Uni- Fit R
Thru-the-Wall Series
Service and Parts
Manual
Thru-the-Wall Series
115 Volts US08C10 US10C10 US12C10
230 Volts US10C30 US12C30 US14C30
Unifit Cool Svc Parts 2010 (05/10)
Unifit. Cool (03/07)
CONTENTS
2.4 REFRIGERATION CYCLE.................................14
1. PREFACE
2.4.1 CONDENSER ......................................14
2.4.2 EVAPORATOR ....................................14
2.4.3 CAPILLARY TUBE...............................14
1.1 SAFETY PRECAUTIONS ...............................2
1.2 INSULATION RESISTANCE TEST.................2
1.3 SPECIFICATIONS ..........................................3~8
1.4 FEATURES.....................................................9
1.5 CONTROL LOCATIONS.................................9
3. TROUBLESHOOTING GUIDE
3.1 OUTSIDE DIMENSIONS...............................17
3.2 PIPING SYSTEM ..........................................17
3.3 TROUBLESHOOTING GUIDE......................18
2. DISASSEMBLY INSTRUCTIONS
2.1 MECHANICAL PARTS....................................10
2.1.1 FRONT GRILLE.....................................10
2.1.2 CABINET................................................10
2.1.3 CONTROL BOX.....................................10
2.2 AIR HANDLING PARTS..................................11
2.2.1 ORIFICE, HEATER ASSY AND TURBO FAN .........11
2.2.2 FAN........................................................11
2.2.3 SHROUD................................................12
2.3 ELECTRICAL PARTS.....................................12
2.3.1 MOTOR..................................................12
2.3.2 COMPRESSOR .....................................12
2.3.3 CAPACITOR ..........................................12
2.3.4 POWER CORD......................................13
2.3.5 THERMISTOR .......................................13
4. SCHEMATIC DIAGRAM
4.1 CIRCUIT DIAGRAM......................................23
5. EXPLODED VIEW..................................24
6. REPLACEMENT PARTS LIST .......25~30
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.
1.1 SAFETY PRECAUTIONS
1. When servicing the unit, turn off the air conditioner
and unplug the power cord.
1.2 INSULATION RESISTANCE TEST
1. Unplug the power cord and connect a jumper
between 2 pins (black and white).
2. Observe the original lead dress.
2. The grounding conductor (green or green & yellow)
is to be open.
3. Measure the resistance value with an ohm meter
between the jumpered lead and each exposed
metallic part on the equipment.
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.
4. The value should be over 1MΩ.
—2—
1.3 SPECIFICATIONS
MODELS
REMARK
US08C10
ITEMS
POWER SUPPLY
1Ø, 115V, 60Hz
COOLING CAPACITY (Btu/h)
8,000
INPUT
(W)
830
RUNNING CURRENT (A)
7.5
9.6
E.E.R
(Btu/w.h)
REFRIGERANT (R410A) CHARGE
400g(14.1OZ)
OPERATING
INDOOR (°F)
80(DB) 67(WB)
TEMPERATURE
EVAPORATOR
CONDENSER
FAN, INDOOR
FAN, OUTDOOR
OUTDOOR (°F)
95(DB) 75(WB)
2 ROW 12STACKS
5 2ROW 18STACKS, L-BENDING TYPE
TURBO FAN
Ø
LOUVERED-FIN TYPE
PROPELLER TYPE FAN WITH SLINGER-RING
FAN SPEEDS, FAN/COOLING
FAN MOTOR
3/3
6 POLES
OPERATION CONTROL
ROOM TEMP. CONTROL
AIR DIRECTION CONTROL
ELECTRIC
THERMISTOR
VERTICAL LOUVER(RIGHT & LEFT)
HORIZONTAL LOUVER(UP & DOWN)
TOP-DOWN
CONSTRUCTION
PROTECTOR
COMPRESSOR
FAN MOTOR
EXTERNAL OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
3WIRES WITH GROUNDING
ATTACHMENT PLUG(CORD-CONNECTED TYPE, LCDI)
SPLASHED BY FAN SLINGER
73/33
POWER CORD
DRAIN SYSTEM
NET WEIGHT
(lbs/kg)
DIMENSION
(inch)
24 x 1413/32 x 20 3/32
(W x H x D)
(mm)
(inch)
(mm)
(inch)
(mm)
610 x 366 x 499
SLEEVE DIMESION
(W x H x D)
25 7/8 x 15 17/32 x 16 23/32
656 x 394 x 425
OPTIONAL
PART
SLEEVE DEPTH
WITH FRONT GRILLE
20 1/2
521
—3—
1.3 SPECIFICATIONS
MODELS
REMARK
US10C10
ITEMS
POWER SUPPLY
1Ø, 115V, 60Hz
COOLING CAPACITY (Btu/h)
9,800
INPUT
(W)
1,040
9.6
RUNNING CURRENT (A)
E.E.R
(Btu/w.h)
9.4
REFRIGERANT (R-410A) CHARGE
445g(15.7OZ)
OPERATING
INDOOR (°F)
80 (DB) 67(WB)
95(DB) 75 (WB)
2 ROW 12STACKS
3ROW 18STACKS, L-BENDING TYPE
TURBO FAN
TEMPERATURE
EVAPORATOR
CONDENSER
FAN, INDOOR
FAN, OUTDOOR
OUTDOOR (°F)
Ø5.0
LOUVERED-FIN TYPE
PROPELLER TYPE FAN WITH SLINGER-RING
FAN SPEEDS, FAN/COOLING
FAN MOTOR
3/3
6 POLES
OPERATION CONTROL
ROOM TEMP. CONTROL
AIR DIRECTION CONTROL
ELECTRIC
THERMISTOR
VERTICAL LOUVER(RIGHT & LEFT)
HORIZONTAL LOUVER(UP & DOWN)
TOP-DOWN
CONSTRUCTION
PROTECTOR
COMPRESSOR
FAN MOTOR
EXTERNAL OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
3WIRES WITH GROUNDING
ATTACHMENT PLUG(CORD-CONNECTED TYPE, LCDI)
SPLASHED BY FAN SLINGER
73/33
POWER CORD
DRAIN SYSTEM
NET WEIGHT
(lbs/kg)
DIMENSION
(inch)
24 x 1413/32 x 20 3/32
(W x H x D)
(mm)
(inch)
(mm)
(inch)
(mm)
610 x 366 x 499
SLEEVE DIMESION
(W x H x D)
25 7/8 x 15 17/32 x 16 23/32
656 x 394 x 425
OPTIONAL
PART
SLEEVE DEPTH
WITH FRONT GRILLE
20 1/2
521
—4—
MODELS
REMARK
US10C30
ITEMS
1Ø, 230V/208V, 60Hz
POWER SUPPLY
10,000/9,800
1060/1040
4.7/5.2
COOLING CAPACITY (Btu/h)
INPUT (W)
RUNNING CURRENT (A)
E.E.R
(Btu/w.h)
9.4/9.4
REFRIGERANT (R410A) CHARGE
460g(16.2 OZ)
80(DB) 67(WB)
OPERATING
INDOOR (°F)
95(DB) 75(WB)
TEMPERATURE
EVAPORATOR
CONDENSER
FAN, INDOOR
FAN, OUTDOOR
OUTDOOR (°F)
2 ROW 12STACKS
5.0 3ROW 18STACKS, L-BENDING TYPE
TURBO FAN
LOUVERED-FIN TYPE
Ø
PROPELLER TYPE FAN WITH SLINGER-RING
FAN SPEEDS, FAN/COOLING
FAN MOTOR
3/3
6 POLES
OPERATION CONTROL
ROOM TEMP. CONTROL
AIR DIRECTION CONTROL
ELECTRIC
THERMISTOR
VERTICAL LOUVER(RIGHT & LEFT)
HORIZONTAL LOUVER(UP & DOWN)
TOP-DOWN
CONSTRUCTION
PROTECTOR
COMPRESSOR
FAN MOTOR
EXTERNAL OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
3WIRES WITH GROUNDING
ATTACHMENT PLUG(CORD-CONNECTED TYPE, LCDI)
SPLASHED BY FAN SLINGER
73/33
POWER CORD
DRAIN SYSTEM
NET WEIGHT
(lbs/kg)
DIMENSION
(inch)
24 x 1413/32 x 20 3/32
(W x H x D)
(mm)
(inch)
(mm)
(inch)
(mm)
610 x 366 x 499
SLEEVE DIMESION
(W x H x D)
25 7/8 x 15 17/32 x 16 23/32
656 x 394 x 425
OPTIONAL
PART
SLEEVE DEPTH
WITH FRONT GRILLE
20 1/2
521
—5—
MODELS
REMARK
US12C10
ITEMS
POWER SUPPLY
1Ø, 230V/208V, 60Hz
COOLING CAPACITY (Btu/h)
INPUT (W)
RUNNING CURRENT (A)
11500/11200
1220/1190
5.6/6.0
E.E.R
(Btu/w.h)
9.4/9.4
525g(18.0 OZ)
REFRIGERANT (R-410A) CHARGE
OPERATING
INDOOR (°F)
80(DB) 67(WB)
TEMPERATURE
EVAPORATOR
CONDENSER
FAN, INDOOR
FAN, OUTDOOR
OUTDOOR (°F)
95(DB) 75(WB)
2 ROW 12STACKS
LOUVERED-FIN TYPE
3ROW 18STACKS, L-BENDING TYPE, 1 ROW
TURBO FAN
PROPELLER TYPE FAN WITH SLINGER-RING
3/3
FAN SPEEDS, FAN/COOLING
FAN MOTOR
6 POLES
OPERATION CONTROL
ROOM TEMP. CONTROL
AIR DIRECTION CONTROL
ELECTRIC
THERMISTOR
VERTICAL LOUVER(RIGHT & LEFT)
HORIZONTAL LOUVER(UP & DOWN)
TOP-DOWN
CONSTRUCTION
PROTECTOR
COMPRESSOR
FAN MOTOR
EXTERNAL OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
3WIRES WITH GROUNDING
ATTACHMENT PLUG(CORD-CONNECTED TYPE, LCDI)
SPLASHED BY FAN SLINGER
73/33
POWER CORD
DRAIN SYSTEM
NET WEIGHT
(lbs/kg)
DIMENSION
(inch)
24 x 1413/32 x 20 3/32
(W x H x D)
(mm)
(inch)
(mm)
(inch)
(mm)
610 x 366 x 499
SLEEVE DIMESION
(W x H x D)
25 7/8 x 15 17/32 x 16 23/32
656 x 394 x 425
OPTIONAL
PART
SLEEVE DEPTH
WITH FRONT GRILLE
20 1/2
521
—6—
MODELS
REMARK
US12C30
ITEMS
POWER SUPPLY
1Ø, 230/208V, 60Hz
COOLING CAPACITY (Btu/h)
INPUT (W)
RUNNING CURRENT (A)
11,500/11,200
1,220/1,190
5.6/6.0
E.E.R
(Btu/w.h)
9.4/9.4
REFRIGERANT (R-410A) CHARGE
510g(18.0OZ)
OPERATING
INDOOR (°F)
80(DB) 67(WB)
95(DB) 75(WB)
TEMPERATURE
EVAPORATOR
CONDENSER
FAN, INDOOR
FAN, OUTDOOR
OUTDOOR (°F)
2 ROW 12STACKS
3ROW 18STACKS, L-BENDING TYPE 1 ROW
TURBO FAN
LOUVERED-FIN TYPE
PROPELLER TYPE FAN WITH SLINGER-RING
3/3
FAN SPEEDS, FAN/COOLING
FAN MOTOR
6 POLES
OPERATION CONTROL
ROOM TEMP. CONTROL
AIR DIRECTION CONTROL
ELECTRIC
THERMISTOR
VERTICAL LOUVER(RIGHT & LEFT)
HORIZONTAL LOUVER(UP & DOWN)
TOP-DOWN
CONSTRUCTION
PROTECTOR
COMPRESSOR
FAN MOTOR
EXTERNAL OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
3WIRES WITH GROUNDING
ATTACHMENT PLUG(CORD-CONNECTED TYPE, LCDI)
SPLASHED BY FAN SLINGER
73/33
POWER CORD
DRAIN SYSTEM
NET WEIGHT
(lbs/kg)
DIMENSION
(inch)
24 x 1413/32 x 20 3/32
(W x H x D)
(mm)
(inch)
(mm)
(inch)
(mm)
610 x 366 x 499
SLEEVE DIMESION
(W x H x D)
25 7/8 x 15 17/32 x 16 23/32
656 x 394 x 425
OPTIONAL
PART
SLEEVE DEPTH
WITH FRONT GRILLE
20 1/2
521
—7—
MODELS
REMARK
US14C30
ITEMS
POWER SUPPLY
1Ø, 230/208V, 60Hz
COOLING CAPACITY (Btu/h)
INPUT (W)
RUNNING CURRENT (A)
13,000/12,600
1,530/1,480
7.0/7.5
E.E.R
(Btu/w.h)
8.5/8.5
REFRIGERANT (R-410A) CHARGE
510g(18.0OZ)
OPERATING
INDOOR (°F)
80(DB) 67(WB)
TEMPERATURE
EVAPORATOR
CONDENSER
FAN, INDOOR
FAN, OUTDOOR
OUTDOOR (°F)
95(DB) 75(WB)
2 ROW 12STACKS
3ROW 18STACKS, L-BENDING TYPE,1ROW
LOUVERED-FIN TYPE
TURBO FAN
PROPELLER TYPE FAN WITH SLINGER-RING
FAN SPEEDS, FAN/COOLING
FAN MOTOR
3/3
6 POLES
OPERATION CONTROL
ROOM TEMP. CONTROL
AIR DIRECTION CONTROL
ELECTRIC
THERMISTOR
VERTICAL LOUVER(RIGHT & LEFT)
HORIZONTAL LOUVER(UP & DOWN)
TOP-DOWN
CONSTRUCTION
PROTECTOR
COMPRESSOR
FAN MOTOR
EXTERNAL OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
3WIRES WITH GROUNDING
ATTACHMENT PLUG(CORD-CONNECTED TYPE, LCDI)
SPLASHED BY FAN SLINGER
73/33
POWER CORD
DRAIN SYSTEM
NET WEIGHT
(lbs/kg)
DIMENSION
(inch)
24 x 1413/32 x 20 3/32
(W x H x D)
(mm)
(inch)
(mm)
(inch)
(mm)
610 x 366 x 499
SLEEVE DIMESION
(W x H x D)
25 7/8 x 15 17/32 x 16 23/32
656 x 394 x 425
OPTIONAL
PART
SLEEVE DEPTH
WITH FRONT GRILLE
20 1/2
521
—8—
1.4 FEATURES
• Designed for cooling only.
• Built in adjustable THERMOSTAT.
• Washable one-touch filter.
• Compact size.
• Powerful and quiet.
• Slide out chassis for the simple installation and service.
1.5 CONTROL LOCATIONS
1.5.1 COOLING ONLY MODEL
• OPERATION
• 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.
PULL OPEN / PUSH CLOSE
—9—
2. DISASSEMBLY INSTRUCTIONS
— 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.
Figure 2
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)
Figure 3
(Refer to the circuit diagram found on page 19 in
this manual and on the control box.)
—10—
2.2 AIR HANDLING PARTS
2.2.1 ORIFICE, AND TURBO FAN
1. Remove the front grille. (Refer to section 2.1.1)
2. Remove the cabinet. (Refer to section 2.1.2)
3. Remove the 2 screws which fasten the
evaporator at the left side and the right side.
(See Fig. 4)
4. Move the evaporator to the side carefully.
Figure 4
5. Remove the orifice. (See Fig. 5)
Figure 5
8. Using handheld pliers, remove the clamp which
secures the turbo fan. (See Fig. 6)
Figure 6
9. Remove the turbo fan with pliers or your hand,
without touching blades. (See Fig. 7)
10. Re-install the components by referring to the
removal procedures, above.
Figure 7
2.2.2 FAN
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. Move the condenser to the side carefully.
5. Using handheld pliers, remove the clamp which
secures the fan.
6. Remove the fan. (See Fig. 8)
7. Re-install the components by referring to the
removal procedures, above.
Figure 8
—11—
2.2.3 SHROUD
1. Remove the fan. (Refer to section 2.2.2)
2. Remove the shroud. (See Fig. 9)
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)
Figure 9
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 FreonTM
Recovery System.
Figure 10
Install a valve for recovery before venting the
Freon. Remove the valve when finished.
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.
2.3.3 CAPACITOR
1. Remove the control box. (Refer to section 2.1.3)
Figure 11
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.
Figure 12
—12—
2.3.4 POWER CORD
1. Remove the control box. (Refer to section 2.1.3)
2. Unfold the control box. (Refer to section 2.3.3)
3. Disconnect the grounding screw from the Base
pan.
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 components 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 with the factory-authorized and
specified cord.
Figure 13
2.3.5 ELECTRONIC CONTROL BOARD
1. Remove the control box. (Refer to section 2.1.3)
2. Unfold the control box. (Refer to section 2.3.3)
3. Disconnect all the leads of Electronic control board
terminals.
4. Remove the Electronic control board. (See Fig. 14)
5. Re-install the components by referring to the
removal procedures, above.
Figure 14
—13—
2.4 REFRIGERATION CYCLE
CAUTION
TM
Discharge the refrigerant system using a Freon
Recovery System.
Install a valve for the recovery, before venting
the Freon, remove the valve when finished.
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
FreonTM Recovery System, unbraze the
interconnecting tube at the condenser
connections.
5. Remove the condenser.
6. Re-install the components by referring to the notes
– on pages 11-13. (See Fig. 15)
Figure 15
2.4.2 EVAPORATOR
1. Remove the cabinet. (Refer to section 2.1.2)
2. Discharge the refrigerant completely – into a
FreonTM Recovery System.
3. Remove the 2 screws which fasten the evaporator
at the left side and the right side.
4. Move the evaporator to the side 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
– on pages 11-13. (See Fig. 16)
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 FreonTM Recovery System, unbraze the
interconnecting tube at the capillary tube.
3. Remove the capillary tube.
4. Re-install the components by referring to the notes
– on page 11-13.
—14—
NOTES
— Replacement of the refrigeration cycle.
1. When replacing refrigeration components, be sure
to discharge the refrigerant system using a FreonTM
recovery System.
Install a valve for the recovery, before venting the
Freon, remove the valve when finished.
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.
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, and the high-side will
not
1) Connect the vacuum pump, as illustrated Fig.
17A.
take it. Close valve A.
2) Start the vacuum pump, slowly open manifold
valves A and B with two full turns
5) With the unit running, open valve B and add the
balance of the charge.
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.
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.
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.
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 for leakage add the
pinch-off connection.
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.
—15—
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 17A-Pulling Vacuum
Figure 17B-Charging
—16—
3. TROUBLESHOOTING GUIDE
3.1 OUTSIDE DIMENSIONS
20-3/32"
24"
(610mm)
(499mm)
3.2 PIPING SYSTEM
CONDENSER COILS
FAN
CAPILLARY TUBE
COMPRESSOR
MOTOR
TURBO FAN
EVAPORATOR COILS
: REFRIGERANT FLOW
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.
ROOM AIR CONDITIONER
CYCLE OF REFRIGERATION
EVAPORATOR COILS
CONDENSER COILS
VAPOR INLET
SUCTION LINE
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 REFRIGERANT
LOW PRESSURE VAPOR
CAPILLARY TUBE
Figure 18
—17—
3.3 TROUBLESHOOTING GUIDE
In general, possible trouble is classified in two causes.
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/or improper application.
Unit is running but cooling is ineffective
Ineffective Cooling
Check cold air circulation
for smooth flow.
Check 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
Clogged air filter
Check inside gas pressure.
Replacement of unit if the
unit is beyond repair.
Obstruction at air outlet
Adjusting of refrigerant
charge
Correct above troubles
Malfunction of compressor
Check for a clog in
refrigeration circuit.
Replacement of
compressor
Satisfactory operation with
temperature difference of
inlet & outlet air ; 18-26°F
Repair for a clog in
refrigeration circuit.
—18—
Fails to Start
Check power source.
Check circuit breaker
and fuse.
Check control switch
setting.
Check control board
Only compressor fails to
start.
Only fan fails to start.
Improper wiring.
Drop in power voltage.
Improper thermostat setting
Defect of fan motor
capacitor.
Defective 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)
—19—
COMPLAINT
CAUSE
REMEDY
Fan motor will not run.
No power
Check voltage at outlet. Correct if none.
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 blower wheel 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
Cycles on overload.
Check voltage. See limits on page 17. 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.
—20—
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.
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
126.5V
253V
115V
103.5V
187V
208/230V
—21—
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
(do not damage fins). 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 or 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.
Blower or 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.
Remove the cabinet and carefully rearrange tubing
not to contact cabinet, compressor, shroud, and
barrier.
—22—
4. SCHEMATIC DIAGRAM
4.1 CIRCUIT DIAGRAM
WIRING DIAGRAM
(SMPS)
250V/T2A
(250V/T3.15A)
MEZ62420710
—23—
Exploded View
Exploded View
132100
C
152302
147581
147582-1
135303
147582-2
131400
149980
135312
346811
359012
W48602
559011
349480
435301
435300
352380
731273
130410
267110
A
264110
268711-2
567480
249950
B
567502
268711-1
C
o
o
l
E
S
n
a
e
r
e
g
r
y
v
F
a
n
F
2
1
L
F
O
W
D
H
M
F
E
IG
3
H
T
i
m
e
'
r
F
MO
D
E
T
E
M
P
W0CZZ
T
I
M
E
R
F
E
A
E
S
N
D
P
P
O
W
E
R
550140
238310 237200
—24—
LocNo
Description
US08C10
W0CZZ
130410
130900
132100
135303
135312
238310
W48602
346811
147581
147582-1
CAPACITOR,FILM,BOX
BASE ASSEMBLY,SINGLE
CABINET
67300709
67302925
67303717
67308102
67306106
67306012
67500114
67302500
67303021
67306205
67306256
FRAME
GRILLE,INLET
GRILLE ASSEMBLY,FRONT(SINGLE)
ESCUTCHEON
CLAMP,SPRING
MOTOR ASSEMBLY,SINGLE
LOUVER,HORIZONTAL
LOUVER,VERTICAL
147582-2
149980
LOUVER,VERTICAL
SHROUD
67306257
67500112
550140
152302
352380
359012
559011
567480
264110
267110
567502
268711-2
268711-1
435300
237200
731273
249950
435301
349480
DAMPER,COMPRESSOR
FILTER,AIR
67305000
67500113
67302739
67302607
67303202
67307804
67300027
67302239
67301907
67307620
67307619
67304801
67305510
67306311
67305521
67304801
67303409
AIR GUIDE
FAN,TURBO
FAN ASSEMBLY,AXIAL
THERMISTOR ASSEMBLY
POWER CORD ASSEMBLY
REMOTE CONTROLLER ASSEMBLY
OverloadProtect
PWB(PCB) ASSEMBLY,MAIN
PWB(PCB) ASSEMBLY,DISPLAY
GRILLE,REAR
PANEL,CONTROL
INSTALL PART ASSEMBLY,SINGLE
CASE ASSEMBLY,CONTROL
GRILLE,REAR
ORIFICE
—25—
LocNo
Description
US10C10
W0CZZ
130410
130900
132100
135303
135312
238310
W48602
346811
147581
147582-1
147582-2
349600
149980
550140
152302
352380
359012
559011
567480
264110
267110
567502
268711-2
268711-1
435300
237200
731273
249950
435301
349480
CAPACITOR,FILM,BOX
BASE ASSEMBLY,SINGLE
CABINET
67300724
67305520
67303717
67308102
67306106
67306012
67500114
67302500
67303023
67306205
67306256
67306257
67303606
67500112
67305000
67500113
67302741
67302607
67303202
67307804
67300027
67302239
67301905
67307620
67307619
67304801
67305510
67306311
67305522
67304801
67303409
FRAME
GRILLE,INLET
GRILLE ASSEMBLY,FRONT(SINGLE)
ESCUTCHEON
CLAMP,SPRING
MOTOR ASSEMBLY,SINGLE
LOUVER,HORIZONTAL
LOUVER,VERTICAL
LOUVER,VERTICAL
BRACKET,MOTOR
SHROUD
DAMPER,COMPRESSOR
FILTER,AIR
AIR GUIDE
FAN,TURBO
FAN ASSEMBLY,AXIAL
THERMISTOR ASSEMBLY
POWER CORD ASSEMBLY
REMOTE CONTROLLER ASSEMBLY
OverloadProtect
PWB(PCB) ASSEMBLY,MAIN
PWB(PCB) ASSEMBLY,DISPLAY
GRILLE,REAR
PANEL,CONTROL
INSTALL PART ASSEMBLY,SINGLE
CASE ASSEMBLY,CONTROL
GRILLE,REAR
ORIFICE
—26—
LocNo
Description
US10C30
W0CZZ
130410
130900
132100
135303
135312
238310
W48602
346811
147581
147582-1
147582-2
149980
CAPACITOR,FILM,BOX
BASE ASSEMBLY,SINGLE
CABINET
67300709
67302925
67303717
67308102
67306106
67306012
67500114
67302500
67303024
67306205
67306256
67306257
67500112
FRAME
GRILLE,INLET
GRILLE ASSEMBLY,FRONT(SINGLE)
ESCUTCHEON
CLAMP,SPRING
MOTOR ASSEMBLY,SINGLE
LOUVER,HORIZONTAL
LOUVER,VERTICAL
LOUVER,VERTICAL
SHROUD
550140
152302
352380
359012
559011
567480
264110
267110
567502
268711-2
268711-1
435300
237200
731273
249950
435301
349480
DAMPER,COMPRESSOR
FILTER,AIR
67305000
67500113
67302740
67302607
67303202
67307804
67300026
67302239
67301908
67307618
67307619
67304801
67305510
67306311
67305523
67304801
67303409
AIR GUIDE
FAN,TURBO
FAN ASSEMBLY,AXIAL
THERMISTOR ASSEMBLY
POWER CORD ASSEMBLY
REMOTE CONTROLLER ASSEMBLY
OverloadProtect
PWB(PCB) ASSEMBLY,MAIN
PWB(PCB) ASSEMBLY,DISPLAY
GRILLE,REAR
PANEL,CONTROL
INSTALL PART ASSEMBLY,SINGLE
CASE ASSEMBLY,CONTROL
GRILLE,REAR
ORIFICE
—27—
LocNo
Description
US12C10
W0CZZ
130410
130900
132100
135303
135312
238310
W48602
346811
147581
147582-1
147582-2
349600
149980
550140
152302
352380
359012
559011
567480
264110
267110
567502
268711-2
268711-1
435300
237200
731273
249950
435301
349480
CAPACITOR,FILM,BOX
BASE ASSEMBLY,SINGLE
CABINET
67300729
67305520
67303717
67308102
67306106
67306012
67500114
67302500
67303023
67306205
67306256
67306257
67303606
67500112
67305000
67500113
67302741
67302607
67303202
67307804
67300025
67302239
67301905
67307620
67307619
67304801
67305510
67306311
67305524
67304801
67303409
FRAME
GRILLE,INLET
GRILLE ASSEMBLY,FRONT(SINGLE)
ESCUTCHEON
CLAMP,SPRING
MOTOR ASSEMBLY,SINGLE
LOUVER,HORIZONTAL
LOUVER,VERTICAL
LOUVER,VERTICAL
BRACKET,MOTOR
SHROUD
DAMPER,COMPRESSOR
FILTER,AIR
AIR GUIDE
FAN,TURBO
FAN ASSEMBLY,AXIAL
THERMISTOR ASSEMBLY
POWER CORD ASSEMBLY
REMOTE CONTROLLER ASSEMBLY
OverloadProtect
PWB(PCB) ASSEMBLY,MAIN
PWB(PCB) ASSEMBLY,DISPLAY
GRILLE,REAR
PANEL,CONTROL
INSTALL PART ASSEMBLY,SINGLE
CASE ASSEMBLY,CONTROL
GRILLE,REAR
ORIFICE
—28—
LocNo·
Description
US12C30
W0CZZ
130410
130900
132100
135303
135312
238310
W48602
346811
147581
147582-1
147582-2
349600
149980
550140
152302
352380
359012
559011
567480
264110
267110
567502
268711-2
268711-1
435300
237200
731273
249950
435301
349480
CAPACITOR,FILM,BOX
BASE ASSEMBLY,SINGLE
CABINET
67300726
67305520
67303717
67308102
67306106
67306012
67500114
67302500
67303037
67306205
67306256
67306257
67303606
67500112
67305000
67500113
67302741
67302607
67303202
67307804
67300026
67302239
67301906
67307618
67307619
67304801
67305510
67306311
67305525
67304801
67303409
FRAME
GRILLE,INLET
GRILLE ASSEMBLY,FRONT(SINGLE)
ESCUTCHEON
CLAMP,SPRING
MOTOR ASSEMBLY,SINGLE
LOUVER,HORIZONTAL
LOUVER,VERTICAL
LOUVER,VERTICAL
BRACKET,MOTOR
SHROUD
DAMPER,COMPRESSOR
FILTER,AIR
AIR GUIDE
FAN,TURBO
FAN ASSEMBLY,AXIAL
THERMISTOR ASSEMBLY
POWER CORD ASSEMBLY
REMOTE CONTROLLER ASSEMBLY
OverloadProtect
PWB(PCB) ASSEMBLY,MAIN
PWB(PCB) ASSEMBLY,DISPLAY
GRILLE,REAR
PANEL,CONTROL
INSTALL PART ASSEMBLY,SINGLE
CASE ASSEMBLY,CONTROL
GRILLE,REAR
ORIFICE
—29—
LocNo·
Description
US14C30
W0CZZ
130410
130900
132100
135303
135312
238310
W48602
346811
147581
147582-1
147582-2
349600
149980
550140
152302
352380
359012
559011
567480
264110
267110
268711-2
268711-1
435300
237200
731273
249950
435301
349480
CAPACITOR,FILM,BOX
BASE ASSEMBLY,SINGLE
CABINET
67300709
67302926
67303717
67308102
67306106
67306012
67500114
67302500
67303037
67306205
67306256
67306257
67303606
67500112
67305000
67500113
67302741
67302607
67303202
67307804
67300026
67302239
67307618
67307619
67304801
67305510
67306311
67305526
67304801
67303409
FRAME
GRILLE,INLET
GRILLE ASSEMBLY,FRONT(SINGLE)
ESCUTCHEON
CLAMP,SPRING
MOTOR ASSEMBLY,SINGLE
LOUVER,HORIZONTAL
LOUVER,VERTICAL
LOUVER,VERTICAL
BRACKET,MOTOR
SHROUD
DAMPER,COMPRESSOR
FILTER,AIR
AIR GUIDE
FAN,TURBO
FAN ASSEMBLY,AXIAL
THERMISTOR ASSEMBLY
POWER CORD ASSEMBLY
REMOTE CONTROLLER ASSEMBLY
PWB(PCB) ASSEMBLY,MAIN
PWB(PCB) ASSEMBLY,DISPLAY
GRILLE,REAR
PANEL,CONTROL
INSTALL PART ASSEMBLY,SINGLE
CASE ASSEMBLY,CONTROL
GRILLE,REAR
ORIFICE
—30—
FRIEDRICH AIR CONDITIONING CO.
Post Office Box 1540 • 4200 N. Pan Am Expressway • San Antonio, Texas 78295-1540
• (210) 357-4400 • FAX (210) 357-4480
P/NO.:3828A20294U
Printed in the U.S.A
Unifit Cool Svc Parts 2010 (05/10)
|