Friedrich Air Conditioner US08C10 User Manual

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 1M.  
—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)  

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