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REG-183A
REG-243A
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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(customer).
• 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
D
W
Model
REG-183A
REG-243A
Dimension
W
H
mm(inch)
mm(inch)
mm(inch)
660 (26)
660 (26)
428 (16 27/32)
428 (16 27/32)
770 (30 5/16)
5
D
770(30 /16)
Service Manual 5
Specfications
Product Specifications
MODELS
REG-183A
REG-243A
ITEMS
1Ø, 208/230V, 60Hz
17,500/17,000
1,800/1,750
8.2/8.8
1Ø, 208/230V, 60Hz
23,00/23,500
2,700/2,760
13.2/12.2
POWER SUPPLY
COOLING CAPACITY
INPUT
(Btu/h)
(W)
RUNNING CURRENT
E.E.R
(A)
9.7/9.7
8.5/8.5
(BTU/W.h)
(Btu/h)
11,600/9,400
3,100/3,670
15.0/16.0
9,400/11,600
3,750/3,770
15.0/16.0
HEATING CAPACITY
INPUT
(W)
RUNNING CURRENT
(A)
26.7 (DB)* 19.4 (WB)**
INDOOR(°C)
OUTDOOR(°C)
INDOOR(°C)
OUTDOOR(°C)
COOLING
35 (DB)* 23.9 (WB)**
21.1 (DB)* 15.6 (DB)**
OPERATING
CONDITION
HEATING
8.3 (DB)*
6.1 (DB)**
1040(36.7oz)
810(28.6oz)
REFRIGERANT (R-22) CHARGE
EVAPORATOR
3ROW 18STACKS
3ROW 15STACKS
2ROW 16STACKS,L-BENDING TYPE
2ROW 19STACKS,L-BENDING TYPE
CONDENSER
BLOWER
PROPELLER TYPE FAN WITH SLINGER-RING
1 / 2 / 2 1 / 2 / 2
FAN, INDOOR
FAN, OUTDOOR
FAN SPEEDS, FAN/COOLING/HEATING
FAN MOTOR
6 POLES
TOUCH PANEL
THERMISTOR
OPERATION CONTROL
ROOM TEMP. CONTROL
VERTICAL LOUVER(RIGHT&LEFT)
HORIZONTAL LOUVER(UP&DOWN)
SLIDE IN-OUT CHASSIS
AIR DIRECTION CONTROL
CONSTRUCTION
ELECTRIC HEATER
COMPRESSOR
3.5KW, 230V
INTERNAL OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
FUSE LINK, BIMETAL THERMOSTAT
1.6m(3 WIRE WITH GROUNDING)
ATTACHMENT PLUG(CORD-CONNECTED TYPE)
DRAIN PIPE OR SPLASHED BY FAN SLINGER
PROTECTOR
FAN MOTOR
ELECTRIC HEATER
POWER CORD
DRAIN SYSTEM
NET WEIGHT
137/62
146/66
(lbs/kg)
26 X 16 27/32 X 30 5/16
26 X 16 27/32 X 30 5/16
OUTSIDE DIMENSION
(W x H x D)
(inch)
(mm)
660 X 428 X 770
660 X 428 X 770
* DB:Dry Bulb
**WB:Wet Bulb
NOTE: Please refer to Label Quality on the produst since this specification may be changed for improving performance.
6 Room Air Conditioner
Installation
INSTALLATION
How to Install the unit
1. To avoid vibration and noise, make sure the unit is
installed securely and firmly.
1/4 Bubble
2. Install the unit where the sunlight does not shine directly
on the unit.
If the unit receives direct sunlight, build an awning to
shade the cabinet.
Level
3. There should be no obstacle, like a fence, within 20"
which might restrict heat radiation from the condenser.
4. To prevent reducing performance, install the unit so that
louvers of the cabinet are not blocked.
FENCE
AWNING
5. Install the unit a little obliquely outward not to leak the
condensed water into the room (about 1/2" or 1/4 bubble
with level).
FOAM
HEAT
RADIATION
COOLED
AIR
6. Install the unit with its bottom portion 30~60" above the
floor level.
7. Stuff the foam between the top of the unit and the wall to
prevent air and insects from getting into the room.
About 1/2"
Over 20"
8. The power cord must be connected to an independent cir-
cuit. The green wire must be grounded.
9. Connect the drain tube to the base pan hole in the rear
side if you need to drain (consult a dealer).
Plastic hose or equivalent may be connected to the drain
tube.
b
How to use the Reversible Inlet grille
The grille is designed to clean the filter both upward and downward.
(a)
A. BEFORE ATTACHING THE FRONT GRILLE TO THE CAB-
INET, IF YOU WANT TO PULL OUT THE FILTER
UPWARD;
1. Open the inlet grille slightly (a).
2. Turn inside out the front grille (a).
3. Disassemble the inlet grille from the front grille with separating the
hinged part by inserting a straight type screw-driver tip (b).
4. Then, rotate the inlet grille 180 degrees and insert the hooks into
bottom holes of the front grille.
(b)
5. Insert the filter and attach the front grille to the cabinet.
B. IF YOU WANT TO PULL OUT THE FILTER DOWNWARD;
THE GRILLE IS ALREADY DESIGNED FOR THAT WAY.
(c)
Service Manual 8
Installation
Window Requirements
NOTICE All supporting parts should be secured to firm wood, masonry, or metal.
• WINDOW REQUIREMENTS
1. This unit is designed for installation in standard double hung windows with actual opening widths from 29" to 41".
The top and bottom window sashes must open sufficiently to allow a clear vertical opening of 18" from the bot-
tom of the upper sash to the window stool.
1
4
2. The stool offset (height between the stool and sill) must be less than 1 / ".
Installation Kits Contents (some models including installation kit)
Foam strip
(Plain-Back)
Foam-PE
(Adhesive-Backed)
Top retainer bar
Foam-PE
(Adhesive-Backed)
Left frame
curtain
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
SCREWDRIVER(+, -), RULER, KNIFE, HAMMER, PENCIL, LEVEL
• PREPARATION OF CHASSIS
Shipping screws
1. Remove the screws which fasten the cabinet at both sides
and at the back. Keep these two screws which fasten the
cabinet at both sides for later use.
2. Slide the unit out from the cabinet by gripping the base pan
handle and pulling forward while bracing the cabinet.
Figure 1
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.
4. Remove the backing from Foam-PE with 3 holes and attach
it to the bottom of the Top retainer bar.
5. Attach the Top retainer bar onto the top of the cabinet with
3 screws (Type A).
Figure 2
Top retainer bar
Foam-PE
6. Insert the Frame guides into the bottom of the cabinet.
Foam-PE
Figure 3
7. Insert the Frame Curtain into the Top retainer bar and
Frame guides.
Top retainer bar
8. Fasten the curtains to the unit with 10 screws (Type A) at
both sides.
Screw
(Type A)
Screw(Type A)
Frame guide
Figure 4
Service Manual 10
Installation
Cabinet Installation
1. Open the window. Mark a line on the center of the win-
dow stool between the side window stop moldings.
Loosely attach the sill bracket to the support bracket
using the carriage bolt and the lock nut.
Sill
Bracket
Support
Bracket
Carriage
Bolt
(M-Screw)
Lock nut
Figure 5
2. Attach the sill bracket to the window sill using the
screws (Type B).
Machine screw (Type D)
and lock nut
Cabinet
Carefully place the cabinet on the window stool and
align the center mark on the bottom front with the center
line marked window stool.
Track hole
Outer edge
of window
sill
Support
Bracket
Screw(Type B)
Carriage bolt
and lock nut
Sill bracket
Figure 6
3. Using the M-screw and the lock nut, attach the support
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
Window stool
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.
Front angle
Figure 7
Window sash
Top retainer bar
Foam-PE
4. Pull the bottom window sash down behind the Top
retainer bar until they meet.
Cabinet
Frame curtain
Foam-PE
NOTICE
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.
Figure 8
Sash track
2. The cabinet should be installed with a very slight tilt
downward toward the outside.
Front Angle
Screw(Type B)
Figure 9
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.
Screw(Type C)
6. Attach each Frame curtain the window sash by using
screws (Type C). (See Fig. 10)
Figure 10
7. Slide the unit into the cabinet. (See Fig. 11)
CAUTION: For security purpose, rein-
stall screws (Type A) at cabinet's
sides.
Power Cord
Screw (Type A)
Screw
Figure 11
8. Cut the Foam-strip to the proper length and insert
between the upper window sash and the lower window
sash. (See Fig. 12)
Foam-Strip
Figure 12
Window locking
bracket
9. Attach the Window locking bracket with a screw (Type
C). (See Fig. 13)
Figure 13
10. Attach the front grille to the cabinet by inserting the
tabs on the grille into the tabs on the front of the cabi-
net. Push the grille in until it snaps into place. (See
Fig.34)
11. Lift the inlet grille and secure it with a screw (Type A)
through the front grille. (See Fig. 14)
Figure 14
12. Window installation of room air conditioner is now
completed.
Figure 15
Service Manual 12
Installation
Operation
• 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 ven-
tilation lever to the OPEN position.
The damper is opened and room air is exhausted.
CLOSE
VENT
OPEN
REMOTE CONTROLLER
Power
1
Temp
5
Fan Speed
4
2
6
Timer
Mode
3
7
Energy
Saver
Auto
Swing
1. POWER BUTTON
To turn the air conditioner ON, push the button. To turn the air conditioner OFF, push the button again.
This button takes priority over any other buttons.
2. OPERATION MODE SELECTION BUTTON
Everytime you push this button, it will toggle COOL, FAN and HEAT.
3. ON/OFF TIMER BUTTON
Everytime you push this button, timer is set as follows.(1Hour ■ 2Hours ■ 3Hours ■ 4Hours ■ 5Hours ■ 6Hours ■
7Hours ■ 8Hours ■ 9Hours ■ 10Hours ■ 11Hours ■ 12Hours ■ Cancel)
4. FAN SPEED SELECTOR
Everytime you push this button, it is set as follows. (Hi[
] ■ Low[
] ■ Hi[
]....)
5. ROOM TEMPERATURE SETTING BUTTON
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.
6. AUTO SWING
This button can automatically control the air flow direction.
7. ENERGY SAVER
The fan stops when the compressor stops cooling.
Approximately every 3 munutes the fan will turn on and check the room air to determine if cooling is needed.
8. REMOCON SIGNAL RECEIVER
CAUTION: A slight heat odor may come from the unit when first switching to
HEAT after the cooling season is over. This odor, caused by fine dust particles on
the heater, will disappear quickly.
13 Room Air Conditioner
Disassembly
Disassembly
- Before the following disassembly, power switch is set to off and disconnected the power cord.
Mechanical parts
1. Front grille
1. Open the inlet grille upward or downward.
2. Remove the screw which fastens the front grille.
3. Pull the front grille from the right side.
4. Remove the front grille. (See Fig. 16)
5. Re-install the component by referring to the
removal procedure.
NOTICE Mark ∆ of inlet grille means opening direction.
2. Cabinet
1. After disassembling the front grille, remove the screws
which fasten the cabinet at both sides. Keep these for
later use.
2. Remove the two screws which fasten the cabinet at
back. (See Fig. 17)
3. Pull the base pan forward.
Figure 16
3. Control box
1. Remove the front grille. (Refer to section 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 Fig. 18)
3. Remove the 3 screws which fasten the controlbox.
(See Fig. 18)
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.
Figure 17
7. Re-install the components by referring to the removal
procedure. (See Fig. 18)
(Refer to the wiring diagram found on page 29~30 in this
manual and on the control box.)
Figure 18
Service Manual 14
Disassembly
Air handling parts
4. Cover (at the top)
1. Remove the front grille. (Refer to section 1)
2. Remove the cabinet. (Refer to section 2)
3. Remove 11 screws which fasten the brace and covers.
4. Remove the covers and the brace. (See Fig. 19)
5. Re-install the components by referring to the removal
procedure, above.
Figure 19
5. Blower
1. Remove the cover. (Refer to section 4)
2. Remove the 3 screws which fasten the evaporator at the
left side and the top side.(See Fig. 19)
3. Move the evaporator sideward carefully.
4. Remove the 2 terminals carefully(See Fig. 20).
Figure 20
5. Remove the 3 screws which fasten the Heater Cover.
(See Fig. 20)
6. Remove the Heater Cover.(See Fig. 20)
7. Remove the orifice from the air guide carefully. (See Fig. 21)
8. Remove the clamp which secures the blower with plier.
(See Fig. 21)
9. Remove the blower with plier or your hand without
touching blades. (See Fig. 22)
10. Re-install the components by referring to the removal
procedure, above.
Figure 21
Figure 22
15 Room Air Conditioner
Disassembly
6. Fan
1. Remove the cabinet. (Refer to section 2)
2. Remove the brace and shroud cover.
(Refer to section 4)
3. Remove the side cover with 2 screws.(See Fig. 23)
4. Remove the 5 or 6 screws which fasten the condenser.
5. Move the condenser sideways carefully.
6. Remove the clamp which secures the fan.
7. Remove the fan. (See Fig. 23)
Figure 23
Figure 24
Figure 25
8. Re-install the components by referring to the removal
procedure, above.
7. Shroud
1. Remove the fan. (Refer to section 6)
2. Remove the 2 screws which fasten the shroud.
3. Remove the shroud. (See Fig. 24)
4. Re-install the component by referring to the removal
procedure, above.
Electrical parts
8. Motor
1. Remove the cabinet. (Refer to section 2)
2. Remove the cover control and disconnect a wire hous-
ing in control box. (Refer to section 3)
3. Remove the blower. (Refer to section 5)
4. Remove the fan. (Refer to section 6)
5. Remove the 4 screws which fasten the motor. (See Fig.
25)
6. Remove the motor.
7. Re-install the components by referring to the removal
procedure, above.
9. Compressor
1. Remove the cabinet. (Refer to section 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, unbraze the suction
and discharge tubes at the compressor connections.
5. Remove the 3 nuts and the 3 washers which fasten the
compressor. (See Fig. 26)
Figure 26
6. Remove the compressor.
7. Re-instill the components by referring to the removal
procedure, above.
Service Manual 16
Disassembly
10. CAPACITOR
1. Remove the control box. (Refer to section 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 Fig. 27)
5. Remove the screw and the clamp which fastens the
capacitor. (See Fig. 27)
6. Disconnect all the leads of capacitor terminals.
7. Re-install the components by referring to the removal
procedure, above.
Figure 27
11. POWER CORD
1. Remove the control box. (Refer to section 3)
2. Unfold the control box. (Refer to section 10)
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 Fig. 28)
7. Re-install the component by referring to the removal
procedure, above.
(Use only one ground-marked hole for ground connec-
tion.)
Figure 28
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.)
12. THERMISTOR
1. Remove the control box. (Refer to section 3)
2. Unfold the control box. (Refer to section 10)
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 30)
Figure 29
17 Room Air Conditioner
Disassembly
13. SYNCHRONOUS MOTOR
1. Remove the control box. (Refer to section 3)
2. Unfold the control box. (Refer to section 10)
3. Remove the crankshaft.
4. Disconnect all the leads of the synchronous motor.
5. Remove the 2 screws which fasten the synchronous
motor. (See Fig. 30)
6. Re-install the components by referring to the removal
procedure, above.
Figure 30
Service Manual 18
Disassembly
Refrigeration cycle
CAUTION: 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.
16. CONDENSER
1. Remove the cabinet. (Refer to section 2)
2. Remove the brace and the shroud cover.
(Refer to section 4)
3. Remove 2 screws which fasten the side cover.(See Fig.
31)
4. Remove the 5 or 6 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 the components by referring to notes.
(See Fig. 31)
Figure 31
17. EVAPORATOR
1. Remove the cabinet. (Refer to section 2)
2. Remove the top cover and the brace.
(Refer to section 4)
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 Fig. 32)
18. CAPILLARY TUBE
1. Remove the cabinet. (Refer to section 2)
2. Remove the brace. (Refer to section 4)
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 32
19 Room Air Conditioner
NOTICE
- Replacement of the refrigeration cycle.
1. When replacing the refrigeration cycle, be sure to
discharge the refrigerant system using a FreonTM
recovery System.
6. Recharge as follows :
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.
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. After discharging the unit completely, remove the
desired component, and unbrace the pinch-off tubes.
2) Connect the charging cylinder as shown in Fig.
35B.
3. Solder service valves into the pinch-off tube ports,
leaving the valves open.
With valve C open, discharge the hose at the
manifold connection.
4. Solder the pinch-off tubes with Service valves.
5. Evacuate as follows.
3) Open valve A and allow the proper charge to
enter the system. Valve B is still closed.
1) Connect the vacuum pump, as illustrated Fig. 35A.
2) Start the vacuum pump, slowly open manifold
valves A and B with two full turns counterclock-
wise and leave the valves 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.
The vacuum pump is now pulling through valves A
and B up to valve C by means of themanifold
and entire system.
a. Do not add the liquid refrigerant to the Low-
side.
b. Watch the Low-side gauge; allow pressure to
rise to 30 lbs.
CAUTION: If high vacuum equip-
ment is used, just crack valves A
and B for a few minutes, then
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.
open slowly with the two full turns coun-
terclockwise. This will keep oil from
foaming and being drawn into the vacu-
um 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 cut-
ter, cut the pinch-off tube about 2 inches from the
pinch-off tool. Use sil-fos solder and solder pinch-
off tube closed. Turn off the unit, allow it to set for
a while, and then test the leakage of the pinch-off
connection.
3) Operate the vacuum pump for 20 to 30 minutes,
until 600 microns of vacuum is obtained. Close
valves A and B, and observe vacuum gauge for
a few minutes. A rise in pressure would indicate a
possible leak or moisture remaining in the sys-
tem. With valves A and B closed, stop the vacu-
um pump.
4) Remove the hose from the vacuum pump and
place it on the charging cylinder. See Fig. 35B.
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 31B-Charging
Figure 31A-Pulling Vacuum
21 Room Air Conditioner
Schematic Diagram
Schematic Diagram
Wiring Diagram
■ ELECTRIC HEATING MODEL
Service Manual 22
Troubleshooting Guide
Troubleshooting Guide
Piping System
CONDENSER COIL
FAN
CAPILLARY TUBE
COMPRESSOR
MOTOR
BLOWER
EVAPORATOR COIL
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 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 32
23 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.
Clean condenser.
Dirty indoor coil
(Heat exchanger)
Check gas leakage.
Repair gas leak.
Not on separate circuit.
Malfunction of fan
Clogged of air filter.
Check inside gas
pressure.
Replacement of unit if the
unit is beyond repair.
Obstruction at air outlet
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 24
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)
25 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.
Blower
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 26
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.
Capacitor (Discharge
Check the capacitor.
capacitor before servicing.)
Replace if not within ±10% of manufacturers rat-
ing. Replace if shorted, open, or damaged.
Compressor
Overload
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 tem-
perature is high, remove the overload, cool it, and
retest.)
Voltage
Compressor cycles on
overload.
Check the voltage.
If not within limits, call an electrician.
Overload
Check overload, if externally mounted.
Replace if open. (If the compressor temperature is
high, remove the overload, cool, and retest.)
Fan motor
If not running, determine the cause. Replace if
required.
Compressor cycles on
overload.
Condenser air flow restric-
tion
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 fins (damaged)
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.
Capacitor
Test capacitor.
Compressor cycles on
overload.
Wiring
Check the terminals. If loose, repair or replace.
Check the system for a restriction.
If restricted, clean of replace.
Close if open.
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.
Blower or fan
Copper tubing
Excessive noise
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 carefully and rearrange tubing
not to contact cabinet, compressor, shroud, and
barrier.
Auto air-swing fails.
Rotary switch.
Set the knob to HIGH COOL or LOW COOL while
rocker switch is ON.
Wiring
Check terminals. If loose, repair or replace.
Check the synchronous motor for open circuit.
Synchronous motor.
27 Room Air Conditioner
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