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AD-183A
AD-243A
SERVICE MANUAL
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
Safety Precautions
Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must
be followed.
■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.
This symbol indicates the possibility of death or serious injury.
WARNING
CAUTION This symbol indicates the possibility of injury or damage to property only.
■ Meanings of symbols used in this manual are as shown below.
Be sure not to do.
Be sure to follow the instruction.
WARNING
■ Installation
Do not use damaged power cord plugs, or a
loose socket.
Always use the power plug and socket with
the ground terminal.
• There is risk of fire or electric shock.
• There is risk of electric shock.
Service Manual 3
Safety Precautions
Do not modify or extend the power cord.
Do not install, remove, or re-install the unit by
yourself.
• There is risk or fire or electric shock.
• There is risk of fire, electric shock, explosion, or injury.
Be cautious when unpacking and installing
the product.
Do not store or use flammable gas or com-
bustibles near the air conditioner.
• Sharp edges could cause injury. Be especially careful
of the case edges and the fins on the condenser and
evaporator.
• There is risk of fire or failure of product.
Sharp edges
Gasolin
Be sure the installation area does not deterio-
rate with age.
• If the base collapses, the air conditioner could fall with
it, causing property damage, product failure, and per-
sonal injury.
4 Room Air Conditioner
Dimensions
Dimensions
Symbols Used in this Manual
This symbol alerts you to the risk of electric shock.
This symbol alerts you to hazards that could cause harm to the
air conditioner.
NOTICE
This symbol indicates special notes.
Outside Dimensions
660
770
Model
18K Btu
24K Btu
Dimension
W
H
mm(inch)
mm(inch)
mm(inch)
660(26")
428(16 27/32")
770(305/16")
660(26")
428(16 27/32")
770(305/16")
D
Service Manual 5
Specfications
Product Specifications
Table -1
MODELS
RAD-183A
ITEMS
POWER SUPPLY
COOLING CAPACITY
INPUT
1Ø, 208/230V, 60Hz
17,500/18,000
1,800/1,850
E.E.R
9.0/8.3
REFRIGERANT (R-22) CHARGE(g)
720g(25.4oz)
27(DB),19(WB)
35(DB),24(WB)
2 ROW 15 STACKS
LOUVERED-FIN TYP
OPERATING
INDOOR(°C)
TEMPERATURE
EVAPORATOR
OUTDOOR(°C)
CONDENSER
2 ROW 19 STACKS,LOUVERED-FIN TYPE
L-BENDING TYPE
FAN, INDOOR
TURBO
PROPELLER TYPE FAN WITH SLINGER-RING
3/3
FAN, OUTDOOR
FAN SPEEDS, FAN/COOLING
FAN MOTOR
6 POLES
OPERATION CONTROL
ROOM TEMP. CONTROL
AIR DIRECTION CONTROL
WIRELESS REMOCN
THERMISTOR
VERTICAL LOUVER(RIGHT & LEFT)
HORIZONTAL LOUVER(UP & DOWN)
SLIDE IN-OUT CHASSIS
CONSTRUCTION
PROTECTOR
COMPRESSOR
INTERNAL OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
3 WIRE WITH GROUNDING
CORD-CONNECTED TYPE(ATTATCHMENT PLUG:OPTION)
DRAIN PIPE OR SPLASHED BY FAN SLINGER
137/62
FAN MOTOR
POWER CORD
DRAIN SYSTEM
NET WEIGHT
(lbs/kg)
OUTSIDE DIMENSION
(W x H x D)
(inch)
(mm)
26 x 16 27/32 x 30 5/16
660 x 428 x770
6 Room Air Conditioner
Specfications
Product Specifications
Table -1
MODELS
RAD-243A
ITEMS
POWER SUPPLY
COOLING CAPACITY
INPUT
1Ø, 208/230V, 60Hz
23,500/23,000
2,760/1,850
E.E.R
8.5/8.5
REFRIGERANT (R-22) CHARGE(g)
830g(29.3oz)
27(DB),19(WB)
35(DB),24(WB)
3 ROW 15 STACKS
LOUVERED-FIN TYP
OPERATING
INDOOR(°C)
TEMPERATURE
EVAPORATOR
OUTDOOR(°C)
CONDENSER
2 ROW 19 STACKS,LOUVERED-FIN TYPE
L-BENDING TYPE
FAN, INDOOR
TURBO
PROPELLER TYPE FAN WITH SLINGER-RING
3/3
FAN, OUTDOOR
FAN SPEEDS, FAN/COOLING
FAN MOTOR
6 POLES
OPERATION CONTROL
ROOM TEMP. CONTROL
AIR DIRECTION CONTROL
WIRELESS REMOCN
THERMISTOR
VERTICAL LOUVER(RIGHT & LEFT)
HORIZONTAL LOUVER(UP & DOWN)
SLIDE IN-OUT CHASSIS
CONSTRUCTION
PROTECTOR
COMPRESSOR
INTERNAL OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
3 WIRE WITH GROUNDING
CORD-CONNECTED TYPE(ATTATCHMENT PLUG:OPTION)
DRAIN PIPE OR SPLASHED BY FAN SLINGER
146/66
FAN MOTOR
POWER CORD
DRAIN SYSTEM
NET WEIGHT
(lbs/kg)
OUTSIDE DIMENSION
(W x H x D)
(inch)
(mm)
26 x 16 27/32 x 30 5/16
660 x 428 x770
7 Room Air Conditioner
Installation
Installation
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 sunlight does not shine directly
on the unit.
FENCE
AWNING
3.The outside of the cabinet must extend outward for at
least 30cm and there should be no obstacles, such as a
fence or wall, within 50cm 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
ABOUT 10~15mm
Over 50cm
CAUTION: All side louvers of the cabinet
must remain exposed to the outside of
the structure.
Figure 1
4.Install the unit a little slanted so the back is slightly lower
than the front (about 10~15mm). This will help force con-
densed water to the outside.
5.Install the unit from the bottom about 75~150cm above
the floor level.
Installation Check
The setting conditions must be checked prior to initial starting.
The following items are especially important checking points when the installation is finished.
1. Grounding wire (Green or Green and Yellow) is provided in the power cord. The green wire must be grounded.
2. Connect to a single-outlet 15A circuit.
(or 20A circuit for Electric Heater Model)
3. To avoid vibration or noise, make sure the air conditioner is installed securely.
4 Avoid placing furniture or draperies in front of the air inlet and outlet.
How to Secure the Drain Pipe
In humid weather, excess water may cause the BASE PAN to overflow. To drain
the water, remove the DRAIN CAP and secure the DRAIN PIPE to the rear hole of
the BASE PAN. Press the drain pipe into the hole by pushing down and away from
Drain pipe
the fins to avoid injury.
Drain cap
Optional
CABINET
SCREW
1. Install the drain pan over the corner of the cabinet where you removed the
plug with 4 (or 2) screws.
2. Connect the drain hose to the outlet located at the bottom of the drain pan.
You can purchase the drain hose or tubing locally to satisfy your particular
needs. (Drain hose is not supplied).
3. Select the most appropriate connection from among the following figures (by
considering the hole of the unit) to fit drain pan to your own unit.
Fig. 2
Fig. 4
Fig. 1
DRAIN HOSE
DRAIN
PAN
Fig. 3
Service Manual 8
Installation
Window Requirements
NOTICE
All supporting parts should be secured to firm
wood, masonry, or metal.
26" to 41"
1. This unit is designed for installation in standard dou-
ble hung windows with actual opening widths from
26" to 41".
18" min
Stool
Offset
The top and bottom window sashes must open suffi-
ciently to allow a clear vertical opening of 18" from
the bottom of the upper sash to the window stool.
Less
than 1 1/4"
Sill
2. The stool offset (height between the stool and sill)
must be less than 1 1/4".
Exterior
Interior wall
26" min.
(Without frame curtain)
Installation Kits Contents
Foam strip
(Plain-Back)
Foam-PE
(Adhesive-Backed)
Foam-PE
(Adhesive-Backed)
Left frame
curtain
Drain joint pipe
Frame guide(2)
Window locking
bracket
Right frame
curtain
Sill bracket(2)
Type A (14)
Support bracket(2)
Type B (7)
Type C (5)
Type D (2)
Carriage Bolt (2)
Lock Nut (4)
9 Room Air Conditioner
Installation
Suggested Tool Requirements
PREPARATION OF CHASSIS
Shipping screws
1. Remove the screws which fasten the cabinet at both
sides and at the back.
Figure 2
2. Slide the unit out from the cabinet by gripping the
base pan handle and pulling forward while bracing
the cabinet.
3. Cut the window sash seal to the proper length. Peel
off the backing and attach the Foam-PE to the
underside of the window sash.
Figure 3
4. Remove the backing from Foam-PE with 3 holes
and attach it to the bottom of the Top retainer bar.
Top retainer bar
5. Attach the Top retainer bar on the top of the cabinet
with 3 screws (Type A).
Foam-PE
Foam-PE
Figure 4
6. Insert the Frame guides into the bottom of the cabi-
net.
Top retainer bar
7. Insert the Frame Curtain into the Top retainer bar
and Frame guides.
8. Fasten the curtains to the unit with 10 screws
(Type A) at both sides.
Screw
(Type A)
Screw(Type A)
Figure 5
Frame guide
Service Manual 10
Installation
Cabinet Installation
1. Open the window. Mark a line on the center of the
window stool between the side window stop mold-
ings.
Sill
Bracket
Support
Bracket
Loosely attach the sill bracket to the support bracket
using the carriage bolt and the lock nut.
Carriage
Bolt
(M-Screw)
Lock nut
Figure 6
2. Attach the sill bracket to the window sill using the
screws (Type B).
Machine screw(Type D)
and lock nut
Carefully place the cabinet on the window stool and
align the center mark on the bottom front with the
center line marked window stool.
Cabinet
Track hole
Outer edge
of window
sill
Support
Bracket
Screw(Type B)
Carriage bolt
and lock nut
Sill bracket
Figure 7
3. Using the M-screw and the lock nut, attach the sup-
port bracket to the cabinet track hole. Use the first
track hole after the sill bracket on the outer edge of
the window sill. Tighten the carriage bolt and the lock
nut. Be sure the cabinet slants outward.
Top
retainer
bar
CAUTION: Do not drill a hole in the
bottom pan. The unit is designed to
operate with approximately 1/2" of
water in bottom pan.
Window stool
Figure 8
Front angle
Window sash
Foam-PE
Top retainer bar
4. Pull the bottom window sash down behind the Top
retainer bar until they meet.
NOTICE
Cabinet
Frame curtain
1. Do not pull the window sash down so tightly that the
movement of Frame curtain is restricted. Attach the
cabinet to the window stool by driving the screws
(Type B) through the cabinet into window stool.
Foam-PE
Figure 9
2. The cabinet should be installed with a very slight tilt
downward toward the outside.
Sash track
Front Angle
Screw(Type B)
Figure 10
11 Room Air Conditioner
Installation
5. Pull each Frame curtain fully to each window sash
track, and pull the bottom window sash down behind
the Top retainer bar until it meets.
w(Type C)
Scre
6. Attach each Frame curtain the window sash by using
screws (Type C.) (See Fig. 11)
Figure 11
7. Slide the unit into the cabinet.(See Fig. 12)
CAUTION: For security purpose, rein-
stall screws(Type A) at cabinet's
sides.
Power Cord
Screw (Type A)
Figure 12
Screw
8. Cut the Foam-strip to the proper length and insert
between the upper window sash and the lower win-
dow sash.(See Fig. 13)
Foam-Strip
Figure 13
9. Attach the Window locking bracket with a screw
(Type C.) (See Fig. 14)
Window locking
bracket
Figure 14
10. Attach the front grille to the cabinet by inserting the
tabs on the grille into the tabs on the front of the
cabinet. Push the grille in until it snaps into
place.(See Fig.15)
11. Lift the inlet grille and secure it with a screw (Type
A) through the front grille.(See Fig. 15)
Figure 15
12. Window installation of room air conditioner is now
completed. See ELECTRICAL DATA for attaching
power cord to electrical outlet.
Figure 16
Service Manual 12
Operation
Operation
Features
• Designed for COOLING ONLY.
• Powerful and whispering cooling.
• Slide-in and slide-out chassis for the simple instal-
lation and service.
• Built-in adjustable THERMOSTAT
• Washable one-touch filter
• Compact size
• Side air-intake, side cooled-air discharge.
• Reliable and efficient rotary compressor
Control Locations Function of Controls
1. Cooling Only Model
• 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 OPEN position.
The damper is opened and room air is exhausted.
CLOSE
VENT
OPEN
NOTICE 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 a higher number for a cooler tem-
perature in the room. The temperature is selected by
positioning the knob to the desired position.
The 5 or 6 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.
Thermostat
Operation
Auto Swing
Off
5
4
6
Med
Fan
High
Cool
LOW FAN : Permits the low fan speed operation
without cooling.
Off
On
3
7
8
HIGH COOL: Permits cooling with the high fan speed
operation.
2
Low
Fan
Med
Cool
1
9
MED COOL : Permits cooling with the medium fan
speed operation.
Low Cool
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.
13 Room Air Conditioner
Operation
2. Cooling Only Model with Remote Control and Touch Type
DISPLAY
REMOTE CONTROL
RAD-183A
RAD-243A
RAD-183A, RAD-243A
2
7
3
Power
1
Temp
8
5
Fan Speed
4
2
Timer
Mode
1
3
6
Energy
Saver
Auto
Swing
7
5
6
4
PRECAUTION: The Remote Control unit will not
function properly if bright light strikes the sensor window of the air conditioner or if
there are obstacles between the Remote Control unit and the air conditioner.
POWER BUTTON
Operation starts, when this button is pressed and stops when you press the button again.
OPERATION MODE SELECTION BUTTON
Select Cooling, or Fan or Dehumid mode with button. (Dehumid mode is not to all models.)
ON/OFF TIMER BUTTON
Set the time of starting and stopping operation. The timer is set by 1 hour.
FAN SPEED SELECTOR
Select the fan speed in three steps.
- High [F3] ■ Low[F1] ■ Med[F2] ■ High[F3]... .
ROOM TEMPERATURE SETTING BUTTON
Control the room temperature within a range of 60°F to 86°F by 1°F.
ENERGY SAVER(Available In some models)
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.
6
7
AUTO SWING BUTTON
Control the horizontal air direcion by air swing system.
AUTO RESTART
In case the power comes on again after a power failure, the unit runs as previous setting operation.
Service Manual 14
Disassembly
Disassembly
— Before the following disassembly, CONTROL BOX set to OFF and disconnect the power cord.
Mechanical Parts
1. Front Grille
1. Open the lnlet grille upward .
2. Remove the screw that fastens the front grille.
3. Pull the front grille from the right side.
4. Remove the front grille.
5. Re-install the component by referring to the removal
procedure, above.(See Figure 17)
NOTICE Mark " "of inlet grille means opening
direction.
2. Cabinet
1. After disassembling the FRONT GRILLE, remove the
2 screws that fasten the cabinet at both sides.
2. Remove the 2 screws that fasten the cabinet at back.
3. Pull the base pan forward. (See Figure 18)
4. Remove the cabinet.
Figure 17
5. Re-install the component by referring to the removal
procedure, above.
3. Control Box
1. Remove the front grille. (Refer to section 17)
2. Remove the cabinet. (Refer to section 18)
3. Remove the 2 screws that fasten the control box
cover.
Figure 18
4. Remove two housings that connect compressor wire
and motor wire in the control box.
5. Discharge the capacitor by placing a 20,000 ohm
resistor across the capacitor terminals.
6. Remove the 2 screws that fasten the control box.
7. Pull the control box forward completely.
8. Re-install the components by referring to the removal
procedure, above. (See Figure 19)
(Refer to the circuit diagram found on page 23 in this
manual and on the control box.)
Figure 19
15 Room Air Conditioner
Disassembly
Air Handling Parts
4. Cover (at the top)
1. Remove the front grille. (Refer to section 17)
2. Remove the cabinet. (Refer to section 18)
3. Remove 11 screws which fasten the brace and
covers.
4. Remove the covers and the brace. (See Fig. 20)
5. Re-install the components by referring to the
removal procedure, above.
Figure 20
5. Blower
1. Remove the cover. (Refer to section 20)
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 Fig. 21)
6. Remove the blower with plier or your hand without
touching blades. (See Fig. 22)
7. Re-install the components by referring to the
removal procedure, above.
Figure 21
Figure 22
6. Fan
1. Remove the cabinet. (Refer to section 18)
2. Remove the brace and shroud cover.
(Refer to section 20)
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 23)
7. Re-install the components by referring to the
removal procedure, above.
Figure 23
Service Manual 16
Disassembly
6. Shroud
1. Remove the fan. (Refer to section 21)
2. Remove the screw that fastens the shroud.
3. Remove the shroud. (See Figure 24)
4. Re-install the component by referring to the
removal procedure, above.
Figure 24
Electrical Parts
7. Motor
1. Remove the cabinet. (Refer to section 18)
2. Remove the cover control and disconnect a wire
housing in control box. (Refer to section 19)
3. Remove the blower. (Refer to section 21)
4. Remove the fan. (Refer to section 22)
5. Remove the 4 screws which fasten the motor.
(See Figure. 25)
6. Remove the motor.
7. Re-install the components by referring to the
removal procedure, above.
Figure 25
8. Compressor
1. Remove the cabinet. (Refer to section 18)
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 suc-
tion and discharge tubes at the compressor con-
nections.
5. Remove the 3 nuts and the 3 washers which fas-
ten the compressor.
6. Remove the compressor. (See Figure 26)
7. Re-instill the components by referring to the
removal procedure, above.
Figure 26
17 Room Air Conditioner
Disassembly
9. Capacitor
1. Remove the control box. (Refer to section 19)
2. Remove the knobs and the screw that fasten
control panel from control box.
3. Remove the screw that located in the front.
4. Open the bottom side of control box.
5. Remove the screw and the clamp that fastens
the capacitor.
6. Disconnect all the leads of capacitor terminals.
7. Re-install the components by referring to the
removal procedure, above. (See Figure 27)
Figure 27
10. Power Cord
1. Remove the control box. (Refer to section 19)
2. Open the control box. (Refer to section 25)
3. Disconnect the grounding screw from the control
box.
4. Disconnect the 2 receptacles.
5. Remove a screw which fastens the clip cord.
(See Figure 28)
6. Remove the power cord.
7. Re-install the component by referring to the
above removal procedure, above.
Figure 28
(Use only one ground-marked hole
connection.)
for ground
8. If the supply cord of this appliance is damaged, it
must be replaced by the special cord. (The
special cord means the cord that has the same
specification marked on the supply cord attached
at the unit.)
11. Thermistor
1. Remove the control box. (Refer to section 19)
2. Unfold the control box. (Refer to section 25)
3. Disconnect the themistor terminals from main
P.W.B Assembly.
Figure 29
4. Remove the thermistor.
6. Re-install the components by refereing to the
above removal procedure above. (See Figure 29)
12. Synchronous Motor
1. Remove the control box. (Refer to section 19)
2. Unfold the control box. (Refer to section 25)
3. Remove the crankshaft.
4. Disconnect all the leads of the synchronous
motor.
5. Remove the 2 screws which fasten the syn-
chronous motor. (See Figure. 30)
6. Re-install the components by referring to the
above removal procedure above.
Figure 30
Service Manual 18
Disassembly
Refrigerating Cycle
CAUTION: Discharge the refrigerant
system using a FreonTM Recovery
System. If there is no valve to attach the
recovery system, install one (such as a
WATCO A-1) before venting the FreonTM.
Leave the valve in place after servicing
the system.
13. Condenser
1. Remove the cabinet. (Refer to section 18)
2. Remove the 4 screws that fasten the brace.(Refer
to section 20)
3. Remove the 5 screws that fasten the condenser
and shroud.
4. After discharging the refrigerant completely,
unbraze the interconnecting tube at the condenser
connections.
5. Remove the condenser.
6. Re-install the component by referring to notes.
(See Figure 31)
Figure 31
14. Evaporator
1. Remove the cabinet. (Refer to section 18)
2. Remove the 2 screws that fasten the evaporator.
3. Move the evaporator sideways carefully.
(Refer to section 20)
4. After discharging the refrigerant completely,
unbraze the interconnecting tube at the evaporator
connections.
5. Remove the evaporator.
6. Re-install the component by referring to notes.
(See Figure 32)
15. Capillary Tube
1. Remove the cabinet. (Refer to section 18)
2. After discharging the refrigerant completely,
unbraze the interconnecting tube at the capillary
tube.(See caution above)
3. Remove the capillary tube.
4. Re-install the component by referring to notes.
Figure 32
19 Room Air Conditioner
Disassembly
NOTICE
— Replacement of the refrigeration cycle.
6. Recharge as follows :
1. When replacing the refrigeration cycle, be sure to
TM
Discharge the refrigerant system using a Freon
recovery System.
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
33B.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before venting
TM
the Freon . 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.
With valve C open, discharge the hose at the mani-
fold connection.
3. Braze service valves into the pinch-off tube ports,
leaving the valves open.
4. Braze the pinch-off tubes with Service valves.
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. Evacuate as follows.
1) Connect the vacuum pump, as illustrated figure
33A.
5) With the unit running, open valve B and add the
balance of the charge.
2) Start the vacuum pump, slowly open manifold
valves A and B with two full turns counterclockwise
and leave the valves open.
a. Do not add the liquid refrigerant to the Low-
side.
b. Watch the Low-side gauge; allow pressure to
rise to 30 lbs (0.2Mp).
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.
The vacuum pump is now pulling through valves
A and B up to valve C by means of the manifold
and entire system.
CAUTION: If high vacuum equip-
ment 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 brazing rod and braze
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.
3) Operate the vacuum pump vaccum 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 indi-
cate a possible leak or moisture remaining in the
system. With valves A and B closed, stop the vac-
uum pump.
4) Remove the hose from the vacuum pump and
place it on the charging cylinder. See figure 33B.
Open valve C.
Discharge the line at the manifold connection.
5) The system is now ready for final charging.
Service Manual 20
Disassembly
Equipment needed: Vacuum pump, Charging cylinder, Manifold gauge, Brazing equipment. Pin-off tool capable
of making a leak-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
A
B
B
EXTERNAL
VACUUM PUMP
CHARGING
CYLINDER
C
Figure 33B-Charging
Figure 33A-Pulling Vacuum
21 Room Air Conditioner
Schematic Diagram
Schematic Diagram
Electronic Control Device
S E G - d
S E G - e
S E G - f
S E G - g
T E S T
/ R e s e t
O s c i n
V D D
O s c o u t
V S S
S L I D E S W
V A r e f
K E Y 0
K E Y 1
R o o m T H
P i p e T H
O p t i o n 1
O p t i o n 2
L E D o u t 0
L E D o u t 1
L E D o u t 2
Service Manual 22
Schematic Diagram
Wiring Diagram
• MODEL : RAD-183A and RAD-243A
POWER INPUT
WH(BL)
(Ribbed)
BK(BR)
(Plain)
GN/YL(GN)
THERMISTOR
CN-TH1
BK
BK
BL
BL
RD
OR(BR)
YL
RD
OR(BR)
YL
MOTOR
GN/YL
(GN)
CAPACITOR
F
C
OR(BR)
BK
RD
SYNC
MOTOR
BK
RD
BR
BR
H
PTC
RY-SYNC
ZNR
BK
RD
BL
R
S
C
RY-COMP
COMP.
4
3
TRANS
FORMER
BL
FUSE 250V/T2A
OLP
(115V/T2A)
3854AR2330P
WIRING DIAGRAM
23 Room Air Conditioner
Schematic Diagram
Components Location
Main P.W.B Assembly
Display P.W.B Assembly
Service Manual 24
Troubleshooting Guide
Troubleshooting Guide
Piping System
CONDENSER COIL
FAN
CAPILLARY TUBE
COMPRESSOR
MOTOR
BLOWER
EVAPORATOR COIL
Figure 34 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 CONITIONER
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 34
25 Room Air Conditioner
Troubleshooting Guide
Troubleshooting Guide
In general, possible trouble is classified in two kinds.
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 cold air circulation
for smooth flow.
Check outdoor coil
(heat exchanger) & the fan
operation.
Check heat load
increase.
Dirty indoor coil
(Heat exchanger)
Unexpected residue
Overloaded circuit
Check gas leakage.
Repair gas leak.
Malfunction of fan
Clogged of air filter.
Check inside gas
pressure.
Replacement of unit if the
unit is beyond repair.
Obstruction at air outlet
Stop of auto air-swing
Correct above trouble
Adjusting of refrigerant
charged.
Malfunction of compressor.
Check clogging in refrigera-
tion circuit.
Replacement of
compressor.
Satisfactory operation with
temperature difference of
inlet & outlet air ;
Repair clogging in refrigera-
tion circuit.
44~50°F(7~10°C)
Service Manual 26
Troubleshooting Guide
Fails to Start
Check of power source.
Check circuit breaker
and fuse.
Check of control switch
setting.
Gas leakage of feeler bulb
of thermostat
Check of control switch.
Compressor only fails to
start.
Fan only fails to start.
Improper wiring.
Drop of power voltage.
Improper thermostat setting.
Defect of fan motor
capacitor.
Defect of compressor
capacitor.
Loose terminal connection.
Improper wiring.
Irregular motor resistance
(
).
Irregular motor insulation
).
Capacitor check.
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)
27 Room Air Conditioner
Troubleshooting Guide
Electrical Parts Troubleshooting Guide
Possible Trouble 1 The unit does not operate.
NO
• Check the Fuse.
• Check the wiring diagram.
Is the Trans output power
AC 220V?
YES
NO
NO
• Check the Main
PCB pattern.
Is the Trans output power
Is shorted the Trans. output?
YES
about AC 14V?
YES
• Exchange the Trans.
• Exchange D02D~D05D.
• Exchange IC01D.
NO
NO
Is output Voltage of IC01D
DC 12V?
YES
• Exchange IC02D.
Is output Voltage of IC02D
DC 5V?
YES
NO
NO
Is the reset circuit all right?
(The No.16 of
• Exchange IC01A, C02A.
Micom is 5V.)
YES
Is the
• Connect connector
exactly.
connection between
Main and Display
all right?
YES
NO
• Check the PCB
pattern.
Is the voltage No.20 of Micom
DC 5V?
YES
Exchange Main PCB Ass'y.
Service Manual 28
Troubleshooting Guide
Possible Trouble 2 The compressor does not operate.
Is setting
NO
• Select the setting Temp. to lower Number.
Temp. set lower than Room
Temp.-0.5°C?
YES
NO
NO
NO
Is the voltage No.10
of IC01M 0V?
Is the voltage N0.7 of
Is the Unit for 3 minutes
delay?
IC01M DC 5V?
YES
YES
YES
• Check the RY-COMP.
• Check the wiring
Diagram.
• Exchange IC01M.
• Wait 3 Minutes.
• Exchange MAIN
PCB Ass'y.
Possible Trouble 3 The compressor always operate.
• Connect LEAD Wire to
RY-COMP again.
NO
Is the wire connection of
RY-COMP all right?
YES
• Check the RY-COMP.
29 Room Air Conditioner
Troubleshooting Guide
• Exchange IC01M.
Possible Trouble 4 FAN does not operate.
NO
Is the voltage NO.1 or 4
of IC01M DC 5V?
YES
NO
Is the voltage NO.13 or 16
• Exchange IC01M.
of IC01M 0V?
YES
• Check the RY-Hi or
RY-Lo.
•
Check the wiring diagram.
Possible Trouble 5 Auto Swing does not operate.
NO
NO
Is the voltage NO.6
of IC01M DC 5V?
• Exchange Micom.
• Exchange IC01M.
YES
Is the voltage NO.11
of IC01M 0V?
YES
• Check the RY-SYNC.
• Check the connectionn
of CN-SYNC.
• Check the PCB pattern.
Service Manual 30
Troubleshooting Guide
Possible Trouble 6 Remote controller does not operate.
NO
Is the voltage of Battery
about over 2.3V?
• Exchange the battery.
• Check the PCB pattern.
YES
Is the voltage No.16
of CN-DISP on Main PCB
Ass'y DC 5V?
NO
YES
• Connect connector to
CN-DISP exactly.
NO
Is the connection of
CN-DISP all right?
YES
• Exchange Receiver Ass'y.
Possible Trouble 7 It displays abnormally on display PCB Ass'y.
NO
• Exchange IC01G.
Is the IC01G all right?
YES
NO
• Connect connector
to CN-DISP exactly.
NO
NO
Is the connection of
CN-DISP all right?
YES
Does the
Q01G~Q04G operate normally
on main PCB Ass'y?
• Exchange
Q01G-Q04G.
YES
• Exchange the display
PCB Ass'y.
31 Room Air Conditioner
Troubleshooting Guide
Room Air Conditioner Voltage Limits
NAME PLATE RATING
208~230±10%
115±10%
MINIMUM
187V
MAXIMUM
253V
104V
126V
COMPLAINT
CAUSE
REMEDY
Fan motor will not run.
No power
Check voltage at outlet. Correct if necessary.
Power supply cord
Check voltage to rotary switch. If none, check power
supply cord. Replace cord if circuit is open.
Rotary switch
Check switch continuity. Refer to wiring diagram for
terminal identification. Replace switch if defective.
Wire disconnected or con-
nection loose
Connect wire. Refer to wiring diagram for terminal
identification. Repair or replace loose terminal.
Capacitor (Discharge
capacitor before testing.)
Test capacitor.
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 for condenser fan must have
1/4 to 5/16 inch clearance to the base. If it hits 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.
Revolves on overload.
Check voltage. If not within limits, call an electrician.
Fan motor runs
intermittently
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
If cracked, out of balance, or partially missing,
replace it.
Fan motor noise.
Turbo
If cracked, out of balance, or partially missing,
replace it.
Loose clamper
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.
Check voltage.
If not within limits, call an electrician.
Compressor will not run,
but fan motor runs.
Voltage
Wiring
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.
Rotary
Service Manual 32
Troubleshooting Guide
COMPLAINT
CAUSE
Thermostat
REMEDY
Compressor will not run,
but fan motor runs.
Check the position of knob If not at the coldest set-
ting, advance the knob to this setting and restart
unit.
Check continuity of the thermostat. Replace ther-
mostat if circuit is open.
Thermistor
Check the TEMP control. If not at the lowest num-
ber, set TEMP control to this setting and restart
the unit. Check the continuity of the thermistor.
Replace the thermistor if the circuit is open.
Check the capacitor.
Capacitor (Discharge
Replace if not within ±10% of manufacturers rat-
ing. Replace if shorted, open, or damaged.
capacitor before servicing.)
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 tem-
perature is high, remove the overload, cool it, and
retest.)
Compressor cycles on
overload.
Check the voltage.
If not within limits, call an electrician.
Voltage
Check overload, if externally mounted.
Overload
Replace if open. (If the compressor temperature is
high, remove the overload, cool, and retest.)
If not running, determine the cause. Replace if
required.
Compressor cycles on
overload.
Fan motor
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.
Condenser air flow restric-
tion
If condenser fins are closed over a large area on
the coil surface, head pressures will increase,
causing the compressor to overload. Straighten
the fins or replace the coil.
Condenser fins (damaged)
Test capacitor.
Capacitor
Compressor cycles on
overload.
Check the terminals. If loose, repair or replace.
Check the system for a restriction.
If restricted, clean of replace.
Close if open.
Wiring
Refrigerating system
Air filter
Insufficient cooling or heat-
ing
Exhaust damper door
Unit undersized
Determine if the unit is properly sized for the area
to be cooled.
Excessive noise
Check the set screw or clamp. If loose or missing,
correct. If the turbo or fan is hitting air guide,
rearrange the air handling parts.
Turbo or fan
Remove the cabinet carefully and rearrange tubing
not to contact cabinet, compressor, shroud, and
barrier.
Copper tubing
33 Room Air Conditioner
Troubleshooting Guide
REMEDY
COMPLAINT
CAUSE
Capacitor
Wiring
Compressor cycles
on overload.
Test capacitor.
Check the terminals. If loose, repair or replace.
Check the system for a restriction.
If restricted, clean of replace.
Refrigerating system
Air filter
Insufficient cooling or heat-
ing
Exhaust damper door
Unit undersized
Close if open.
Determine if the unit is properly sized for the area to
be cooled.
Turbo or fan
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.
Excessive noise.
Copper tubing
Rotary switch.
Remove the cabinet and carefully rearrange tubing
not to contact cabinet, compressor, shroud, and bar-
rier.
Set the knob to HIGH COOL or LOW COOL while
rocker switch is ON.
Auto air-swing fails.
Wiring
Check terminals. If loose, repair or replace.
Check the synchronous motor for open circuit.
Synchronous motor.
Service Manual 34
Exploded View
Exploded View
Cooling Model
554031
148000
130910
W48602
559011
149980
749750
349600
130410
346811
554160
550140
359012
349480
354210
325115-1
325115-2
147582
349001
W48602
552111
267110
352113
552113
249950
W0CZZ
135312
567480
35211A
159830
249950
135314
268711-1
269310
146812
137215
238310
135510
W0CZZ
137215
146812
135500
266002
147581-2
266003
149410
268711-2
147581-1
264100
264110
35 Room Air Conditioner
Replacement Parts List
RAD-183A
LocNo
P/NO
REMARK
DESCRIPTION
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
R
R
R
R
R
R
R
R
R
R
R
R
130410
130910
135312
135314
135510
146812
147581-1
147581-2
147582
148000
149980
159830
137215
238310
249950
567480
264100
267110
268711-1
268711-2
346811
349001
349480
349600
552113
352113
35211A
749750
354210
359012
552111
554031
554160
559011
W0CZZ
W48602
325115-1
325115-2
550140
3041A30001H
3091AR6056P
AEB30969401
3530AR1604A
3551A30001A
2H01102J
BASEASSEMBLY,SINGLE
CABINETASSY,SINGLE
Grille,ASSY,Front(SINGLE)
Grille,ASSY,INLET
COVER,CONTROL(INDOOR)
MotorAssembly,SYNC
LOUVER,HORIZONTAL
LOUVER,HORIZONTAL
LOUVER,VERTICAL
4758AR7264A
4758AR7278A
4758AR6157A
4800AR7271A
4998AR1597B
5231AR6159A
3720AR6163A
3831A20032L
4995A20613Y
6323A20003S
6411A20056P
6711A20035A
6871A20611A
6871A10193N
4681A20081T
4900AR7265A
4948A20016A
4960AR1596A
5211AR7059A
BRACE
SHROUD
FILTERASSY,A/C
PANEL,CONTROL
ESCUTCHEON
CONTROLBOXASSEMBLY,SINGLE
Thermistor ASSEMBLY
POWER CORD ASSEMBLY
REMOTECONTROLLER
PWB(PCB) ASSEMBLY,DISPLAY
PWB(PCB) ASSEMBLY,MAIN
MOTOR ASSEMBLY,SINGLE
DAMPER,VENTILAYION
ORIFICE
MOUNT,MOTOR
TUBE ASSEMBLY,CONDENSER OUT
5211A25040B TUBE ASSEMBLY,DISCHARGER SINGLE
5211A10247P
5239A20001W
5421A20248G
5900A20027A
5210A24956H
5403A20062F
2520UCBJ002
5900AR1508B
0CF1042856A
3H02932C
TUBE ASSEMBLY,SUCTIONSINGLE
AIR GUIDE ASSEMBLY
EVAPORATOR ASSEMBLY,FIRST
FAN,TURBO
Tube,BENDING
CONDENSER ASSEMBLY,BEND
COMPRESSOR
FANASSEMBLY,AXIAL
CAPACITOR
CLAMP,SPRING
5210A21083B
5210A21083C
4H00982C
TUBE,EVAPORATOR
TUBE,EVAPORATOR
ISOLATOR, COMP
Replacement Parts List
RAD-243A
LocNo
P/NO
REMARK
DESCRIPTION
130410
130910
135312
135314
135510
146812
147581-1
147581-2
147582
148000
149980
159830
137215
238310
249950
567480
264100
267110
268711-1
268711-2
346811
349001
349480
349600
552113
352113
35211A
749750
354210
359012
552111
554031
554160
559011
W0CZZ
W48602
325115-1
325115-2
550140
3041A30001F
3091AR6056P
AEB30969401
3530AR1604A
3550AR7046D
2H01102J
BASE ASSEMBLY,SINGLE
CABINET ASSY,SINGLE
Grille ASSY,Front(SINGLE)
Grille ASSY,INLET
COVER,CONTROL(INDOOR)
Motor Assembly,SYNC
LOUVER,HORIZONTAL
LOUVER,HORIZONTAL
LOUVER,VERTICAL
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
R
R
R
R
R
R
R
R
R
R
R
R
4758AR7264A
4758AR7278A
4758AR6157A
4800AR7271A
4998AR1597B
5231AR6159A
3720AR6163A
3831A20032L
ABQ32895801
6323A20003S
6411A20056Q
6711A20035A
6871A20611A
6871A10193N
4681A20081W
4900AR7265A
4948A20016A
4960AR1596A
5211AR7059E
BRACE
SHROUD
FILTER ASSY,A/C
PANEL,CONTROL
ESCUTCHEON
CONTROL BOX ASSEMBLY,SINGLE
Thermistor ASSEMBLY
POWER CORD ASSEMBLY
REMOTE CONTROLLER
PWB(PCB) ASSEMBLY,DISPLAY
PWB(PCB) ASSEMBLY,MAIN
MOTOR ASSEMBLY,SINGLE
DAMPER,VENTILAYION
ORIFICE
MOUNT,MOTOR
TUBE ASSEMBLY,CONDENSER OUT
5211A21526J TUBE ASSEMBLY,DISCHARGER SINGLE
5211A10094P
5239A20001W
5421A20248F
5900A20027A
5210A24956J
5403A20062F
5416A20045B
5900AR1508B
0CF1042856A
3H02932C
TUBE ASSEMBLY,SUCTION SINGLE
AIR GUIDE ASSEMBLY
EVAPORATOR ASSEMBLY,FIRST
FAN,TURBO
Tube,BENDING
CONDENSER ASSEMBLY,BEND
COMPRESSOR
FAN ASSEMBLY,AXIAL
CAPACITOR
CLAMP,SPRING
5210A30144U
5210A30144V
4022A30008A
TUBE,EVAPORATOR
TUBE,EVAPORATOR
ISOLATOR, COMP
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04/18/07
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