LG BWC186MBAB0 User manual

Room Air Conditioner
SERVICE MANUAL
MODEL: BWC186MBAB0 / BWC226NBAB0
(Applied to new Refrigerant R-410A)
CAUTION
- BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
- ONLY FOR AUTHORIZED SERVICE.

—2—
1. PREFACE
1.1 SAFETY PRECAUTIONS ...............................2
1.2 INSULATION RESISTANCE TEST.................2
1.3 SPECIFICATIONS ..........................................3
1.4 FEATURES.....................................................4
1.5 CONTROL LOCATIONS.................................4
2.
DISASSEMBLY INSTRUCTIONS
2.1 MECHANICAL PARTS....................................5
2.1.1 FRONT GRILLE.....................................5
2.1.2 CABINET................................................5
2.1.3 CONTROL BOX.....................................5
2.2 AIR HANDLING PARTS..................................6
2.2.1 COVER (AT THE TOP)..........................6
2.2.2 BLOWER................................................6
2.2.3 FAN........................................................6
2.2.4 SHROUD................................................7
2.3 ELECTRICAL PARTS.....................................7
2.3.1 MOTOR..................................................7
2.3.2 COMPRESSOR.....................................7
2.3.3 CAPACITOR..........................................8
2.3.4 POWER CORD......................................8
2.3.5 THERMOSTAT ......................................8
2.3.6 ROTARY SWITCH.................................9
2.3.7 SYNCHRONOUS MOTOR ....................9
2.4 REFRIGERATION CYCLE.................................10
2.4.1 CONDENSER......................................10
2.4.2 EVAPORATOR....................................10
2.4.3 CAPILLARY TUBE...............................10
3.
TROUBLESHOOTING GUIDE
3.1 OUTSIDE DIMENSIONS...............................13
3.2 PIPING SYSTEM ..........................................13
3.3 TROUBLESHOOTING GUIDE......................14
4. SCHEMATIC DIAGRAM
4.1 CIRCUIT DIAGRAM......................................19
5. EXPLODED VIEW..................................20
6. REPLACEMENT PARTS LIST.......21
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, set the ROTARY SWITCH
or POWER SWITCH to OFF and unplug the power
cord.
2. Observe the original lead dress.
If a short circuit is found, replace all parts which
have been overheated or damaged by the short
circuit.
3. After servicing the unit, make an insulation
resistance test to protect the customer from being
exposed to shock hazards.
1.2 INSULATION RESISTANCE TEST
1. Unplug the power cord and connect a jumper
between 2 pins (black and white).
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 at all the positions
(except OFF or O) of the ROTARY SWITCH.
4. The value should be over 1MΩ.
CONTENTS

—3—
1.3 SPECIFICATIONS
BWC186MBAB0 BWC226NBAB0
POWER SUPPLY 1Ø, 220-240V, 50Hz
COOLING CAPACITY (Btu/h) 18,000 21,000
INPUT (W) 2,250 2,730
RUNNING CURRENT (A) 10.1 12.5
REFRIGERANT (R-410A) CHARGE (g) 780 780
INDOOR (°C) 27(DB) 19(WB)
OUTDOOR (°C) 35(DB) 24(WB)
EVAPORATOR 2 ROW 15 STACKS 3ROW 15 STACKS
CONDENSER 2 ROW 19 STACKS
FAN, INDOOR TURBO FAN
FAN, OUTDO PROPELLER TYPE FAN WITH SLINGER-RING
FAN SPEEDS, FAN/COOLING 2/3
FAN MOTOR 6 POLES
OPERATION CONTROL ROTARY SWITCH
ROOM TEMP. CONTROL THERMOSTAT
VERTICAL LOUVER(RIGHT & LEFT)
HORIZONTAL LOUVER(UP & DOWN)
CONSTRUCTION SLIDE IN-OUT CHASSIS
COMPRESSOR INTERNAL OVERLOAD PROTECTOR
FAN MOTOR INTERNAL THERMAL PROTECTOR
1.5m (3 WIRE WITH GROUNDING)
ATTACHMENT PLUG(CORD-CONNECTED TYPE)
DRAIN SYSTEM DRAIN PIPE OR SPLASHED BY FAN SLINGER
NET WEIGHT (lbs/kg) 130/ 59 152/ 69
OUTSIDE DIMENSION (inch) 26 x 1627/32 x 269/16 26 x 1627/32 x 305/16
(W x H x D) (mm) 660 x 428 x 675 660 x 428 x 770
MODELS
ITEMS
AIR DIRECTION CONTROL
PROTECTOR
POWER CORD
OPERATING
TEMPERATURE
SPEC. AT 230V

1.4 FEATURES
• Designed for cooling only.
• Powerful and quiet cooling.
• Slide-in and slide-out chassis for the simple
installation and service.
1.5 CONTROL LOCATIONS
• VENTILATION
The ventilation lever must be in the CLOSE position
in order to maintain the best cooling conditions.
When a fresh air is necessary in the room, set the
ventilation lever to the OPEN position.
The damper is opened and room air is exhausted.
NOTE: Before using the ventilation feature,
make the lever, as shown. First, pull down
part to horizontal line with part .
• THERMOSTAT
Thermostat will automatically control the
temperature of the room. Select the higher number
for the lower temperature of the room. The
temperature is selected by positioning the knob to
the desired position.
The 5or 6position(middle position) is a normal
setting for average conditions.
• OPERATION
OFF ( ) : Turns the air conditioner off.
MED FAN ( ) : Permits the medium fan speed
operation without cooling.
LOW FAN ( ) : Permits the low fan speed
operation without cooling.
HIGH COOL ( ) : Permits cooling with the
high fan speed operation.
MED COOL ( ) : Permits cooling with the
medium fan speed
operation.
LOW COOL ( ) : Permits cooling with the low
fan speed operation.
• AUTO SWING
ON ( ): Air swing is operated while OPERATION
knob is set to the COOL position.
OFF ( ): Stops the operation of air swing.
• Side air-intake, side cooled-air discharge.
• Built in adjustable THERMOSTAT.
• Washable one-touch filter.
• Compact size.
—4—
Part A
Part B
VENTCLOSE OPEN
0
6
7
8
9
5
1
2
Off On
Med
Fan
Off
Low
Fan
High
Cool
Med
Cool
Low Cool
Auto Swing
3
4
Thermostat Operation
0

—5—
2.1 MECHANICAL PARTS
2.1.1 FRONT GRILLE
1. Open the inlet grille upward.
2. Remove the screw which fastens the front grille.
3. Pull the front grille from the right side.
4. Remove the front grille. (See figure 1)
5.Re-install the component by referring to the
removal procedure.
2.1.2 CABINET
1. After disassembling the FRONT GRILLE, remove
the screws which fasten the cabinet at both sides.
2. Remove the two screws which fasten the cabinet
at back. (See figure 2)
3. Pull the base pan forward.
2.1.3 CONTROL BOX
1. Remove the front grille. (Refer to section 2.1.1)
2. Pull the base pan forward so that you can remove
the 2 screws which fasten the cover control at the
right side. (See figure 3)
3. Remove the 3 screws which fasten the control
box. (See figure 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 figure 3)
(Refer to the circuit diagram found on page 19 in
this manual and on the control box.)
2. DISASSEMBLY INSTRUCTIONS
—Before the following disassembly, POWER SWITCH is set to OFF and disconnected the power cord.
Figure 1
Figure 2
Figure 3

—6—
2.2 AIR HANDLING PARTS
2.2.1 COVER (AT THE TOP)
1. Remove the front grille. (Refer to section 2.1.1)
2. Remove the cabinet. (Refer to section 2.1.2)
3. Remove 11 screws which fasten the brace and
covers.
4. Remove the covers and the brace. (See figure 4)
5. Re-install the components by referring to the
removal procedure, above.
2.2.2 BLOWER
1. Remove the cover. (Refer to section 2.2.1)
2. Remove the 3 screws which fasten the evaporator
at the left side and the top side.
3. Move the evaporator sideward carefully.
4. Remove the orifice from the air guide carefully.
5. Remove the clamp which secures the blower with
plier. (See figure 5)
6. Remove the blower with plier or your hand without
touching blades. (See figure 6)
7. Re-install the components by referring to the
removal procedure, above.
2.2.3 FAN
1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the brace and shroud cover.
(Refer to section 2.2.1)
3. Remove the 5 screws which fasten the condenser.
4. Move the condenser sideways carefully.
5. Remove the clamp which secures the fan.
6. Remove the fan. (See figure 7)
7. Re-install the components by referring to the
removal procedure, above.
Figure 4
Figure 5
Figure 6
Figure 7

—7—
2.2.4 SHROUD
1. Remove the fan. (Refer to section 2.2.3)
2. Remove the 2 screws which fasten the shroud.
3. Remove the shroud. (See figure 8)
4. Re-install the component by referring to the
removal procedure, above.
2.3 ELECTRICAL PARTS
2.3.1 MOTOR
1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the cover control and disconnect a wire
housing in control box. (Refer to section 2.1.3)
3. Remove the blower. (Refer to section 2.2.2)
4. Remove the fan. (Refer to section 2.2.3)
5. Remove the 4 screws which fasten the motor.
(See figure 9)
6. Remove the motor.
7. Re-install the components by referring to the
removal procedure, above.
2.3.2 COMPRESSOR
1. Remove the cabinet. (Refer to section 2.1.2)
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, unbrace the
suction and discharge tubes at the compressor
connections.
5. Remove the 3 nuts and the 3 washers which
fasten the compressor.
6. Remove the compressor. (See figure 10)
7. Re-instill the components by referring to the
removal procedure, above.
Figure 8
Figure 9
Figure 10

—8—
2.3.3 CAPACITOR
1. Remove the control box. (Refer to section 2.1.3)
2. Remove the screw and knobs which fasten the
display panel.
3. Disconnect the 2 leads from the rocker switch and
remove the panel.
4. Remove a screw and unfold the control box.
(See figure 11)
5. Remove the screw and the clamp which fastens
the capacitor. (See figure 11)
6. Disconnect all the leads of capacitor terminals.
7. Re-install the components by referring to the
removal procedure, above.
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 control
box.
4. Disconnect 2 receptacles.
5. Remove a screw which fastens the clip cord.
6. Pull the power cord. (See figure 12)
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
fitted to the unit.)
2.3.5 THERMOSTAT
1. Remove the control box. (Refer to section 2.1.3)
2. Unfold the control box. (Refer to section 2.3.3)
3. Remove the 2 screws which fasten the thermostat.
4. Disconnect all the leads of thermostat terminals.
5. Remove the thermostat. (See figure 13)
6. Re-install the components by referring to the
removal procedure, above.
Figure 12
Figure 11
Figure 13

2.3.6 ROTARY SWITCH
1. Remove the control box. (Refer to section 2.1.3)
2. Unfold the control box. (Refer to section 2.3.3)
3. Remove 2 screws which fasten the rotary switch.
4. Disconnect all the leads of the rotary switch
terminals.
5. Remove the rotary switch. (See figure 14)
6. Re-install the components by referring to the
above removal procedure, above.
2.3.7 SYNCHRONOUS MOTOR
1. Remove the control box. (Refer to section 2.1.3)
2. Unfold the control box. (Refer to section 2.3.3)
3. Remove the crankshaft.
4. Disconnect all the leads of the synchronous
motor.
5. Remove the 2 screws which fasten the
synchronous motor. (See figure 15)
6. Re-install the components by referring to the
removal procedure, above.
—9—
Figure 15
Figure 14

—10—
2.4 REFRIGERATION CYCLE
2.4.1 CONDENSER
1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the brace and the shroud cover.
(Refer to section 2.2.1)
3. Remove 6 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 figure 16)
2.4.2 EVAPORATOR
1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the top cover and the brace.
(Refer to section 2.2.1)
3. Discharge the refrigerant completely.
4. Remove the 3 screws which fasten the evaporator
at the left side and the top side.
5. Move the evaporator sideward carefully and then
unbraze the interconnecting tube at the evaporator
connectors.
6. Remove the evaporator.
7. Re-install the components by referring to notes.
(See figure 17)
2.4.3 CAPILLARY TUBE
1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the brace. (Refer to section 2.2.1)
3. After discharging the refrigerant completely,
unbraze the interconnecting tube at the capillary
tube.
4. Remove the capillary tube.
5. Re-install the components by referring to notes.
Figure 16
Figure 17
•This unit is charged with R-410A, pay attention not to charge R-22.
CAUTION

—11—
—Replacement of the refrigeration cycle.
1. When replacing the refrigeration cycle, be sure to
discharge the refrigerant 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 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.
1) Connect the vacuum pump, as illustrated figure
18A.
2) Start the vacuum pump, slowly open manifold
valves A and B with two full turns counterclockwise
and leave the valves open.
The vacuum pump is now pulling through valves A
and B by means of the manifold.
3) Operate the vacuum pump for 20 to 30 minutes,
until 600 microns of vaccum 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 figure 18B.
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 figure
18B.
With valve C open, discharge the hose at the
manifold connection.
3) Open valve A and allow the proper charge to
enter the system. Valve B is still closed.
4) If more charge is required, the high-side will not
take it. Close valve A.
5) With the unit running, open valve B and add the
balance of the charge.
a. Do not add the liquid refrigerant to the Low-side.
b. Watch the Low-side gauge; The pressure of
optimum condition is as below.(Cooling)
NOTE: If the actual pressure are higher than
shown, the system is most likely over-
charged, and charge should be removed.
If the actual pressure are lower than
shown, the system is most likely
undercharged, and charge should be
added.
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 sold
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.
NOTES
•Use vacuum pump equipped with check valve
applied to be prevented from flowing backward.
•If high vacuum equipment is used, open slowly
with the two full turns counterclockwise. This will
keep oil from foaming and being drawn into the
vacuum pump.
Do not use the existing charge set for R-22.
It is necessary to use new charge set for R-410A.
The pressure of R-410A is 1.6 times higher than
that of R-22. Thus, the high pressure side gauge of
charge set should be used higher pressure gauge
of 50kg/cm2range.
CAUTION
CAUTION
OUTSIDE TEMPERATURE THE PRESSURE OF LOW-SIDE GAUGE
35°C(95°F) 9.2~9.7 kgf/cm2.G
(130.9~138.0 lbf/in2.G)

—12—
A
COMPOUND GAUGE
EVAPORATOR
(LOW PRESSURE SIDE)
COMPRESSOR
CAPILLARY TUBE
CONDENSER
(HIGH PRESSURE SIDE)
SEE INSETS
BELOW
Fitting: UNF 1/2-20
MANIFOLD
GAUGE
B
Equipment needed: •The tools must be used according to the type of refrigerant. Never use the gauge manifold,
charge hose, charge cylinder or vacuum pump with other refrigerants. Always carry out the
work with dedicated tools.
•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.
A
CHARGING
CYLINDER
LOW HI
B
C
A
B
EXTERNAL
VACUUM PUMP
Fitting: UNF 1/2-20
Figure 18A-Pulling Vacuum Figure 18B-Charging
CAUTION
Use vacuum pump equipped with check valve
applied to be prevented from flowing backward.

—13—
3. TROUBLESHOOTING GUIDE
3.1 OUTSIDE DIMENSIONS
675(770) 660
428
CAPILLARY TUBE
DRIER
COMPRESSOR
BLOWER
EVAPORATOR COIL
CONDENSER COIL
FAN
MOTOR
MUFFLER MUFFLER
: REFRIGERANT FLOW
3.2 PIPING SYSTEM
Following is a brief description of the important components and their functions in the refrigeration system.
Refer to figure 19 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
DRIER
ROOM AIR CONDITIONER
EVAPORATOR COILS CONDENSER COILS
CYCLE OF REFRIGERATION
Figure 19

—14—
3.3 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 runs but poor cooling
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 ; 7~10°C
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.

—15—
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.

—16——16—
COMPLAINT CAUSE REMEDY
Check voltage at outlet. Correct if none.
Check voltage to rotary switch. If none, check
power supply cord. Replace cord if circuit is open.
Check switch continuity. Refer to wiring diagram
for terminal identification. Replace switch if
defective.
Connect wire. Refer to wiring diagram for terminal
identification. Repair or replace loose terminal.
Test capacitor.
Replace if not within ±10% of manufacturer's
rating. Replace if shorted, open, or damaged.
Fan blade hitting shroud or blower wheel hitting
scroll. Realign assembly.
Units using slinger ring condenser fans must
have 1/4to 5/16 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
Power supply cord
Rotary switch
Wire disconnected or
connection loose
Capacitor (Discharge
capacitor before testing.)
Will not rotate
Revolves on overload.
Grommets
Fan
Blower
Loose set screw
Worn bearings
Fan motor will not run.
Fan motor runs
intermittently
Fan motor noise.

—17—
COMPLAINT CAUSE REMEDY
Check voltage. See the limits on the preceding.
page. If not within limits, call an electrician.
Check the wire connections, if loose, repair or
replace the terminal. If wires are off, refer to wiring
diagram for identification, and replace. Check wire
locations. If not per wiring diagram, correct.
Check for continuity, refer to the wiring diagram
for terminal identification. Replace the switch if
circuit is open.
Check the position of knob If not at the coldest
setting, advance the knob to this setting and
restart unit.
Check continuity of the thermostat. Replace
thermostat if circuit is open.
Check the capacitor.
Replace if not within ±10% of manufacturers
rating. Replace if shorted, open, or damaged.
Check the compressor for open circuit or
ground. If open or grounded, replace the
compressor.
Check the compressor overload, if externally
mounted. Replace if open. (If the compressor
temperature is high, remove the overload, cool it,
and retest.)
Check the voltage. See the limits on the preced-
ing page. If not within limits, call an electrician.
Check overload, if externally mounted.
Replace if open. (If the compressor temperature
is high, remove the overload, cool, and retest.)
If not running, determine the cause. Replace if
required.
Remove the cabinet. inspect the interior surface
of the condenser; if restricted, clean carefully
with a vacuum cleaner (do not damage fins) or
brush. Clean the interior base before
reassembling.
If condenser fins are closed over a large area
on the coil surface, head pressures will increase,
causing the compressor to cycle. Straighten the
fins or replace the coil.
Voltage
Wiring
Rotary
Thermostat
Capacitor (Discharge
capacitor before
servicing.)
Compressor
Overload
Voltage
Overload
Fan motor
Condenser air flow
restriction
Condenser fins
(damaged)
Compressor will not run,
but fan motor runs.
Compressor cycles
on overload.
Compressor cycles on
overload (Cont'd)

—18—
COMPLAINT CAUSE REMEDY
Test capacitor.
Check the terminals. If loose, repair or replace.
Check the system for a restriction.
If restricted, clean of replace.
Close if open.
Determine if the unit is properly sized for the area to
be cooled.
Check the set screw or clamp. If loose or missing,
correct. If the blower or fan is hitting air guide,
rearrange the air handling parts.
Remove the cabinet and carefully rearrange tubing
not to contact cabinet, compressor, shroud, and
barrier.
Set the knob to HIGH COOL or LOW COOL while
rocker switch is ON.
Check terminals. If loose, repair or replace.
Check the synchronous motor for open circuit.
Capacitor
Wiring
Refrigerating system
Air filter
Exhaust damper door
Unit undersized
Blower or fan
Copper tubing
Rotary switch.
Wiring
Synchronous motor.
Insufficient cooling or
heating
Excessive noise.
Auto air-swing fails.

—19—
4. SCHEMATIC DIAGRAM
4.1 CIRCUIT DIAGRAM
POWER CORD
ROTARY SWITCH
FAN MOTOR
CAPACITOR
THERMOSTAT
COMPRESSOR
1
2
3
4
5
6
1
1
1
1
1
1
LOCATION NO. DESCRIPTION
REMARKS
Q'TY PER SET
1
3
4
2
6
5
WIRING DIACRAM
ROCKER SWITCH
WH
WH
SYNC. M.
POWER INPUT
WH(BL)BK(BR) (Ribbed)
(Plain)

—20—
5. EXPLODED VIEW
349480
W48602
559012
152302
135313
147581-1
147581-2
135312
552102
W52106
W52106
554031
148000
352390
349600
346811
130410
354210
147582
349001
249950
W48602
559010
149980
550140
554160
352113
35211A
269310
W0CZZ
135500
146812
266003
264110
137215
149410
266002
130910
135515