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CAUTION
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
1-1. 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 FEATURES
• DESIGNED FOR COOLING ONLY
• POWERFUL AND INCREDIBLE COOLING
• TOP-DOWN CHASSIS FOR THE SIMPLE INSTALLATION AND SERVICE
• BUILT-IN ADJUSTABLE THERMOSTAT
• WASHABLE ONE-TOUCH FILTER
• COMPACT SIZE
1.2 SPECIFICATIONS
MODELS
RADS-51B
ITEMS
COOLING CAPACITY (BTU/h)
POWER SUPPLY (Phase, V, Hz)
INPUT (W)
5,100
1ø, 115V, 60HZ
475
OPERATING CURRENT (AMP.)
REFRIGERANT CONTROL
REFRIGERANT CHARGE (R-22)
INSIDE FAN
4.4
CAPILLARY TUBE
280g (9.9 oz)
TURBO FAN
OUTSIDE FAN
PROPELLER FAN WITH SLINGER RING
2-WAY (RIGHT AND LEFT)
TOP-DOWN
AIR DISCHARGE
CHASSIS
• OVERLOAD PROTECTOR FOR COMPRESSOR
• INTERNAL PROTECTOR FOR FAN MOTOR
PROTECTOR
TEMPERATURE CONTROL
ROTARY SWITCH
FAN MOTOR
THERMOSTAT
5 STEP (LOW FAN, HIGH FAN, OFF, HIGH COOL, LOW COOL)
6 POLES, 16W
—3—
1.3 LOCATIONS OF CONTROLS
Controls
Temperature Setting
• This button can automatically control the temperature
of the room. The temperature can be set within a range of
60°F to 86°F by 1°F.
Select the lower number for lower temperature of the room.
Energy Saver
The fan stops when the compressor stops cooling.
• Approximately every 3 minutes the fan will turn on and
check the room air to determine if cooling is needed.
Fan/Cool/Dry
• Everytime you push this button, it will toggle between
COOL, FAN, and DRY.
On/Off Timer
- Stopping Operation
Each press of the button cycles through the options in this
order: 1 Hour→2 Hours → 3 Hours→ 4 Hours→ 5 Hours
→6 Hours →7 Hours →8 Hours →9 Hours →10 Hours →
11 Hours →12 Hours →CANCEL.
The set temperature will be raised 2°F after 30 minutes
and again after another 30 minutes.
- Stopping Operation
Each press of the button cycles through the options in this
order: 1 Hour→2 Hours → 3 Hours→ 4 Hours→ 5 Hours
→6 Hours →7 Hours →8 Hours →9 Hours →10 Hours →
11 Hours →12 Hours →CANCEL.
Power
• To turn the unit ON, push the button. To turn the unit OFF,
push the button again.
• This button takes priority over any other buttons.
• When the unit is first powered up, it defaults to settings of
High Cool at 72°F.
Fan Speed
• Pressing the Fan Speed button toggles between Low and
High speeds.
CAUTION : After switching the air conditioner from Cool to Off or Fan, wait at least 3 minutes before switching it
back to Cool.
1.4 SAFETY PRECAUTIONS
1.5 INSULATION RESISTANCE TEST
1. When servicing, set the ROTARY SWITCH to
Off and unplug the power cord.
1. Unplug the power cord and connect a jumper
between 2 pins (black and white).
2. Observe the original lead dress.
If a short circuit is found, replace all parts which
have been overheated or damaged by the short cir-
cuit.
3. After servicing, make an insulation resistance test
to prevent the customer from being exposed to
shock hazards.
2. The grounding conductor (green or green and yel-
low) 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 position
[except Off] of the ROTARY SWITCH.
4. The value should be over 1 MΩ.
—4—
2. DISASSEMBLY INSTRUCTIONS
2.1 MECHANICAL PARTS
2.1.1 FRONT GRILLE
1. Pull the inlet grille forward.
Figure 1
2. Remove the screw securing the Front Grille. (Fig. 3)
3. Push the grille up from the bottom and pull the top of
the grille away from the case to lift the top tabs out of
their slots. (Fig. 4)
4. Carefully position the grille, bottom first, and snap back
into place.
5. Reposition the screw that secures the front grille
Figure 2
2.1.2 CABINET
1. Disconnect the unit from the power source.
2. Remove the front grille. (Refer to section 2.1.1)
3. Remove 9 screws that secure the cabinet to the
base pan and condenser. (See Figure 3)
4. Lift the cabinet from the unit.
5. Re-install by referring to the procedures above.
Figure 3
2.1.3 CONTROL PANEL
2. Remove the front grille. (Refer to Section 2.1.1)
3. Remove the cabinet. (Refer to Section 2.1.2)
4. Remove 1 screws that secure the control board to
base pan and air guide. (See Figure 4)
5. Pull the control panel toward yourself.
NOTE : Controls, wires, and capacitor are now
accessible for servicing. Discharge the
capacitor before servicing. See step
2.3.3 on page 8 for procedures.
Figure 4
the fan motor and compressor. (See Figure 5)
7. Re-install components by referring to procedures
above. (Refer to wiring diagram on page 23 in this
manual or inside control board.)
Figure 5
—5—
Figure 6
2.2 AIR HANDLING PARTS
2.2.1 AIR GUIDE UPPER
1. Disconnect the unit from the power source.
2. Remove the front grille. (Refer to Section 2.1.1)
3. Remove the cabinet. (Refer to Section 2.1.2)
4. Remove the control board.
(Refer to Section 2.1.3)
5. Remove 2 screws that secure the air guide upper
to air guide lower. (See Figure 6)
6. Lift air guide upper upward.
7. Re-install by referring to the procedures above.
Figure 7
2.2.2 ORIFICE, TURBO FAN AND FAN
1. Disconnect the unit from the power source.
2. Remove the front grille. (Refer to Section 2.1.1)
3. Remove the cabinet. (Refer to Section 2.1.2)
4. Remove the control board.
(Refer to Section 2.1.3)
5. Remove the air guide upper.
(Refer to Section 2.2.1)
6. Remove 2 screws that secure the base pan to
condenser. (See Figure 7)
7. Remove screw that secures the shroud to
channel of condenser.
Figure 8
8. Press the snap area of shroud with your thumbs.
This allows you to remove it from the condenser.
9. Lift the compressor upward with the evaporator
and condenser. (See Figure 7)
10. Remove the orfice by pushing the snap area of
the air guide blower. (See Figure 8)
11. Remove the clamp springs which are clamped to
the boss of fan and turbo fan by hand plier. (See
Figure 9)
12. Pull the fan and turbo fan outward.
13. Remove the shroud.
14. Re-install by referring to the procedures above.
Figure 9
—6—
2.2.3 MOTOR
Figure 10
1. Disconnect the unit from the power source.
2. Remove the front grille. (Refer to Section 2.1.1)
3. Remove the cabinet. (Refer to Section 2.1.2)
4. Remove the control board.
(Refer to Section 2.1.3)
5. Remove the air guide upper.
(Refer to Section 2.2.1)
6. Remove the compressor, turbo fan, fan and
shroud. (Refer to Section 2.2.2)
7. Remove 2 screws that secure the motor to the
motor. (See Figure 10)
8. Remove the motor.
9. Re-install by referring to the procedures above.
Figure 11
2.2.4 AIR GUIDE
1. Disconnect the unit from the power source.
2. Remove the front grille. (Refer to Section 2.1.1)
3. Remove the cabinet. (Refer to Section 2.1.2)
4. Remove the control board.
(Refer to Section 2.1.3)
5. Remove the air guide upper.
(Refer to Section 2.2.1)
6. Remove the compressor, turbo fan, fan and
shroud. (Refer to Section 2.2.2)
7. Remove the motor. (Refer to Section 2.2.3)
8. Remove 2 screws that secure the air guide to the
base pan. (See Figure 11)
9. Push the air guide backward and lift it upward.
(See Figure 11)
10. Re-install by referring to the procedures above.
Figure 13
Figure 12
2.3 ELECTRICAL PARTS
2.3.1 OVERLOAD PROTECTOR
1. Remove the front grille and cabinet.
(Refer to Section 2.1)
2. Remove the nut which fastens the terminal cover.
3. Remove the terminal cover.
4. Remove all the leads from the overload protector.
5. Remove the overload protector.
6. Re-install the components by referring to the
removal procedure above.
(See Figure 12 and 13)
—7—
2.3.2 COMPRESSOR
1. Remove the front grille and cabinet.
Figure 14
(Refer to Section 2.1)
2. Discharge the refrigerant by using a refrigerant
recovery system.
3. Remove the overload protector.
(Refer to Section 2.3.1)
4. After discharging the unit completely, unbrace the
suction and discharge pipes at the compressor
connections.
5. Remove 3 nuts which fasten the compressor.
6. Remove the compressor.
7. Re-install by referring to the removal procedure
above. (See Figure 14)
2.3.3 CAPACITOR
1. Remove the cabinet. (Refer to Section 2.1.2)
2. Remove the control panel.
Figure 15
(Refer to Section 2.1.3)
3. Discharge the capacitor by placing a 20 KΩ
resistor across the capacitor terminals.
4. Remove the screw which fastens the capacitor
clamp.
5. Remove all the leads of capacitor terminals.
6. Re-install the components by referring to the
removal procedure above. (See Figure 15)
2.3.4 THERMISTOR
1. Remove the cabinet. (Refer to Section 2.1.2)
2. Remove the control panel.
Figure 16
(Refer to Section 2.1.3)
3. Disconnect the thermistor terminals from main
P.W.B assembly.
4. Remove the thermistor.
5. Re-install the components by referring to the
removal procedure above. (See Figure 16)
Figure 17
2.3.5 CONTROL BOARD
1. Remove the cabinet. (Refer to Section 2.1.2)
2. Remove the control panel.
(Refer to Section 2.1.3)
3. Pull the control board forward and pull out it.
4. Remove 2 lead wire terminals.
5. Re-install the components by referring to the
removal procedure above. (See Figure 17)
—8—
Figure 18
2.3.6 POWER CORD
1. Disconnect the unit from source of power.
2. Remove the front grille. (Refer to Section 2.1.1)
3. Remove the cabinet. (Refer to Section 2.1.2)
4. Remove a screw that secures control board to
base pan. (Refer to Section 2.1.3)
5. Pulls the control board toward you.
6. Disconnect the 2 receptacles and remove the
grounding screw.
7. Remove a screw securing the clip with cord to the
control board.
8. Pull the power cord.
9. Re-install by referring to procedures above.
Figure19
2.4 REFRIGERANT CYCLE
2.4.1 CONDENSER
1. Remove the cabinet. (Refer to Section 2.1.2)
2. Discharge the refrigerant by using a refrigerant
recovery system.
3. Remove the air guide. (Refer to Section 2.2.1)
4. Remove 2 screws which fasten the condenser.
5. After discharging the refrigerant completely,
unbraze the interconnecting tube at the
condenser connections.
6. Remove the condenser.
7. Re-install by referring to the procedures above.
—9—
wise. This will keep oil from foaming and being
drawn into the vacuum pump.
2.4.2 EVAPORATOR
1. Remove the cabinet.
2. Discharge the refrigerant by using a refrigerant
recovery system.
3. Remove the air guide upper. (Refer to Section
2.2.1)
4. After discharging the refrigerant completely,
unbraze the interconnecting tube at the condenser
connections.
6-3. Operate the vacuum pump for 20 to 30 min-
utes, until 600 micron 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.
5. Remove the evaporator.
6. Re-install by referring to the procedures above.
6-4. Remove the hose from the vacuum pump and
place it on the charging cylinder. See figure
23B. Open valve C.
2.4.3 CAPILLARY TUBE
1. Remove the cabinet.
Discharge the line at the manifold connection.
6-5. The system is now ready for final charging.
7. Recharge as follows:
2. Discharge the refrigerant by using a refrigerant
recovery system.
3. Remove the air guide upper. (Refer to Section
2.2.1)
4. After discharging the refrigerant completely,
unbraze the interconnecting tube of the capillary
tube.
5. Remove the capillary tube.
6. Re-install by referring to the procedures above.
7-1. 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 is
installed as the system is opened.
7-2. Connect the charging cylinder as shown in fig-
ure 21B. With valve C open, discharge the
hose at the manifold connection.
NOTES
7-3. Open valve A and allow the proper charge to
enter the system. Valve B is still closed.
7-4. If more charge is required, the high-side will
not take it. Close valve A.
7-5. With the unit running, open valve B and add
the balance of the charge.
Replacement of the refrigeration cycle.
1. When replacing the refrigerating cycle, be sure to
discharge the refrigerant by using a refrigerant
recovery system.
2. After discharging the unit completely, remove the
desired components, 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. After completing the above procedures, the valve
must be closed and left in place on the system for
any subsequent procedures.
a. Do not add the liquid refrigerant to the low-
side.
b. Watch the low-side gauge, allow pressure to
rise to 30 lbs.
c. Turn off valve B and allow the pressure to
drop.
d. Repeat steps b. and c. until the balance of
the charge is in the system.
7-6. When the unit is operating correctly, use the
pinch-off tool with the unit still running and
clamp on the pinch-off tube. Using a tube cut-
ter, cut the pinch-off tube about 2 inches from
the pinch-off tool. Use sil-fos solder and solder
the pinch-off tube closed. Turn off the unit,
allow setting for a while and then test the leak-
age of the pinch-off connection.
6. Evacuate as follows:
6-1. Connect the vacuum pump, as illustrated in
figure 21A.
6-2. Start the vacuum pump. Slowly open manifold
valves A and B with two full turns counter-
clockwise and leave the valves closed.
The vacuum pump is now pulling through
valves A and B up to valve C by means of
manifold and the entire system.
CAUTION : If high vacuum equipment is used,
just crack valves A and B for a few minutes, then
open slowly with the two full turns counterclock-
—10—
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 and service valve.
COMPOUND GAUGE
MANIFOLD
GAUGE
B
A
CONDENSER
(HIGH PRESSURE SIDE)
SEE INSETS
BELOW
COMPRESSOR
EVAPORATOR
(LOW PRESSURE SIDE)
CAPILLARY TUBE
LO
HI CHARGING CYLINDER
A
A
B
B
EXTERNAL VACUUM PUMP
C
Figure 21A-Pulling Vacuum
Figure 21B-Charging
—11—
3. INSTALLATION
This air conditioner is designed with a button-down
chassis so it can be easily installed in a window.
3.1 SELECT THE BEST LOCATION
1. To prevent vibration and noise, make sure the unit is
installed securely and firmly.
2. Install the unit where the sun does not shine directly
on the unit.
INSIDE
OUTSIDE
AWNING
FENCE
3. The outside of the cabinet must extend outward for at
least 10" and there should be no obstacles, such as a
fence or wall, within 20" from the back of the cabinet
because it will prevent heat radiation of the condenser.
Restriction of outside air will greatly reduce the cooling
efficiency of the air conditioner.
COOLED AIR
HEAT
RADIATION
CAUTION
ABOUT 1/4
"
All side louvers of the cabinet must remain
exposed on the outdside of the structure.
Over 20"
Figure 22
4. Install the unit slanted slightly so the back is slight-
1
ly lower than the front (about /4"). This will force
condensed water to the outside.
5. Install the unit with the bottom about 30"~60"
above the floor level.
3.2 HOW TO INSTALL
3.2.1 WINDOW REQUIREMENTS
INNER
SILL
NOTE: All supporting parts should be secured to firm
wood, masonry, or metal.
1. This unit is designed for installation in standard dou-
ble hung windows with actual opening widths of 22" to
36". The upper and lower sash must open sufficiently
to allow a clear vertical opening of 13" from the bot-
tom of the sash to the window stool.
OUTER
SILL
2.If storm window presents interference, fasten a 2" wide
wood strip to the inner window sill across the full
width of the sill. The wood strip should be thick
enough to raise the height of the window sill so that
the unit can be installed without interference by the
storm window frame. See Figure. 24. Top of wood
strip should be approximately 3/4" higher than the
storm window frame (STORM WINDOW FRAME) or
wood strip (OUTDOORS) to help condensation to
drain properly to the outside.
INDOORS
OUTDOORS
Figure 23
1" MAX.
WOOD STRIP MOUNTED
ON TOP OF INNER SILL
3/4"
CLEARANCE
STORM
WINDOW
FRAME
INNER
SILL
3. Install a second wood strip (approximately 6" long by
11/2" wide and same thickness as first strip) in the cen-
ter of the outer sill flush against the back off the inner
sill. This will raise the L bracket as shown Figure. 24.
4. If the distance between STORM WINDOW FRAME
and WOOD STRIP MOUNTED ON TOP OF INNER
SILL is more than 1", two of wood strip are not neces-
sary.
WOOD STRIP
FOR BRACKET
L
OUTER
SILL
INDOORS
OUTDOORS
Figure 24
—12—
Installation
HARDWARE
TYPE A: 11EA
(SHORT SCREW)
TYPE B: 4EA
(WOOD SCREW)
TYPE C: 3EA
BACKET)
(L
TYPE D: 1EA
(SEAL STRIP)
TYPE E: 1EA
(SASH SEAL)
TYPE F: 2EA
(GUIDE PANEL)
(Adhesive backed)
(Not adhesive backed)
3.2.2 BEFORE INSTALLATION
1. Insert the guide panels into the guides of the air condi-
tioner. Fasten the curtains to the unit with screws (TYPE
A) as shown Figure. 25.
TYPE A
2. Cut the adhesive-backed seal strip (TYPE D) to the window
width.
Remove the backing from the seal strip and attach the seal
strip to the underside of the bottom window. (Figure. 26)
TYPE A
Figure 25
3.2.3 NOW START INSTALLATION
1. LOCATING UNIT IN WINDOW
Open the window and mark center line on the center of
the inner sill, as shown in Figure. 27.
SEAL STRIP
(TYPE D)
2. ATTACH L BRACKET
a. Install the L brackets behind the inner window sill, with
the short side of bracket as shown.
Figure 26
Use the 2 screws (TYPE A) provided.
b. The bracket helps to hold unit securely in place. Be
sure to place bracket edge flush against back of inner
sill. See Figure. 27.
CENTER LINE
CAUTION
INNER SILL
During the following step, hold unit firmly until
window sash is lowered to top channel behind
side panel frames. Personal injury or property
damage may result if unit falls from window.
ROOM SIDE
Figure 27
—13—
3. INSTALL THE AIR CONDITIONER IN THE WINDOW
a. Carefully lift the air conditioner and slide it into the
open window. Make sure the bottom guide of the air
conditioner drops into the notches of the
INNER SILL
TYPE A
OUTER SILL
INSIDE
CENTER LINE
L bracket. See Figure. 28.
8"
SHORT SIDE
OUTSIDE
8"
Figure 28
L
BRACKET
IMPORTANT :
When the air conditioner drops into the L bracket, the air
conditioner will be centered in window opening as shown in
Figure. 29.
b. While steadying the air conditioner, carefully bring the
window sash down behind the upper guide of the air
conditioner, as shown in Figure. 30.
CENTER LINE
Figure 29
4. SECURE THE GUIDE PANELS
Extend the guide panels (TYPE F) to fill the window
opening using 4 screws (TYPE B) to secure them, as
shown in Figure. 31.
WINDOW FRAME
UPPER GUIDE
SEAL
ABOUT 1/4"
BOTTOM
GUIDE
5. INSTALL THE SASH SEAL AND SASH LOCK
a. Cut the sash seal (TYPE E) to the window width. Stuff
the sash seal between the glass and the window to
prevent air and insects from getting into the room, as
shown in Figure. 31.
L
BRACKET
Figure 30
b. Fasten the L bracket using a (TYPE A) screw, as
shown in Figure. 31.
L BRACKET
6. Window installation of room air conditioner is now
completed. See ELECTRICAL DATA for attaching
power cord to electrical outlet.
TYPE A
SASH SEAL
(TYPE E)
TYPE B
Figure 31
—14—
REMOVAL FROM WINDOW
Turn the air conditioner off, disconnect the power cord, remove the L bracket and the screws installed through the top and bot-
tom of the guide panels, and save for reinstallation later. Close the guide panels. Keeping a firm grip on the air conditioner,
raise the sash, and carefully tilt the air conditioner backward, draining any condensate water. Lift the air conditioner from the
window and remove the sash seal from between the windows.
4. TROUBLESHOOTING GUIDE
4.1 OUTSIDE DIMENSIONS (unit: mm [in])
21
9
21
42 (1 /32")
370 (14 /16")
472 (18 9/16")
42 (1 /32")
3
120 (4 /4")
3
27.5 (1 /32")
22.5(0.8 3/32")
155(6 3/32")
9
370 (14 /16")
9
472 (18 /16")
—15—
4.2 PIPING SYSTEM
CONDENSER COILS
FAN
MOTOR
CAPILLARY
TUBE
TURBO FAN
EVAPORATOR
COILS
Figure 32 is a brief description of the important components and their function in what is called the refrigeration
system. This will help you to understand 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
DISCHARGE
LINE
NOT HIGH PRESSURE
VAPOR
COMPRESSOR
OIL
LIQUID
PRESSURE
DROP
LIQUID OUTLET
(LIQUID REFRIGERANT)
HIGH PRESSURE VAPOR
LIQUID REFRIGERANT
LOW PRESSURE VAPOR
CAPILLARY TUBE
Figure 32
—16—
4.3 TROUBLESHOOTING GUIDE
In general, possible trouble is classified in two kinds.
The one is called Starting Failure which is caused by an electrical defect. The other is Ineffective Air Con-
ditioning caused by a defect in the refrigeration circuit and improper application.
Unit is running but cooling is ineffective.
Ineffective Cooling
Check cold air
circulation for smooth
flow.
Check outdoor coil
(heat exchanger) and
fan operation.
Check heat load
increase.
Clean condenser.
Dirty indoor coil
(heat exchanger)
Check gas leakage.
Repair gas leak.
Not on separate circuit
Malfunction of fan.
Check inside gas
pressure.
Replacement of unit if
the unit is beyond repair.
Clogging of air filter.
Obstruction at air outlet.
Remove obstruction.
Adjust refrigerant
charge.
Malfunction of
compressor.
Check clogging in refrigera-
tion circuit.
Replacement of
compressor.
Satisfactory operation
with temperature
Repair clogging in
refrigeration circuit.
difference of inlet & outlet
air: 55~59°F (13~15°C)
—17—
Fails to Start
Check of circuit breaker
and fuse.
Check of power source.
Check of control switch
setting.
Gas leakage of feeler
bulb of thermostat.
Check control switch.
Compressor fails only to
start.
Fan only fails to start.
Improper wiring.
Improper thermostat
setting
Drop of power voltage.
Defect of fan motor
capacitor.
Defect of compressor
capacitor.
Loose terminal
connection
Irregular motor
resistance (Ω)
Irregular motor
insulation (Ω)
Capacitor check.
Replacement.
Improper wiring
Replacement of fan motor.
Regular but fails to start.
Irregular motor resistance (Ω)
Irregular motor insulation (Ω)
Replacement of compressor.
(Locking of piston, metal.)
Replacement of compressor
(Motor damaged).
—18—
ROOM AIR CONDITIONER VOLTAGE LIMITS
NAME PLATE RATING
115V ± 10%
MINIMUM
103.5V
MAXIMUM
126.5V
COMPLAINT
CAUSE
REMEDY
Fan motor will not run.
No power
Check voltage at outlet. Correct if none.
Power supply cord
Rotary switch
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.
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. Re-align assembly.
Units using slinger ring condenser fans must
have 0.22~0.25 inch clearance to the base.
If necessary, 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.
Revolves on overload
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.
—19—
COMPLAINT
CAUSE
REMEDY
Fan motor noise.
Fan
If cracked, out of balance, or partially missing,
replace it.
Blower
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.
Compressor will not run,
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 the wires are discon-
nected, refer to wiring diagram for identification,
and replace the wires. Check the wire connections;
If not according to the wiring diagram, correct
the connections.
Rotary
Check for continuity, refer to the wiring diagram
for terminal identification. Replace the switch if
the circuit is open.
Thermostat
Check the position of knob. If not at the coldest
setting, advance the knob to this setting and
restart the unit.
Check the continuity of the thermostat. Replace
the thermostat if the circuit is open.
Capacitor (discharge
capacitor before
servicing.)
Check the capacitor.
Replace if not within ±10% of manufacturer’s
rating, replace if shorted, open, or damaged.
Compressor
Overload
Voltage
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, and retest.)
Compressor cycles on
overload.
Check the voltage. See the limits on the
preceding page. If voltage is not within these 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.)
—20—
COMPLAINT
CAUSE
Fan motor
REMEDY
Compressor cycles on
overload.
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
with a vacuum cleaner (do not damage fins) or
brush. Clean the interior base before
re-assembling.
Condenser fins
(damaged)
If the 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 the capacitor.
Wiring
Check the terminals. If loose, repair or replace.
Check the system for a restriction.
If restricted, clean or replace.
Refrigeration system
Air filter
Insufficient cooling
Excessive noise
Unit undersized
Blower or fan
Determine if the unit is properly sized for the
area to be cooled.
Check the set screw, or clamp. If loose or miss-
ing, correct. If the blower or fan is hitting scroll
or barrier, rearrange the air handling parts.
Copper tubing
Remove the cabinet and carefully rearrange the
tubing not to contact the cabinet,
compressor, shroud, and barrier.
—21—
5. CIRCUIT DIAGRAM
POWER INPUT
1
2
BK(BR)
WH(BL)
(Ribbed)
(Plain)
ROTARY SWITCH
GN(GN/YL)
1
3
5
2
4
6
H
L
BK
RD
BL
BK
RD
4
M
BL
MOTOR
OR(BR)
YL
7
8
CAPACITOR
F
YL
OR(BR)
C
H
6
7
BK
RD
BL
BK
RD
BL
R
S
COMP.
3
5
BR
C
BR
OLP
THERMOSTAT
SYNC. M.
YL
BR
BR
3854AR2330A
WIRING DIAGRAM
ROCKER SWITCH
LOCATION
Q'TY
DESCRIPTION
PART NO.
NO.
PER SET
2H00677P
POWER CORD ASSY
FAN MOTOR
1
2
3
4
5
6
7
1
1
1
1
1
1
1
4681A10016C
2520UCAA003
2H00154H
COMPRESSOR
ROTARY SWITCH
THERMOSTAT
CAPACITOR
2H01109H
0CZZA20005B
6750U-L050A
OVERLOAD PROTECTOR
—22—
6. EXPLODED VIEW
130910
559011
W48602
749740
554030
149980
267110
349480
731273
135312
352380
147581
147582-1
359012
346811
W48602
152302
352390
147582-2
354210
130410
135313
W0CZZ
264110
352111
352115
567502
554160
352113
237200
268711-1
263230
35211A
550140
238310 268711-2
249950
—23—
Replacement Parts List
RADS - 51B
LocNo
P/NO
REMARK
Description
BASE ASSEMBLY,WELD
CABINET ASSEMBLY,SINGLE
GRILLE ASSEMBLY,FRONT
GRILLE,INLET
R
R
R
R
R
R
R
R
R
130410
130910
135312
135313
147581
147582-1
147582-2
149980
152302
237200
238310
249950
263230
264110
267110
268711-1
268711-2
346811
349480
352111
352113
352115
35211A
352380
352390
354210
359012
550140
554030
554160
559011
567502
731273
749740
W0CZZ
W48602
3041A20036G
3091AR6055M
3531A20087D
3530A10039H
4520AR3191A
LINK
5990AR3190C
5990AR3190D
4998AR1608A
5231AR2148A
3720A20017A
3831A10001F
ABQ30999202
6323A20003S
6411A20056A
6711A20066C
EBR39266506
LOUVER,VERTICAL
LOUVER,VERTICAL
SHROUD
FILTER,AIR
PANEL,CONTROL
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
ESCUTCHEON
CASE ASSEMBLY,CONTROL
THERMISTOR,NTC
POWER CORD ASSEMBLY
REMOTE CONTROLLER ASSEMBLY
PCB ASSEMBLY,MAIN
PCB ASSEMBLY,DISPLAY
MOTOR ASSEMBLY,AC,SINGLE
ORIFICE
6871A20432B
4681A10016N
4948A10016B
5211AR3332N
5211A10129A
5211A10063E
5211A10062G
5238A20013A
5239A30003G
5421A20016L
5900A10005B
5040AR4195A
5403A20009R
2520UABC2JA
5901A20011B
6750U-L050A
3127A20074A
5210AR3196C
0CZZA20005B
3H02932B
TUBE ASSEMBLY,CAPILLARY
TUBE ASSEMBLY,DISCHARGE
TUBE ASSEMBLY,EVAPORATOR(IN)
TUBE ASSEMBLY,SUCTION
GUIDE,AIR
GUIDE ASSEMBLY,AIR
EVAPORATOR ASSEMBLY,FIRST
FAN,TURBO
DAMPER,COMPRESSOR
CONDENSER ASSEMBLY,FIRST
COMPRESSOR SET,KOREA
FAN ASSEMBLY,AXIAL
OVERLOAD PROTECT
INSTALL PART ASSEMBLY,SINGLE
GUIDE
，
CAPACITOR,FILM BOX
CLAMP,SPRING
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