the motor.
5. Re-install the components by referring to the
removal procedure, above.
2.3.2 INDOOR MOTOR (Refer to section 2.2.1)
2.3.3 COMPRESSOR
1. Discharge the refrigerant system using FreonTM
Recovery System.
Figure 9
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before venting
the FreonTM . 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 Fig. 10)
5. Remove the compressor.
6. Re-instill the components by referring to the
removal procedure, above.
Figure 10
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 Fig. 11)
3. Remove 1 screw and the clamp which fastens the
can-type capacitor. (See Fig. 11)
4. Disconnect all the leads of capacitor terminals.
5. Re-install the components by referring to the
removal procedure, above.
Figure 11
—12—
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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 Fig. 12)
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 the special cord.
(The special cord means the cord which has the
same specification marked on the supply cord
fitted to the unit.)
Figure 12
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 13
—13—
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2.4 REFRIGERATION CYCLE
CAUTION
TM
Discharge the refrigerant system using Freon
Recovery System.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before
TM
venting the Freon . 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 14
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 Fig. 14)
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 15
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 Fig. 15)
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.
—14—
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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 FreonTM
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 Fig. 16B.
With valve C open, discharge the hose at the
manifold connection.
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.
5) With the unit running, open valve B and add the
balance of the charge.
a. Do not add the liquid refrigerant to the Low-
side.
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.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before venting
the FreonTM. 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.
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.
1) Connect the vacuum pump, as illustrated Fig.
16A.
2) Start the vacuum pump, slowly open manifold
valves A and B with two full turns
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.
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 is obtained. Close
valves A and B, and observe 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 Fig. 16B.
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 16A-Pulling Vacuum
Figure 16B-Charging
—16—
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Dimension of air conditioner
3. INSTALLATION
3.1 HOW TO INSTALL THE UNIT
1,066mm(42")
CAUTION
• There are sharp edges that can cause serious cuts.
• When lifting the air conditioner, it is HEAVY.
Use 2 peoples to lift.
406mm
(16")
For existing sleeve, you should measure the wall sleeve
dimensions.
You can 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 the rear grille that securely
attaches to the sleeve or the flange of the sleeve to secure the
new air conditioner.
318mm
(12 1/2")
505mm
(20")
Dimension of sleeve assembly (optional)
• To avoid vibration and noise, make sure the unit is installed
securely and firmly.
1066mm
(42")
406mm
(16")
318mm
(12 1/2")
A. BEFORE ATTACHING THE FRONT
GRILLE TO THE SLEEVE, IF YOU WANT
TO PULL OUT THE FILTER UPWARD;
1. There should be no obstacle, like a fence, within 20" which
might restrict heat radiation from the condenser.
INSULATION
SLEEVE
WALL
WALL
COOLED
HEAT
RADIATION
AIR
INTAKE
AIR
1/4" Bubble
of the level
B. IF YOU WANT TO PULL OUT THE FILTER
DOWNWARD;
Over 20"
The grille is already designed for that way.
1. Install the unit a little obliquely outward not to leak the
condensed water into the room (about 1/2" or 1/4" bubble
with level).
1/4" Bubble
2. Install the unit with its bottom portion 30~60" above the floor
level.
3. The power cord must be connected to an independent
circuit. The green wire must be grounded.
Level
—17—
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3.2 SUGGESTED TOOL REQUIREMENTS
SCREWDRIVER(+, -), RULER, KNIFE, HAMMER, PENCIL, LEVEL
3.2.1 PREPARATION OF SLEEVE
12
14
SLEEVE HARDWARE
R
NUMBER
NAME OF PARTS
SLEEVE LOWER
SLEEVE UPPER
SCREW
Q’TY
1
1
1
4
1
1
OUTDOOR GRILLE
DRAIN KIT
ASSEMBLE THE WALL SLEEVE
• Raise the sleeve side panels to upright position as shown on
the right.
R
O
O
D
N
I
• Place sleeve upper on top of side panels.
• Fasten the four screws as shown on the right.
INDOOR
R
O
O
D
I N
• Assemble drain kit.
• Fasten this assembly to the each side of the wall sleeve as
shown on the right.
I
N
D
O
O
R
• Assemble the outdoor grille and fasten the 4 screws as
shown on the right.
R
O
O
D
N
I
3.2.2 PREPARATION OF THE FRONT GRILLE
Carefully remove shipping tape, if there is any, from the front
grille.
Shipping tape
—18—
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3.2.3 UNIT INSTALLATION
1. Remove the shipping screw from the ventilation door.
(See Fig. 17)
Figure 17
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 Fig. 18)
Figure 18
3. Slide the unit into the wall sleeve and secure with 6 screws
through the unit flange holes. (See Fig. 19)
Figure 19
4. Reinstall the front grille by hooking the top over the unit top,
then pushing it in at the bottom. (See Fig. 20)
Figure 20
—19—
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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.
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
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.
—20—
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4. PERFORMANCE DATA
Air Conditioner Performance Data
LP120CEM
Voltage (V)
208 230
208
230
Cooling Data
Cooling Capacity
(Btu/h)
11,500
4.8
11,800
Cooling Amps (A)
Cooling Power (W)
EER (Btuh/Watt)
5.2
1055
11.0
1025
11.0
Moisture Removal
(Pts/h)
3.3
3.3
Airflow
Indoor CFM (Wet)
@0.3ESP (Hi)
300
290
320
280
330
290
350
310
Indoor CFM (Wet)
@0.3ESP (Lo)
Indoor CFM (Dry)
@0.3ESP (Hi)
Indoor CFM (Dry)
@0.3ESP (Lo)
Heat Pump Performance Data
LP120HEM
208 230
LP090HEM
208
Voltage (V)
208 230
230
Cooling Data
Cooling Capacity (Btu/h)
Cooling Amps (A)
Cooling Power (W)
EER (Btuh/Watt)
Moisture Removal (Pts/h)
Heat Pump Heating Data
Heating Capacity (Btu/h)
Heating Amps (A)
Heating Power (W)
COP (W/W)
11,800
5.4
12,100
5.0
9,000
3.9
9,300
3.7
1,065
11.1
3.3
1,090
11.1
3.3
775
11.6
3.4
800
11.6
3.4
10,700
4.8
10,900
4.4
8,000
3.5
8,200
3.2
950
970
690
3.4
705
3.4
3.3
3.3
Airflow
Indoor CFM (Wet)
@0.3ESP (Hi)
240
190
260
270
230
290
310
270
330
340
300
360
Indoor CFM (Wet)
@0.3ESP (Lo)
Indoor CFM (Dry)
@0.3ESP (Hi)
Indoor CFM (Dry)
@0.3ESP (Lo)
220
250
290
330
—21—
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Cooling Wattage - Air Conditioners
Model
LP120CEM
Temperature
Outdoor
Air
Dry Bulb
Return Air
Wet Bulb
Total Wattage
Input
Min
Max
Rating Wattage
1045
1090
85
80
75
70
65
60
55
85
80
75
70
65
60
55
85
80
75
70
65
60
55
85
80
75
70
65
60
55
85
80
75
70
65
60
55
1050
1055
1060
1055
1050
1045
1030
1000
1005
1005
1005
1000
990
980
950
950
955
950
950
940
930
895
900
905
900
895
890
880
850
850
850
850
850
940
830
1180
1180
1180
1180
1180
1175
1160
1125
1130
1135
1130
1125
1120
1105
1070
1075
1080
1075
1070
1060
1055
1020
1020
1030
1020
1020
1010
1000
970
100
95
90
85
80
970
975
970
970
960
950
—22—
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Cooling Wattage - Heat Pumps
Model
LP090HM*
LP120HEM
Temperature
Outdoor
Air
Return Air
Total Wattage
Input
Total Wattage
Input
Dry Bulb Wet Bulb
Min
Max
Min
Max
Rating Wattage
810
850
1120
1145
85
80
75
830
835
835
835
830
820
810
785
790
795
790
785
780
770
745
750
750
750
745
735
720
700
705
705
705
700
690
680
655
660
660
660
655
650
635
935
940
940
940
935
925
915
890
890
890
890
890
880
865
845
850
850
850
845
835
825
800
800
810
800
800
790
775
755
760
760
760
755
745
735
1120
1125
1130
1125
1120
1115
1100
1070
1075
1075
1075
1070
1060
1050
1020
1025
1025
1025
1020
1010
1000
970
975
975
975
970
960
950
920
925
925
920
920
910
1230
1235
1240
1240
1230
1230
1210
1180
1190
1190
1190
1180
1170
1160
1130
1135
1135
1125
1130
1120
1110
1080
1085
1085
1085
1080
1070
1060
1030
1030
1035
1030
1030
1020
1010
100
70
65
60
55
85
80
75
70
65
60
55
85
80
75
70
65
60
55
85
80
75
70
65
60
55
85
80
75
70
65
60
55
95
90
85
80
900
—23—
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Cooling change of temperature - Air Conditioners
Room Air Room Air
LP120CEM
Dry
Bulb
Wet
Bulb
Temperature Across
Indoor Coil (∆ T)
Min
Max
Rating Btu/h
Rating CFM
11700
300
12000
330
85
80
75
70
80
75
70
65
75
70
65
60
70
65
60
55
65
60
55
1
9
5
13
22
30
10
18
25
33
13
20
26
33
15
20
25
30
13
17
21
90
85
80
18
26
5
13
21
29
9
15
23
29
10
15
21
26
9
75
70
13
18
Cooling Change of Temperature - Heat Pumps
Model
Room Air Room Air
LP090HEM
LP120HEM
Dry
Bulb
Wet
Bulb
Temperature Across
Indoor Coil (∆ T)
Temperature Across
Indoor Coil (∆ T)
Min
Max
Min
Max
Rating Btu/h
Rating CFM
9300
240
9600
270
12300
310
12600
340
85
80
75
70
80
75
70
65
75
70
65
60
70
65
60
55
65
60
55
2
6
1
5
11
19
29
7
15
22
30
11
18
25
33
15
20
27
33
16
21
26
31
15
18
22
10
18
26
5
13
22
30
10
18
25
33
13
20
26
33
15
20
25
30
13
17
21
90
85
80
15
23
31
11
18
24
32
13
18
23
29
12
16
20
14
21
30
10
16
23
30
11
16
21
26
10
14
18
75
70
—24—
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Heating Change of Temperature - Heat Pumps
Model
Room Air Room Air
LP090HEM
LP120HEM
Dry
Bulb
Wet
Bulb
Temperature Across
Indoor Coil (∆ T)
Temperature Across
Indoor Coil (∆ T)
Min
Max
Min
Max
Rating Btu/h
Rating CFM
8200
260
8400
290
10900
330
11200
360
85
80
75
70
65
85
80
75
70
65
85
80
75
70
65
85
80
75
70
65
24
25
26
28
28
22
23
24
24
25
20
21
22
23
24
17
18
19
20
21
27
28
29
30
30
24
25
26
27
28
22
23
24
24
25
20
21
22
23
24
27
28
29
31
31
24
25
26
27
28
23
23
24
25
26
21
22
23
23
24
30
31
32
34
34
29
29
30
31
32
27
28
29
29
30
24
25
26
27
28
50
45
40
35
Cooling Ampere Chart - Air Conditioners
Cond Inlet Air
Temperature
Model
LP120CEM
Amperage
Min Max
4.8 5.2
Rating Ampere
100
95
90
85
80
5.6 5.6
5.4 5.3
5.2 5.1
4.9 4.8
4.7 4.6
Cooling Ampere Chart - Heat Pumps
Cond Inlet Air
Temperature
Model
LP090HM*
Amperage
Min Max
3.6 3.9
3.4 4.0
3.2 3.8
3.1 3.6
3.1 3.4
2.9 3.3
Model
LP120HEM
Amperage
Min Max
4.8 5.2
5.6 5.5
5.3 5.2
5.0 5.0
4.8 4.7
4.6 4.5
Rating Ampere
100
95
90
85
80
—25—
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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 Fig. 21 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 21
—26—
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5.3 TROUBLESHOOTING GUIDE
In general, possible trouble is classified in two causes.
The one is called 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
Repair clogging in
refrigeration circuit.
—27—
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Fails to Start
Check of power source.
Check of circuit breaker
and fuse.
Check of control switch
setting.
Gas leakage of feeler bulb
of thermostat
Check of 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)
—28—
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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.
—29—
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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.
Thermostat
Check the position of knob If not at the coldest
setting, advance the knob to this setting and
restart unit.
Check continuity of the thermostat. Replace
thermostat 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
—30—
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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 a 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.
—31—
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6. SCHEMATIC DIAGRAM
POWER INPUT
WH(BL)
BK(BR)
(Ribbed)
(Plain)
HEATER ASSY
GN(GN/YL)
BI-METAL
THERMOSTAT
FUSE
LINK
HEATER
BK
BK
BK
BK
RD
BL
RD
BL
TB-1
TB-2
WH
WH
5KW
WH
TB-3
TB-4
RD
RD
BK
BK
FOR E/HEATER MODEL
BK
RD RD
OR(BR) OR(BR)
YL YL
OUTDOOR
FAN
MOTOR
3
3
CN-ODF
CN-ICR
4
4
RY-HEAT2
RY-HEAT1
F
LOW
FAN
VR1
CAPACITOR
HIGH
FAN
C
CN-4WAY
OFF
LOW
HEAT
LOW
COOL
H
BK BK
WARM
COOL
R
HIGH
HEAT
HIGH
COOL
SW1
RD RD
S
COMP
CN-IDF
BL BL
BR
C
IN
IN
COIL AIR
O.L.P
CN-EXT(L)
CN-EXT(N)
CN-L
CN-N
BK
INDOOR PIPE
THERMISTOR
BL BL
RD RD
OR OR
BR BR
YL YL
INDOOR AIR
THERMISTOR
INDOOR
FAN
RY-COMP
MOTOR
CN-COMP
CN-EXT2
CN-TRANS
CAPACITOR
GN(GN/YL)
C
F
REMOTE
THERMOSTAT
EXTERNAL
TRANS
FDC
P/NO:3854A20196A
LOCATION
NO.
Q'TY
PER SET
DESCRIPTION
REMARKS
1
2
1
1
1
1
1
1
1
1
POWER CORD
MOTOR
INDOOR
OUTDOOR
BOX TYPE
3
CAPACITOR
CAN TYPE
4
5
6
THERMOSTAT
COMPRESSOR
OVERLOAD PROTECTOR
—32—
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7. EXPLODED VIEW
C
552111
552102
552114
552113
35211A
152302
349600
346810
D
148000
554030
359011
546811
135515
349600-1
F
W48602
559011
354210
149980
130411
135500
753000
135312
E
152302
A
B
238310
268714 237200
149410
249951
135510
237204
567502
554160
W0CZZ-1
237200
263230-2
264110
263230-1
W6640
W0CZZ-2
550140
147900
—33—
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8. REPLACEMENT PARTS LIST
PART NO.
LP120CEM
LOCATION
DESCRIPTION
REMARK
NO
.
LP090HEM
LP120HEM
A
249951 CONTROL BOX,ASM(INDOOR)
264110 POWER CORD ASM
268714 PCB ASM(MAIN)
4995A20466U
4995A20463W
6411A20048M
4995A20463U
6871A10082J
6871A10082C
149410 KNOB ASM
237200 PANEL ASM,CONTROL
237204 PANEL,SIDE
4941A30015B
3720A20169A
3720A20186A
3831A30008A
6323A20003K
6323A20006A
3H00660C
238310 ESCUTCHEON
263230 THERMISTOR ASM
263230 THERMISTOR ASM
WOCZZ CAPACITOR,DRAWING(INDOOR)
WOCZZ CAPACITOR,DRAWING(OUTDOOR)
W6640 TERMINAL BLOCK
261704 TRANSFORMER,POWER
249940 CONTROL BOS ASM,SINGLE
147900 BARRIER,SINGLE
135510 COVER ASM(CONTROL)
554160 COMPRESSOR SET
550140 ISOLATOR,COMP
567502 O.L.P
35211A TUBE ASM,SUCTION
552114 TUBE ASM,DISCHARGE
552111 TUBE ASM,CAPILLARY
552113 TUBE ASM, CONDENSER OUT
552102 TUBE CAPILLARY,BEND
147911 BARRIER ASM,INDOOR
346810 MOTOR ASM(INDOOR)
349600 MOUNT,MOTOR
6120AR2194A
2520UKYK2BA
6120AR2194D
3H00390A
6120AR2194B
2520UKHK2AA
6170A20012A
4994A20052A
4790A20033A
3551A20062G
2520UKLK2BA
4H00982E
6750U-L061A
5211A21365A
5211A20531A
5211A20623D
5211A30434A
5210A22614D
B
C
6750U-L014A
6750U-L039A
-
-
-
-
-
-
-
-
-
-
D
4791A10005D
4681A20064E
4960A20026A
4791A10005A
4681A20064A
4960A20032A
359011 FAN ASM,CROSS FLOW
349011 DAMPER ASM
5901A10027A
4901A30002A
5230A20016A
3531A10149D
5230A20021A
3551A20197P
5300A20006A
5040A30032A
152302 FILTER(MECH),A/C
135312 GRILLE ASM,FRONT
152302 FILTER(MECH),A/C
135515 COVER ASM,TOP
753000 HEATER,ELECTRIC
W50400 RUBBER
E
F
546811 MOTOR ASM(OUTDOOR)
130411 BASE ASM,WELD
135500 DRAIN COVER
552206 DRAIN,VALVE
349600 MOUNT,MOTOR
149980 SHROUD
559010 FAN ASM,AXIAL
W48602 CLAMP,SPRING
4681A20063E
4681A20063A
3041A20028B
3550A20102A
5220A30006A
4960A20005A
4998A20001B
5900AR1173A
3H02932B
148000 BRACE
354210 EVAPORATOR ASM
554030 CONDENSER ASM
4800A20002A
5421A20118C
5403A20076B
5421A20118A
5403A20091D
5421A20118A
5403A20091D
—34—
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May, 2006
P/No.: 3828A20308H
Printed in Korea
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