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.
1.1 SAFETY PRECAUTIONS
1. When servicing the unit, turn off the air conditioner
and unplug the power cord.
2. Observe the original lead dress.
If a short circuit is found, replace all parts which
have been overheated or damaged by the short
circuit.
3. After servicing the unit, make an insulation
resistance test to protect the customer from being
exposed to shock hazards.
Push this button to shift mode of operation from COOL → ENERGY SAVER → FAN.
- 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-only operation.
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 min., and once again after another 30 min.
• Push Timer button to advance setting from 1Hour → 2Hours → ... → 12Hours maximum.
- START TIME
• If unit is off, use Timer to set number of hours before unit starts.
• Push Timer button to advance setting from 1Hour → 2Hours → ... → 12Hours maximum.
TEMPERATURE SETTING
• Use this button to automatically control the temperature of the room.
The temperature can be set within a range of 60°F to 86°F by increments of
1°F.
• The setting appears in the display.
• 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.
• When you first turn it on, the unit is in cool mode, High fan speed,
Temperature setting at 72°F.
FAN SPEED
• Every time you push this button, it advances the setting as follows:
{High → Low → Med → High}
• Designed for cooling only.
• Powerful and quiet cooling.
• Top-down chassis for the simple installation and service.
1.5 CONTROL LOCATIONS
1.5.1 COOLING ONLY MODEL
• OPERATION
• Side air-intake, side cooled-air discharge.
• Built in adjustable THERMISTOR and THERMOSTAT.
• Washable one-touch filter.
• Compact size.
• VENTILATION
Push the lever to the "CLOSE" position to cool, heat or recirculate room air only.
Pull the lever to the "OPEN" position to exhaust smoke or stale air from the room.
This feature is best used in conjunction with the FAN ONLY position.
CAUTION
When the air conditioner has been operating in the
cooling and is turned off or set to the fan only position,
wait at least 3 minutes before resetting to the cooling
operation again.
— Prior to disassembling the unit, make sure that the POWER is off and the power cord is unplugged from the
wall receptacle.
2.1 MECHANICAL PARTS
2.1.1 FRONT GRILLE
1. Open the inlet grille downward.
2. Remove the screw which fastens the front grille.
3. Pull the front grille from the right side.
4. Remove the front grille. (See Fig. 1)
5. Re-install the component by referring to the
removal procedure.
Figure 1
2.1.2 CABINET
1. After disassembling the FRONT GRILLE, remove
the 6 screws which fasten the cabinet at the both
sides and the top. (See Fig. 2)
Keep these for later use.
2.1.3 CONTROL BOX
1. Remove the front grille. (Refer to section 2.1.1)
2. Remove the screw which fasten the control
box. (See Fig. 3)
3. Pull the control box from the barrier.(See Fig.3)
4. Discharge the capacitor by placing a 20,000 ohm
resistor across the capacitor terminals.
5. Disconnect two 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. 3)
(Refer to the circuit diagram found on pages 27 in
this manual and on the control box.)
3. Re-install the components by referring to the
removal procedures, above.
2.3 ELECTRICAL PARTS
2.3.1 MOTOR
1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the clamp cord and disconnect the wire
housing in control box. (Refer to section 2.1.3)
3. Remove the turbo fan. (Refer to section 2.2.2)
4. Remove the fan. (Refer to section 2.2.2)
5. Remove the 4 or 2 screws which fasten the motor.
(See Fig. 10)
6. Remove the motor.
7. Re-install the components by referring to the
removal procedures, above.
2.3.2 COMPRESSOR
1. Remove the cabinet. (Refer to section 2.1.2)
2. Discharge the refrigerant system using a Freon
Recovery System.
If there is no valve to attach the recovery system
to, install one (such as a WATCO A-1) before
venting the Freon
TM
. Leave the valve in place after
servicing the system.
3. Disconnect the 3 leads from the compressor.
4. After purging the unit completely, unbraze the
suction and discharge tubes at the compressor
connections.
5. Remove the 3 nuts and the 3 washers which
fasten the compressor. (See Fig. 11)
6. Remove the compressor.
7. Re-install the components by referring to the
removal procedures, above.
TM
Figure 9
Figure 10
Figure 11
2.3.3 CAPACITOR
1. Remove the control box. (Refer to section 2.1.3)
2. Remove the 1 screw
3. Open the control box
4. Disconnect all the leads on the capacitor terminals.
5. Re-install the components by referring to the
removal procedures, above.
Discharge the refrigerant system using a 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 cabinet. (Refer to section 2.1.2)
2. Remove the brace.
(Refer to section 2.2.1)
3. Remove the 7 screws which fasten the condenser.
4. After discharging the refrigerant completely into a
FreonTMRecovery System, unbraze the
interconnecting tube at the condenser
connections.
5. Remove the condenser.
6. Re-install the components by referring to the notes
(See Fig. 15)
2.4.2 EVAPORATOR
1. Remove the cabinet. (Refer to section 2.1.2)
2. Discharge the refrigerant completely – into a
FreonTMRecovery System.
3. Remove the 2 screws which fasten the evaporator
at the left side and the right side.
4. Move the evaporator sideward carefully and then
unbraze the interconnecting tube at the evaporator
connectors.
5. Remove the evaporator.
6. Re-install the components by referring to the notes
(See Fig. 16)
TM
Figure 15
Figure 16
2.4.3 CAPILLARY TUBE
1. Remove the cabinet. (Refer to section 2.1.2)
2. After discharging the refrigerant completely – into
a FreonTMRecovery System, unbraze the
interconnecting tube at the capillary tube.
3. Remove the capillary tube.
4.
Re-install the components by referring to the notes.
1. When replacing the refrigeration cycle, be sure to
discharge the refrigerant system using a Freon
TM
recovery 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 unbrace 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.
17A.
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.
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. 17B.
Open valve C.
Discharge the line at the manifold connection.
5) The system is now ready for final charging.
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. 17B.
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.
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.
If you use an existing wall sleeve, you should measure its
dimensions.
Install the new air conditioner according to these installation
instructions to achieve the best performance. All wall sleeves
used to mount the new air conditioner must be in good
structural condition and have a compatible rear grille in order
to securely attach the new air conditioner. (FIG. 18A)
With the FRIEDRICH USC sleeve, you can maintain the
best performance of the new air conditioner. (FIG. 18B)
20-3/32"
(511 mm)
Air Conditioner
24"(610 mm)
14-13/32"
(366 mm)
18-15/32"(468 mm)
FIG. 18A
INSTALLATION HARDWARE
ITEMNAME OF PARTSQ'TY
PLASTIC GRILLE1
➀
VERTICAL INSULATION STRIP1
➁
AROUND INSULATION STRIPS2
➂
HORIZONTAL INSULATION STRIP1
➃
SUPPORT BLOCK2
➄
BAFFLE1
➅
TRIM FRAME2
➆
SHIM2
➇
PLASTIC NUTS AND WASHER SCREWS
➈
GRILLE REAR1
➉
4
FRIEDRICH USC Wall Sleeve
FIG. 18B
ELECTRICAL SERVICE
Check your available electrical service. The power supply
available must be the same as that shown on the unit
nameplate (found on left side of cabinet).
All models are equipped with a 3-prong service plug to
provide proper service and safe positive grounding. Do not
change plug in any way. Do not use an adapter plug. If your
present wall outlet does not match your plug, call a qualified
electrician to make the necessary corrections. SAVE
CARTON for storage and this OWNER'S MANUAL for future
reference. The carton is the best way to store unit during
winter or when not in use.
CAUTION
To avoid risk of personal injury, property damage, or
product damage due to the weight of this device and sharp
edges that may be exposed:
• Air conditioners covered in this manual pose an
excessive weight hazard. Two or more people are
needed to move and install the unit.
To prevent injury or strain, use proper lifting and carrying
techniques when moving unit.
• Carefully inspect location where air conditioner will be
installed. Be sure it will support the weight of the unit
over an extended period of time.
• Handle air conditioner with care. Wear protective gloves
whenever lifting or carrying the unit. AVOID the sharp
metal fins of front and rear coils.
• Make sure air conditioner does not fall during installation.
Installing the FRIEDRICH USC sleeve ensures
optional performances of the unit.
If you decide to keep the existing wall sleeve, you have
to redirect the louvers at the back of the wall sleeve.
Refer to FIG. 23 on p15. The use of pliers is
recommended. If you DO NOT redirect, you run the risk
of poor performance or premature product failure. This
is not covered under the terms of the FRIEDRICH
warranty.
• Pick a location which will allow the conditioned air to blow
into the area you want. Good installation with special
attention to the proper position of the unit will lessen the
chance that service will be needed.
ITEMS IN INSTALLATION HARDWARE
You may not need all parts in the kit. Discard unused parts
ITEM (inches)Qty.
Plastic grille26
Vertical insulation strip15
Around Insulation Strips
Horizontal Insulation Strip23
Support Block1
Baffle
Shim11
Trim Frame2
Washer Screw4
Nuts(Plastic)4
Grille Rear1
3
9
1
67
27
59
7
3
/
4
14 x
13
/
x 16
4
/
x 1
16
/
x 1
8
/
x 1
32
/32 x 1
3
x 1
1
4
/
x 1 x
16
1
/
2
3
3
/
/
x 1
8
/
3
x
8
3
/
8
x 4
x
/
8
x 1
1
/
3
8
25
/
32
3
/
x 1
8
3
/161
5
/
16
8
/
4
3
/
8
/
2
1
1
1
1
2
1
2
HOW TO INSTALL
Before installing the unit, identify the existing wall sleeve
1
from the list below.
NOTE: All wall sleeves used to mount the new Air
Conditioner must be in sound structural condition and have a
rear grille that securely attaches to sleeve, or rear flange that
serves as a stop for the Air Conditioner.
Remove old air conditioner from existing wall sleeve.
2
Clean the interior of an existing sleeve.
(Do not disturb seals.)
3
Wall sleeve must be securely fastened in wall before
installing the air conditioner. Use the nails or screws
4
through sleeve into wall, if needed. Repaint sleeve if
needed.
Prepare the wall sleeve for installation of the unit. If you
plan to use your existing wall sleeve, and it is not
5
FRIEDRICH, use procedure B or C below.
ProcedureBrand
A(page 16)
FRIEDRICH USC16-23/32
White-Westinghouse
Frigidaire Carrier
B
(pages 17~18)
(52F series)
General Electric
/Hotpoint
Depth(inches)
16, 17-1/2
or 22
16-7/8
Whirlpool17-1/8 or 23
Carrier (51S series)
C
(pages 19)
Install new unit into wall sleeve.
6
Fedders/Emerson16-3/4
Friedrich WSCor 19-3/4
Emerson/Fedders15
18-5/8
CAUTION: When installation is completed, replacement unit
MUST have a rearward slope as shown. To achieve 1/4"
slope, remove the backing from the 11-13/16" shim strips and
attach them as shown below in Fig. 19. Place the higher
portion of shim to the front of the rib on base of wall sleeve.
Brand
Wall Sleeve Dimensions (inches)
WidthHeightDepth
White-Westinghouse
Frigidaire
25-1/215-1/4
Carrier (52F series)
General Electric
/Hotpoint
2615-5/816-7/8
Whirlpool25-7/816-1/2
Fedders/Emerson
Friedrich WSCor 19-3/4
2716-3/4
FRIEDRICH USC25-7/815-17/3216-23/32
Emerson/Fedders26-3/415-3/415
Carrier (51S Series)25-3/416-7/818-5/8
If you are using the new sleeve (optionally supplied with
1
your unit),skip to step 3. Otherwise, install the plastic
grille from the kit. Cut the plastic grille to 25-1/2" wide
and 15-1/4" high. Place the plastic grille to the inside of
the wall sleeve at the rear flange.
Fasten the 4 washer screws to secure the grille to the
2
wall sleeve. If you need plastic nuts to mount plastic grille
to the inside of the wall sleeve, there are plastic nuts in
the installation kit. The nuts are installed from the inside
of the sleeve and are pressing into the square holes of
the rear flanges.Fasten the bracket to the upside of the
wall sleeve using the washer screw. The bracket
prevents the unit from leaving the sleeve.
FIG. 20
Install the new unit into the wall sleeve.
5
To assemble trim, snap the tab of each piece into the slot
6
of the other piece as shown below. Slide trim over the
front of the air conditioner until trim is flush with sleeve as
shown below.
FIG. 23
Fasten the screws and the bracket
Remove the backing from the Vertical Insulation strip
3
9
3
/
x 1
15
16
sleeve as shown below. Remove the backing from the
Around Insulation strip 67
3
/
/
x 1
and attach that to the inside right of the
8
8
1
3
x 1
25
/
/
x
and attach that
8
32
/
8
FIG. 21
to the inside front of the sleeve as shown below.
FIG. 22
Remove the metal rear grille and replace it with the plastic
4
rear grille to improve unit energy efficiency. The plastic grille
reduces the amount of hot air discharge that recirculates
through the unit.
FIG. 24
CAUTION
• Air conditioners covered in this manual pose an excessive
weight hazard. Two or more people are needed to move and
install the unit.
To prevent injury or strain, use proper lifting and carrying
techniques when moving unit.
• When handling the air conditioner, be careful to avoid cuts from
sharp metal fins on front and rear coils.
• Make sure air conditioner does not fall during removal.
• If unit does not operate after installation check, to be sure the
circuit interrupter has not been tripped. Refer to the
Troubleshooting guide for reset procedure.
Redirect the louvers at the back of the wall sleeve to 60°
1
angle as shown in the FIG 25. The use of pliers is
recommended.
Remove the backing from the Vertical Insulation strip
4
9
3
15
/
x 1
16
3
/
/
x 1
and attach that to the inside right of the
8
8
sleeve as shown below. Remove the backing from the
1
3
Around Insulation strip 67
/
x 1
8
25
/
/
x
8
and attach that to
32
the inside front of the sleeve as shown below.
If the wall sleeve already has a rear grille, skip to step 4.
2
If the wall sleeve does not have a rear grille or louvered
panel, install the plastic grille from the kit. Cut the plastic
grille to 25-1/2" wide and 15-1/4" high. Place the plastic
grille to the inside of the wall sleeve at the rear flange.
Place the plastic grille
Fasten the 4 washer screws to secure the grille to the
3
wall sleeve. If you need plastic nuts to mount plastic grille
to the inside of the wall sleeve, there are plastic nuts in
the installation kit. The nuts are installed from the inside
of the sleeve and are pressed into the square holes of
the rear flanges.Fasten the bracket to the upside of the
wall sleeve using the washer screw. The bracket
prevents the unit from leaving the sleeve.
FIG. 25
FIG. 26
Remove the metal rear grille and replace it with the
5
plastic rear grille to improve unit energy efficiency. The
plastic grille reduces the amount of hot air discharge that
recirculates through the unit.
If the depth of your existing wall sleeve is less than or
6
equal to 18", skip to step 7. Otherwise, cut the baffles
and the support blocks according to length "A" in the
table below.
Remove the backing from the support blocks and attach
7
them to the inside of the wall sleeve as shown FIG 31.
Slide the baffle into slots of the support blocks.
Install the new unit into the wall sleeve.
8
Assemble trim as described in Step 6,
9
Procedure A.
FIG. 31
CAUTION
• Air conditioners covered in this manual pose an
excessive weight hazard. Two or more people are
needed to move and install the unit.
To prevent injury or strain, use proper lifting and carrying
techniques when moving unit.
• When handling the air conditioner, be careful to avoid
cuts from sharp metal fins on front and rear coils.
• Make sure air conditioner does not fall during removal.
• If unit does not operate after installation check, to be sure
the circuit interrupter has not been tripped. Refer to the
Troubleshooting guide for reset procedure.
Redirect the louvers at the back of the wall sleeve to 60°
1
angle as shown in the FIG 32. The use of pliers is
recommended.
Remove the backing from the Horizontal Insulation strip
4
7
3
23
/
x 1
32
3
/
/
x 1
8
and attach that to the inside right of the
16
sleeve as shown below. Remove the backing from the
27
3
Around Insulation strip 59
/
x 1
32
3
/
/
x 1
and attach that
8
8
to the inside front of the sleeve as shown below.
FIG. 32
If the wall sleeve already has a rear grille, skip to step 4. If the
2
wall sleeve does not have a rear grille or louvered panel, install
the plastic grille from the kit. Cut the plastic grille to 26-1/2"
wide and 15-1/2" high or to the sleeve dimensions. Place the
plastic grille to the inside of the wall sleeve at the rear flange.
Place the plastic grille
Fasten the 4 washer screws to secure the grille to the
3
wall sleeve. If you need plastic nuts to mount plastic grille
FIG. 33
to the inside of the wall sleeve, there are plastic nuts in
the installation kit. The nuts are installed from the inside
of the sleeve and are pressed into the square holes of
the rear flanges. Fasten the bracket to the upside of the
wall sleeve using the washer screw. The bracket
prevents the unit from leaving the sleeve.
FIG. 35
If the depth of your existing sleeve is less than or equal
to 18”, skip to step 7. Otherwise, cut the baffles and the
5
support blocks according to Length "A" in the table
below.
Remove the backing from the support blocks and attach
6
them to the inside of the wall sleeve as shown FIG 37.
Slide the baffle into slots of the support blocks
To achieve rearward slope for unit draining, remove the
7
backing from the 11
shown below in Fig. 39. The higher portion of shim is to
be placed in front of the rib on the base of wall sleeve.
Remove the metal rear grille and replace it with the
8
plastic rear grille to improve unit energy efficiency. The
plastic grille reduces the amount of hot air discharge that
recirculates through the unit.
13
/
" shim strips and attach them as
16
Shim (2EA)
6"6"
FIG. 38
FIG. 39
CAUTION
• Air conditioners covered in this manual pose an
excessive weight hazard. Two or more people are
needed to move and install the unit.
To prevent injury or strain, use proper lifting and
carrying techniques when moving unit.
• When handling the air conditioner, be careful to avoid
cuts from sharp metal fins on front and rear coils.
• Make sure air conditioner does not fall during
removal.
• If unit does not operate after installation check, to be
sure the circuit interrupter has not been tripped. Refer
to the Troubleshooting guide for reset procedure.
Install the new unit into the wall sleeve
9
Assemble trim as described in Step 6, Procedure A.
Following is a brief description of the important components and their functions in the refrigeration system.
Refer to Fig. 41 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle.
Check outdoor coil
(heat exchanger) & the fan
operation.
Check gas leakage.
Repair gas leak.
Replacement of unit if the
unit is beyond repair.
Satisfactory operation with
temperature difference of
inlet & outlet air ; 44.6~50˚F
Check heat load increase.
Unexpected residue
Overloaded Circuit
Check inside gas pressure.
Adjusting of refrigerant
charge
Malfunction of compressor
Replacement of
compressor
Check cold air circulation
for smooth flow.
Dirty indoor coil
(Heat exchanger)
Malfunction of fan
Clogged air filter
Obstruction at air outlet
Correct above troubles
Stop auto air-swing
Check clogging in
refrigeration circuit.
Repair clogging in
refrigeration circuit.
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.
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.
Connect wire. Refer to wiring diagram for terminal
identification. Repair or replace loose terminal.
Test capacitor.
Replace if not within ±10% of manufacturer's
rating. Replace if shorted, open, or damaged.
Fan blade hitting shroud or blower wheel hitting
scroll. Realign assembly.
Units using slinger ring condenser fans must
have 1/4to 5/16inch clearance to the base. If it is
hitting the base, shim up the bottom of the fan
motor with mounting screw(s).
Fan motor runs
intermittently
Fan motor noise.
Revolves on overload.
Grommets
Fan
Turbo fan
Loose set screw
Check fan motor bearings; if motor shaft will not
rotate, replace the motor.
Check voltage. See limits on page 27. 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.
Check grommets; if worn or missing, replace them.
If cracked, out of balance, or partially missing,
replace it.
If cracked, out of balance, or partially missing,
replace 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.
LGE Internal Use Only
Page 25
COMPLAINTCAUSEREMEDY
Compressor will not run,
but fan motor runs.
Voltage
Wiring
Rotary
Thermostat
Capacitor (Discharge
capacitor before
servicing.)
Compressor
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.
Check for continuity, refer to the wiring diagram
for terminal identification. Replace the switch if
circuit is open.
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.
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.
Overload
Check the compressor overload, if externally
mounted. Replace if open. (If the compressor
temperature is high, remove the overload, cool it,
and retest.)
Capacitor
Wiring
Refrigerating system
Air filter
Exhaust damper door
Unit undersized
Blower or fan
Copper tubing
Check the voltage. See the limits on the preceding page. If not within limits, call an electrician.
Check overload, if externally mounted.
Replace if open. (If the compressor temperature
is high, remove the overload, cool, and retest.)
If not running, determine the cause. Replace if
required.
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.
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.
Test capacitor.
Check the terminals. If loose, repair or replace.
Check the system for a restriction.
If restricted, clean of replace.
Close if open.
Determine if the unit is properly sized for the area to
be cooled.
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.
Remove the cabinet and carefully rearrange tubing
not to contact cabinet, compressor, shroud, and
barrier.