Friedrich Uni-Fit Thru-the-Wall Series User manual

Unifit Heat Cool Svc Parts 2010 (05/10)
Thru-the-Wall Series
230 Volts UE10C33 UE12C33
Unifit. Cool (03/07)
Thru-the-Wall Series
Service and Parts
Manual
115 Volts UE08C13
Uni- Fit R

2Room Air Conditioner
Air Conditioner Service Manual
TABLE OF CONTENTS
Safety Precautions ..........................................................................................................................................3
Operating Instructions ..................................................................................................................................7
Controls.................................................................................................................................................... 7
Remote control......................................................................................................................................... 8
Disassembly instructions ............................................................................................................................. 9
Mechanical Parts...................................................................................................................................... 9
Air Handling Parts ...................................................................................................................................10
Electrical Parts ........................................................................................................................................11
Refrigeration Cycle..................................................................................................................................13
Schematic Diagram........................................................................................................................................16
Wiring Diagram........................................................................................................................................16
Troubleshooting Guide ................................................................................................................................17
Piping System .........................................................................................................................................17
Troubleshooting Guide ............................................................................................................................18
Room Air Conditioner Voltage Limits.......................................................................................................21
Product specifications............................................................................... .........................23~25
Exploded Vi ew .............................................................................................................................................26
Replacement Parts List ...............................................................................................................................27~29
........................................

Service Manual 3
Safety Precautions
Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must
be followed.
■Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.
■Meanings of symbols used in this manual are as shown below.
WARNING
CAUTION
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to property only.
WARNING
■Installation
Don’t use a power cord, a plug
or a loose socket which is dam-
aged.
• Otherwise, it may cause a fire or
electrical shock.
Always plug into a grounded
outlet.
• Otherwise, it may cause a fire or
electrical shock.
Do not modify or extend the
power cord length.
• It will cause electric shock or fire
due to heat generation.
Do not disassemble or modify
products.
• It may cause failure and electric
shock.
Be caution when unpacking and
installing.
• Sharp edges may cause injury.
Do not use the power cord near flam-
mable gas or combustibles such as
gasoline, benzene, thinner, etc.
• It may cause explosion or fire.
Be sure not to do.
Be sure to follow the instruction.
MODE TIMER POWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
Gasolin
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH

4Room Air Conditioner
Safety Precautions
■Operation
Do not place heavy object on the
power cord and take care so that
the cord should not be pressed.
• There is danger of fire or electric
shock.
Do not share the outlet with
other appliances.
• It will cause electric shock or fire
due to heat generation.
Take the power plug out if neces-
sary, holding the head of the plug
and do not touch it with wet hands.
• Otherwise, it may cause a fire or
electrical shock.
Do not place the power cord
near a heater.
• It may cause fire and electric
shock.
Do not allow water to run into
electric parts.
• It will cause failure of machine or
electric shock.
Use a soft cloth to clean. Do not
use wax, thinner, or a strong
detergent.
• The appearance of the air condi-
tioner may deteriorate, change
color, or develop surface flaws.
Unplug the unit if strange
sounds, odors, or smoke come
from it.
• Otherwise it may cause fire and
electric shock accident.
Do not open the suction inlet
grill of the product during opera-
tion.
• Otherwise, it may electrical
shock and failure.
If water enters the product, turn off the the
power switch of the main body of appliance.
Contact service center after taking the
power-plug out from the socket.
Ventilate the room well when
using this appliance together
with a stove, etc.
• An oxygen shortage may occur.
Turn off the power and breaker
firstly when cleansing the unit.
• Since the fan rotates at high speed
during operation, it may cause
injury.
Turn off the main power switch
when not using it for a long
time.
• Prevent accidental startup and the
possibility of injury.
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
Wax
Thinner
MODE TIMER POWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODE TIMER POWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODE TIMER POWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODE TIMER POWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH

Service Manual 5
Safety Precautions
Do not operate or stop the unit
by inserting or pulling out the
power plug.
• It will cause electric shock or fire
due to heat generation.
Do not damage or use an
unspecified power cord.
• It will cause electric shock or fire.
Do not operate with wet hands
or in damp environment.
• It will cause electric shock.
Hold the plug by the head when
taking it out.
• It may cause electric shock and
damage.
When gas leaks, open the win-
dow for ventilation before oper-
ating the unit.
• Otherwise, it may cause explo-
sion, and a fire.
Never touch the metal parts of
the unit when removing the fil-
ter.
• They are sharp and may cause
injury.
Install the product so that the noise or hot wind
from the outdoor unit may not cause any damage
to the neighbors.
• Otherwise, it may cause dispute with the neighbors.
Keep level parallel in installing the product.
• Otherwise, it may cause vibration or water leakage.
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
CAUTION
■Installation

6Room Air Conditioner
Safety Precautions
Do not put a pet or house plant
where it will be exposed to
direct air flow.
• It may cause injury.
Do not block the inlet or outlet
of air flow.
• It may cause product failure.
Use a soft cloth to clean. Do not
use wax, thinner, or a strong
detergent.
• The appearance of the air condi-
tioner may deteriorate, change
color, or develop surface flaws.
Do not step on the indoor/out-
door unit and do not put any-
thing on it.
• It may cause an injury through
dropping of the unit or falling
down.
Always insert the filter securely.
Clean it every two weeks.
• Operation without filters will cause
failure.
Do not drink water drained from
air conditioner.
• It contains containments and will
make you sick.
Be cautious not to touch the
sharp edges when installing.
• It may cause injury.
Avoid excessive cooling and
perform ventilation sometimes.
• Otherwise, it may do harm to
your health.
Do not insert the hands or bars
through the air inlet or outlet
during operation.
• Otherwise, it may cause person-
al injury.
■Operation
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH

7Room Air Conditioner
Operating Instructions
Controls
FAN SPEED
Every time you push this button,it advances the setting as follows:{High[F2] Low[F1]} High[F2]
REMOTE CONTROL SIGNAL
RECEIVER
TEMPERATURE SETTING
Use this button to automatically control the
temperature of the room
The tmeperature can be set within a range of
60 F to 86 F by increments of 1 F.
。
。
。
The setting appears in the display.
POWER
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.
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 Timer 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→ 2Hour →...
→12Hours maximum.
START TIME
If unit is off,use Timer to set number of hours before nuit starts.
Push Timer button to advance setting from 1Hour→ 2Hour →...
→12Hours maximum.
MODE
Push this button to shift mode of operation from COOL → MONEY SAVER→ FAN ONLY→HEAT
COOL:
Fan runs continually for normal cooling operation.
MONEY SAVER:
The fan stops when the compressor stops cooling.Approximately every 3 minutes the fan will turn on and the nuit will
check the room air temperature to determine if cooling is needed.
FAN ONLY:
Fan-only operation.
HEAT:
Fan runs continually for normal heating operation.
AUTO RESTART
When power is restored after an electrical power failure,the unit will begin to run at its last setting.

Service Manual 8
REMOTE CONTROL
POWER
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.
Use this button to automatically control the temperature of the room.
The tmeperature can be set within a range of
increments of 1 F.
。
The setting appears in the display.
60 F to 86 F by
。
。
TEMPERATURE SETTING
FAN SPEED
Every time you push this button,it advances the setting as follows:
Low[F1]} High[F2]
{High[F2]
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 Timer is set，the Temperature setting will
，
and once again after another 30 min.
。
raise 2 F after 30 min
Push Timer button to advance setting from 1Hour→ 2Hour →...
→12Hours maximum.
START TIME
If unit is off,use Timer to set number of hours before nuit starts.
Push Timer button to advance setting from 1Hour→ 2Hour →...
→12Hours maximum.
MODE
Push this button to shift mode of operation from COOL → MONEY SAVER→ FAN ONLY→HEAT
COOL:
Fan runs continually for normal cooling operation.
MONEY SAVER:
The fan stops when the compressor stops cooling.Approximately every 3 minutes the fan will turn on and the nuit will
check the room air temperature to determine if cooling is needed.
FAN ONLY:
Fan-only operation.
HEAT:
Fan runs continually for normal heating operation.
CAUTION
When the air conditioner has been performed its
cooling or feating operation and is turned off or
set to the fan position，wait at 3 minutes
before resetting to the cooling operation again.
A slight heat odor may come from the nuit
when first switching to HEAT after the
cooling season is over.This odor,caused
by fine duct particles on the heater,will
disappear quickly.This is harmless.

Service Manual 9
Disassembly Instructions
Disassembly Instructions
Mechanical Parts
—Before the following disassembly, POWER SWITCH is set to OFF and disconnected the power cord.
1. FRONT GRILLE
1. Open the inlet grille upward or 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.
2. CABINET
1. After disassembling the FRONT GRILLE, remove the 9
screws which fasten the cabinet at the both sides and the
top. (See Fig. 2)
Keep these for later use.
3. CONTROL BOX
1. Remove the front grille. (Refer to section 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 24 in this
manual and on the control box.)
FIG. 1
FIG. 3
FIG. 2
MODE TIMER POWER
FAN
SPEED
Fan
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2MED
F3HIGH
MODE TIMER POWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODE TIMER POWER
FAN
SPEED
Fan
Heat
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2HIGH
MODETIMERPOWER
FAN
SPEED
Fan
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2MED
F3HIGH

10 Room Air Conditioner
Disassembly Instructions
4. ORIFICE, HEATER ASSY AND TURBO FAN
1. Remove the front grille. (Refer to section 1)
2. Remove the cabinet. (Refer to section 2)
3. Remove the 2 screws which fasten the evaporator
at the left side and the right side.
(See Fig. 4)
4. Move the evaporator sideward carefully.
5. Remove the 2 terminals carefully
(See Fig. 28, at Electric Heater Model only)
6. Remove the 4 screws which fasten the orifice. (See
Fig. 5)
7. Remove the orifice. (See Fig. 5)
8. Remove the clamp which secures the turbo fan with
plier. (See Fig. 6)
9. Remove the turbo fan with plier or your hand with-
out touching blades. (See Fig. 7)
10. Re-install the components by referring to the
removal procedure, above.
5. FAN
1. Remove the cabinet. (Refer to section 2)
2. Remove the brace and shroud cover.
(Refer to section 4)
3. Remove the 6 screws which fasten the condenser.
4. Move the condenser sideways carefully.
5. Remove the clamp which secures the fan.
6. Remove the fan. (See Fig. 8)
7. Re-install the components by referring to the removal
procedure, above.
Air Handling Parts
MODE TIMER POWER
FAN
SPEED
Fan
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2MED
F3HIGH
FIG. 4
FIG. 5
FIG. 6
FIG. 7
FIG. 8

Service Manual 11
6. SHROUD
1. Remove the fan. (Refer to section 5)
2. Remove the screw which fasten the shroud.
3. Remove the shroud. (See Fig. 9)
4. Re-install the component by referring to the
removal procedure, above.
7. MOTOR
1. Remove the cabinet. (Refer to section 2)
2. Remove the clamp cord and disconnect a wire
housing in control box. (Refer to section 3)
3. Remove the turbo fan. (Refer to section 5)
4. Remove the fan. (Refer to section 5)
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 procedure, above.
8. COMPRESSOR
1. Remove the cabinet. (Refer to section 2)
2. Discharge the refrigerant system using FreonTM
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.
3. Disconnect the 3 leads from the compressor.
4. After purging the unit completely, unbraze the suc-
tion and discharge tubes at the compressor con-
nections.
5. Remove the 3 nuts and the 3 washers which fas-
ten the compressor. (See Fig. 11)
6. Remove the compressor.
7. Re-instill the components by referring to the
removal procedure, above.
9. CAPACITOR
1. Remove the control box. (Refer to section 3)
2. Remove a screw which fasten the display panel.
3. Remove 2 screws and unfold the control box.
(See Fig. 12)
4. Remove the screw and the clamp which fastens
the capacitor. (See Fig. 12)
5. Disconnect all the leads of capacitor terminals.
6. Re-install the components by referring to the
removal procedure, above.
Disassembly Instructions
Electrical Parts
FIG. 9
FIG. 11
FIG. 12
MODE TIMER POWER
FAN
SPEED
Fan
Energy
Saver
Cool
Timer
TEMP
'
F
F1 LOW
F2 MED
F3 HIGH
FIG. 10

12 Room Air Conditioner
Disassembly Instructions
10. POWER CORD
1. Remove the control box. (Refer to section 3)
2. Unfold the control box. (Refer to section 9)
3. Disconnect the grounding screw from the control
box.
4. Disconnect 2 receptacles.
5. Remove a screw which fastens the clip cord.
6. Pull the power cord. (See Fig. 13)
7. Re-install the component by referring to the
removal procedure, above.
(Use only one ground-marked hole for ground
connection.)
8. 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 fit-
ted to the unit.)
11. THERMOSTAT
1. Remove the control box. (Refer to section 3)
2. Unfold the control box. (Refer to section 9)
3. Disconnect the theristor terminals from main
P.W.B assembly.
4. Remove the thermostat. (See Fig. 14)
5. Re-install the components by referring to the
removal procedure, above.
MODE TIMER POWER
FAN
SPEED
Fan
Energy
Saver
Cool
Timer
TEMP
'
F
F1 LOW
F2 MED
F3 HIGH
MODE TIMER POWER
FAN
SPEED
Fan
Energy
Saver
Cool
Timer
TEMP
'
F
F1 LOW
F2 MED
F3 HIGH
FIG. 13
FIG. 14

Service Manual 13
Disassembly Instructions
12. CONDENSER
1. Remove the cabinet. (Refer to section 2)
2. Remove the brace and the shroud cover.
(Refer to section 4)
3. Remove the 5 screws which fasten the condenser.
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. 15)
13. EVAPORATOR
1. Remove the cabinet. (Refer to section 2)
2. Discharge the refrigerant completely.
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 notes.
(See Fig. 16)
14. CAPILLARY TUBE
1. Remove the cabinet. (Refer to section 2)
2. After discharging the refrigerant completely,
unbraze the interconnecting tube at the capillary
tube.
3. Remove the capillary tube.
4. Re-install the components by referring to notes.
FIG. 15
FIG. 16
Refrigerating Cycle
Discharge the refrigerant system using FreonTM
Recovery System.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before vent-
ing the FreonTM. Leave the valve in place after
servicing the system.
CAUTION
MODE TIMER POWER
FAN
SPEED
Fan
Energy
Saver
Cool
Timer
TEMP
'
F
F1LOW
F2MED
F3HIGH

14 Room Air Conditioner
Disassembly Instructions
—Replacement of the refrigeration cycle.
1. When replacing the refrigeration cycle, be sure to
discharge the refrigerant system using a FreonTM
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 counterclock-
wise 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.
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 man-
ifold 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 39 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.
NOTICE
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.
CAUTION

Service Manual 15
Disassembly Instructions
Equipment needed: Vacuum pump, Charging cylinder, Manifold gauge, Brazing equipment. Pinch-off tool capa-
ble of making a vapor-proof seal, Leak detector, Tubing cutter, Hand Tools to remove components, Service valve.
A
COMPOUND GAUGE
EVAPORATOR
(LOW PRESSURE SIDE)
COMPRESSOR
CAPILLARY TUBE
CONDENSER
(HIGH PRESSURE SIDE)
SEE INSETS
BELOW
MANIFOLD
GAUGE
B
FIG. 17A-Pulling Vacuum FIG 17B-Charging
A
B
EXTERNAL
VACUUM PUMP
A
CHARGING
CYLINDER
LOW HI
B
C

16 Room Air Conditioner
Schematic Diagram
Schematic Diagram
Wiring Diagram
■ELECTRIC HEATING MODEL

Troubleshooting Guide
Troubleshooting Guide
Piping System
Following is a brief description of the important components and their functions in the refrigeration system.
Refer to Fig. 18 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle.
MOTOR
COMPRESSOR
OIL
(LIQUID REFRIGERANT)
CAPILLARY TUBE
OUTSIDE COOLING
AIR FOR REFRIGERANT
PASS THROUGH
SUCTION LIME
COOL LOW PRESSURE VAPOR
COOLED
AIR
COMPLETE LIQUID
BOIL OFF POINT
LIQUID
PRESSURE
DROP
ROOM AIR HEAT LOAD
VAPOR INLET HOT
DISCHARGED
AIR
LIQUID OUTLET
HIGH PRESSURE VAPOR
LIQUID PEFRIGERANT
LOW PRESSURE VAPOR
ROOM AIR CONDITIONER
EVAPORATOR COILS CONDENSER COILS
CYCLE OF REFRIGERATION
CONDENSER COILS
EVAPORATOR COILS
FAN
MOTOR
: REFRIGERANT FLOW
TURBO FAN
CAPILLARY TUBE
COMPRESSOR
FIG. 18
Service Manual 17

18 Room Air Conditioner
Troubleshooting Guide
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 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 of inside gas
pressure.
Adjusting of refrigerant
charge
Malfunction of compressor
Replacement of
compressor
Check of cold air circulation
for smooth flow.
Dirty indoor coil
(Heat exchanger)
Malfunction of fan
Clogged of air filter
Obstruction at air outlet
Correct above trouble
Stop of auto air-swing
Check clogging in
refrigeration circuit.
Repair clogging in
refrigeration circuit.

Service Manual 19
Troubleshooting Guide
Fails to Start
Check of circuit breaker
and fuse.
Gas leakage of feeler bulb
of thermostat
Check of control switch.
Only fan fails to start.
Improper wiring.
Defect of fan motor
capacitor.
Irregular motor resistance
( ).
Irregular motor insulation
( ).
Replacement of fan motor
Regular but fails to start
Replacement of compressor
(locking of rotor, metal)
Improper thermostat setting
Loose terminal connection.
Improper wiring
Irregular motor resistance ( )
Irregular motor insulation ( )
Replacement of compressor
(Motor damaged)
Drop of power voltage.
Check capacitor.
Replacement.
Only compressor fails to
start.
Defect of compressor
capacitor.
Check of power source.
Check of control switch
setting.

20 Room Air Conditioner
Troubleshooting Guide
YDEMERESUACTNIALPMOC
Check voltage at outlet. Correct if none.
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 5/16 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.
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.
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.
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.
No power
Wire disconnected or
connection loose
Capacitor (Discharge
capacitor before testing.)
Will not rotate
Revolves on overload.
Grommets
Fan
Turbo fan
Loose set screw
Worn bearings
Fan motor will not run.
Fan motor runs
intermittently
Fan motor noise.