LG LP070CEM User manual

LG Packaged Terminal
Air Conditioner/Heat Pump
SERVICE MANUAL
LG
CAUTION
http://www.lgservice.com
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• FOR AUTHORIZED SERVICE ONLY.
PTAC DIRECT SALES [phone]

—2—
1. PREFACE
1.1 SPECIFICATIONS ..........................................3
1.2 FEATURES AND BENEFITS..........................4
1.3 CONTROL LOCATIONS.................................6
1.4 ADDITIONAL CONTROLS..............................8
2.
DISASSEMBLY INSTRUCTIONS
2.1 MECHANICAL PARTS..................................10
2.1.1 FRONT GRILLE...................................10
2.1.2 CONTROL BOX...................................11
2.2 AIR HANDLING PARTS................................12
2.2.1 ELECTRIC HEATER
(Electric heater model only) .................11
2.2.2 CROSS FLOW FAN.............................12
2.2.3 AXIAL FAN...........................................13
2.2.4 SHROUD..............................................13
2.3 ELECTRICAL PARTS...................................14
2.3.1 OUTDOOR MOTOR ............................14
2.3.2 INDOOR MOTOR ................................14
2.3.3 COMPRESSOR...................................14
2.3.4 CAPACITOR........................................14
2.3.5 POWER CORD....................................14
2.3.6 P.C.B....................................................15
2.4 REFRIGERATION CYCLE............................15
2.4.1 CONDENSER......................................16
2.4.2 EVAPORATOR....................................16
2.4.3 CAPILLARY TUBE...............................16
3. INSTALLATION
3.1 HOW TO INSTALL THE UNIT ......................17
3.2 SUGGESTED TOOL REQUIREMENTS.......19
3.2.1 PREPARATION OF SLEEVE ..............20
3.2.2 PREPARATION OF THE FRONT
GRILLE ................................................20
3.2.3 UNIT INSTALLATION..........................21
3.3 ELECTRICAL REQUIREMENTS..................22
3.3.1 ELECTRICAL DATA (FOR 230V/208 MODEL)........ 22
3.3.2 ELECTRICAL SAFETY ............................ 22
4.
FIELD INSTALLED ACCESSORIES
...
23
5. FERFORMANCE DATA ................................. 39
6. TROUBLESHOOTING GUIDE
6.1 OUTSIDE DIMENSIONS...............................44
6.2 PIPING SYSTEM ..........................................44
6.3 TROUBLESHOOTING GUIDE......................45
7. SCHEMATIC DIAGRAM.....................50
8. EXPLODED VIEW..................................52
9. REPLACEMENT PARTS LIST.......53
1. PREFACE
This SERVICE MANUAL provides various service information, including the mechanical and electrical
parts, etc. This room air conditioner was manufactured and assembled under a strict quality control system.
The refrigerant is charged at the factory. Be sure to read the safety precautions prior to servicing the unit.
CONTENTS
PTAC DIRECT SALES [phone]

—3—
LP 12 0 C M 2
12 34 5 6 7 8
Digits 1,2 - LG Packaged Terminal Air Conditioner Digit 6 - Product Type
Digits 3,4 - Unit Cooling Capacity C = Air Conditoner
07 = 7,000 Btu/h H = Heat Pump
09 = 9,000 Btu/h Digit 7- Electric Heat
12 = 12,000 Btu/h E = Electric Heater
15 = 15,000 Btu/h Digit 8 - Electric Type
D = Manual Control
M = Electronic Control
1.1 SPECIFICATIONS
LP070CEM 7,600/7,400 600/580 12.7/12.7 2.5kW E/Heater 2.7/2.9 20
LP090CEM 9,000/8,800 770/750 11.7/11.7 3.5kW E/Heater 3.5/3.8 20
LP120CEM 11,800/11,500 1,055/1,025 11.2/11.2 3.5kW E/Heater 4.8/5.2 20
LP150CEM 14,300/14,100 1,430/1,410 10.0/10.0 3.5kW E/Heater 6.5/7.1 20
LP070CED 7,600/7,400 600/580 12.7/12.7 2.5kW E/Heater 2.7/2.9 20
LP090CED 9,000/8,800 770/750 11.7/11.7 3.5kW E/Heater 3.5/3.8 20
LP120CED 11,800/11,500 1,055/1,025 11.2/11.2 3.5kW E/Heater 4.8/5.2 20
LP150CED 14,300/14,100 1,430/1,410 10.0/10.0 3.5kW E/Heater 6.5/7.1 20
Model Name Cooling (Btu/h) Cooling Watts (W) EER Electric Heat Rated Amp,
Cooling Mini Circuit Protection (Amps)
Cooling/Electric Heater
LP070HEM 7,600/7,300 600/575 12.7/12.7 6,400/6,200 3.5/3.5 2.5kW E/Heater 535/520 2.7/2.9 2.4/2.6 20
LP090HEM 9,100/8,900 775/760 11.7/11.7 8,200/8,000 3.4/3.4 3.5kW E/Heater 705/690 3.7/3.9 3.2/3.5 20
LP120HEM 12,100/11,800 1,090/1,065 11.1/11.1 10,900/10,700 3.3/3.3 3.5kW E/Heater 970/950 5.0/5.4 4.4/4.8 20
LP150HEM 14,300/14,100 1,460/1,440 9.8/9.8 13,500/13,300 3.1/3.1 3.5kW E/Heater 1,275/1,255 6.7/7.3 5.8/6.3 20
LP070HED 7,600/7,300 600/575 12.7/12.7 6,400/6,200 3.5/3.5 2.5kW E/Heater 535/520 2.7/2.9 2.4/2.6 20
LP090HED 9,100/8,900 775/760 11.7/11.7 8,200/8,000 3.4/3.4 3.5kW E/Heater 705/690 3.7/3.9 3.2/3.5 20
LP120HED 12,100/11,800 1,090/1,065 11.1/11.1 10,900/10,700 3.3/3.3 3.5kW E/Heater 970/950 5.0/5.4 4.4/4.8 20
LP150HED 14,300/14,100 1,460/1,440 9.8/9.8 13,500/13,300 3.1/3.1 3.5kW E/Heater 1,275/1,255 6.5/7.3 5.8/6.3 20
Model Name Cooling
(Btu/h) Cooling Watts (W) EER
Reverse
Cycle (Btu/h)
COP Electric Heat
Rated Watts,
Heating
Rated Amp,
Cooling Rated Amp, Heating
Mini Circuit
Protection (Amps)
Cooling/Heat Pump/Electric
PTAC DIRECT SALES [phone]

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.
• 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.
—4—
INDOOR
REAR GRILLE
(Aluminum Rear Grille)
EXPANDED METAL GRILLE
(Superior for a performance)
SLEEVE ASSEMBLY
(Including Aluminum Rear Grille)
THE SLEEVE ANDTHE REAR GRILLE
(Available as an option)
VERTICAL AIR DEFLECTOR
(Horizontal Louver)
AIR FILTER
INLET GRILLE
(Air Intake)
PTAC DIRECT SALES [phone]

•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 - (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—
PTAC DIRECT SALES [phone]

—6—
1.3 CONTROL LOCATIONS
•OPERATION
ELECTRIC HEATING MODEL COOLING ONLY MODEL
VENT
OPEN
VENT
CLOSE
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.
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.
•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.
The damper is opened and outdoor air is drawn into the room.
This will reduce the cooling or heating efficiency.
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.
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.
CAUTION
NOTE
PTAC DIRECT SALES [phone]

—7—
•ELECTRONIC CONTROLS
The controls will look like one of the following.
TEMP/TIME
MODE
HEATHEAT
E/SAVEE/SAVE
FANFAN
COOLCOOL
HIGHHIGH
LOWLOW TIMERTIMER
FAN TIMER
'
F
ON
OFF
ON
OFF
REMOTE CONTROL SIGNAL
RECEIVER
POWER
MODE
- Push this button to cycle through the modes from COOL → FAN
→ HEAT→ COOL.
- COOL
• Fan runs continually for normal cooling operation.
- ENERGY SAVER
• The fan stops when the compressor stops cooling.
Approximately every 3 minutes the fan will turn on and the unit
will check the room air temperature to determine if cooling is
needed.
- FAN
• Fan operation without heating or cooling.
TIMER
- SHUT-OFF TIME
• You will usually use shut-off time while you sleep.
• If unit is running, use Timer to set number of hours until shut-off.
• For your sleeping comfort, once Time is set, the Temperature setting will raise 2°F after 30 minutes, and once again
after another 30 minutes.
• Push Timer to cycle through the settings from 1 Hour →2 Hours → ... → 12 Hours maximum.
TEMPERATURE SETTING
• Use this button to automatically control the
temperature of the room.
The temperature can be set within a range of
54°F to 86°F by increments of 1°F.
• The setting appears in the display.
FAN SPEED
• Every time you push this button, it cycles through the settings as follows: {High →Low →High →Low}
• To turn the air conditioner ON, push this button.
To turn the air conditioner OFF, push the button
again.
• This button takes priority over any other button.
• At initial power-up, the unit defaults to COOL
mode, HIGH fan, 72˚ F.
F1 LOW
F2 HIGH
PTAC DIRECT SALES [phone]

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.
•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 switches #1 - #3.
This temperature limiting is not available with the Remote Wall Thermostat.
—8—
LOCAL
1OFF
2OFF 3OFF 4OFF 5
LOCAL
1OFF
2OFF 3OFF 4OFF 5
ON ONREMOTE
OFF
ON ON ON
Remote/Local
Energy Saver
Temperature Limit 1
Temperature Limit 2
Temperature Limit 3
LOCALLOCAL
1OFF
OFF
2OFF
OFF
3OFF
OFF
4OFF
OFF
5
LOCAL
1OFF
2OFF 3OFF 4OFF 5
LOCALLOCAL
1OFF
OFF
2OFF
OFF
3OFF
OFF
4OFF
OFF
5
LOCAL
1OFF
2OFF 3OFF 4OFF 5
OFF OFF OFF 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)
86°F (30.0°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)
ON OFF OFF 56°F (13.3°C) 84°F (28.9°C)
OFF ON OFF 58°F (14.4°C) 82°F (27.8°C)
ON ON OFF 60°F (15.5°C) 80°F (26.7°C)
OFF OFF ON 62°F (16.6°C) 78°F (25.5°C)
ON OFF ON 64°F (17.7°C) 76°F (24.4°C)
OFF ON ON 66°F (18.9°C) 74°F (23.3°C)
ON ON ON 68°F (20.0°C) 72°F (22.2°C)
Temperature Temperature Temperature
Limit #1 Limit #2 Limit #3 Lowest Temp. Highest Temp. Lowest Temp. Highest Temp.
Cooling Operation Heating Operation
Cooling+Electric HeaterOFFOFF Cooling OnlyONOFF
Cooling Only+Heat Pump
Heat Pump Only
Unit Type
ON
OFF
#7
ON
ON
#6
PTAC DIRECT SALES [phone]

•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 cycle 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 LO and 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.
•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.
—9—
Wire # AWG Maximum Length
#22 600 ft (180 m)
#20 900 ft (270 m)
#18 1500 ft (450 m)
#16 2000 ft (610 m)
GL GH O W Y R CLO LI
Front Desk Switch
LO LI GL GH O W Y R C
Low Fan
High Fan
Reversing Valve
Heater
Compressor
24 Volt-L
24 Volt-N
Wiring Schematic for
Remote Heat Pump
Wiring Schematic for
Straight Cool Unit.
Note: The following figures show wiring
schematics for heat pump and straight cool
units with electric heat, respectively.
PTAC DIRECT SALES [phone]

—10—
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.
• 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 the alternate position, the
louvers will be at an angle of 15˚ off vertical.
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.
2. DISASSEMBLY INSTRUCTIONS
— Before the following disassembly, POWER SWITCH is set to OFF and disconnected the power cord.
Figure 1
40˚
15˚
Screws
PTAC DIRECT SALES [phone]