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5EG-123A
SERVICE MANUAL
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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
Heat
Model
REG-71A
REG-123A
Dimension
W
H
mm(inch)
mm(inch)
mm(inch)
471(18 9/16)
352(13 7/8)
525(20 11/16)
600(23 5/8)
380(14 31/22)
576(22 1/16)
D
Service Manual 5
Specfications
Product Specifications
MODELS
REG-71A
REG-123A
ITEMS
1Ø,115V, 60Hz
1Ø, 208/230V, 60Hz
11,500/12,000
1,170/1,220
5.5/5.8
POWER SUPPLY
COOLING CAPACITY
INPUT
6,900
710
(Btu/h)
(W)
6.6
RUNNING CURRENT
E.E.R
(A)
9.7
9.8/9.8
(BTU/W.h)
(Btu/h)
3850
1,260
11.0
9,200/11,200
2,900/3,500
14.0/15.3
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)**
8.3 (DB)* 6.1 (DB)**
OPERATING
CONDITION
HEATING
385(13.6 oz)
605(21.3 oz)
REFRIGERANT (R-22) CHARGE
EVAPORATOR
2ROW 14STACKS
2ROW 16STACKS
2ROW 13STACKS
2ROW 17STACKS
CONDENSER
BLOWER
FAN, INDOOR
PROPELLER TYPE FAN WITH SLINGER-RING
1 / 2 / 2
FAN, OUTDOOR
FAN SPEEDS, FAN/COOLING/HEATING
FAN MOTOR
6 POLES
TOUCH PANEL
OPERATION CONTROL
ROOM TEMP. CONTROL
THERMISTOR
VERTICAL LOUVER(RIGHT&LEFT)
HORIZONTAL LOUVER(UP&DOWN)
SLIDE IN-OUT CHASSIS
AIR DIRECTION CONTROL
CONSTRUCTION
ELECTRIC HEATER
COMPRESSOR
1.2KW, 115V
3.5KW, 230V
OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
FUSE LINK, BIMETAL THERMOSTAT
PROTECTOR
FAN MOTOR
ELECTRIC HEATER
1.6m(3 WIRE WITH GROUNDING)
POWER CORD
ATTACHMENT PLUG(CORD-CONNECTED TYPE)
DRAIN PIPE OR SPLASHED BY FAN SLINGER
DRAIN SYSTEM
NET WEIGHT
60/27
87/39
(lbs/kg)
18 X 13 7/8 X 20 11/16
23 5/8 X 14 31/22 X 22 5/16
OUTSIDE DIMENSION
(W x H x D)
(inch)
(mm)
470 X 353 X 525
600 X 380 X 525
* 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
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 12" 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
ABOUT 1/2"
Over 20"
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
1
than the front (about /2"). This will help force condensed
water to the outside.
5.Install the unit from the bottom about 30"~60" 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(When using 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 7
Installation
How to Install(Models without Installation Kit)
1. Remove the screws that fasten the cabinet
at both sides and at the back.
Shipping screws
On
/Of
f
On
/Of
f
Fa
n
Co
ol
TI
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ER
EN
ER
GY
H
eat
SA
VE
R
M
OD
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2. Slide the unit from the cabinet by gripping
the base pan handle and pulling forward
while bracing the cabinet.
On
/O
ff
On
/O
ff
Fa
n
Co
ol
TIM
ER
EN
H
ER
eat
GY
SA
VE
R
M
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DE
3. Remove EPS Material.
EPS Material
On
/Of
f
On
/Of
f
Fan
M
Co
ol
TIM
ER
EN
ER
GY
H
eat
SA
VE
R
OD
E
4. Slide the unit into the cabinet.
CAUTION: For security pur-
pose, reinstall screw at cabi-
net's sides.
On/
Off
On/
Off
Fan
Coo
l
TIM
ER
E
Hea
NE
t
RG
Y
SA
VE
M
OD
R
E
Power cord
Screw
Screw
5. Attach the front grille to the cabinet by
inserting the tabs on the grille into the tabs
on the fornt of the cabinet. Push the grille in
until it snaps into place.
6. Lift the inlet grille and secure it with a screw
through the front grille.
o
Fn
ff
On/O
e
ff
On/O
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ENERGY
SAVER
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8 Room Air Conditioner
Installation
How to Install(Models with Installaion Kit)
When Using Gasket
REG-123A
A
2
A
1
2
RIGHT SIDE
B
B
H
HORIZONTAL
LINE
3
D
E
4
I
F
1. WINDOW (WIDTH-A, HEIGHT-B)
2. GASKET
3. WALL
4. DETAILS 5.1 x 30 ROUND HEAD WOOD
SCREWS
A
B
C
D
E
F
H
I
625mm
392mm
280mm
30mm
0~25mm
(0~1")
OVER 420mm
5~10mm
-5~5mm
5
7
1
1
17
3
3
3
3
(24 /8")
(15 /16")
(11 /32")
(1 /16")
(OVER 16 /32")
( /16"~ /8") (- /16"~ /16")
When Using Installation Kits
1. Window Requirements
27" to 39"
16" min
This unit is designed for installation in
standard double hung windows with actual opening
widths from 27" to 39".
Stool
Offset
1
/
2
" to 11
/
4"
The top and bottom window sash must open suffi-
ciently to allow a clear vertical opening of 16" from the
bottom of the upper sash to the window stool.
Sill
Exterior
Interior wall
235
2. Installation Kits Contents
/
8" min
(Without frame curtain)
NO.
1
2
3
4
NAME OF PARTS
Q'TY
2
2
2
2
2
3
7
4
8
1
FRAME CURTAIN
SILL SUPPORT
BOLT
NUT
5
6
SCREW(TYPE A) (10mm(2/5"))
16
3
11
9
5
6
D5.1mm(0.2")/16mm(0.63")
SCREW(TYPE B)
D4.1mm(0.17")/16mm(0.63")
7
SCREW(TYPE C)
5
8
FOAM-STRIP
1
9
FOAM-PE (920mm x 30mm x 2mm)
UPPER GUIDE
FOAM-PE (600mm x 25mm x 2mm)
FRAME GUIDE
WINDOW LOCKING BRACKET
DRAIN PIPE
1
1
1
2
1
1
13
10
11
12
13
14
14
12
■ Top retainer bar is in
10
the product package.
Service Manual 9
Installation
REG-71A
A
2
A
1
2
G
RIGHT SIDE
B
B
C
On/Off
On/Off
Fan Cool
Heat
ENERGY
SAVER
TIMER
MODE
J H
HORIZONTAL
LINE
I
3
4
D
E
F
1. WINDOW (WIDTH-A, HEIGHT-B)
2. GASKET
3. WALL
4. DETAILS 5.1 x 30 ROUND HEAD WOOD
SCREWS
A
B
C
D
E
F
G
H
J
K
495mm 366mm 250mm
30mm 0~25mm OVER 420mm 12mm 32mm
5~10mm
0~5mm
1
7
1
17
1
3
3
3
(19 /2")
(14 /16")
(10")
(1 /16")
(0~1") (OVER 16 /32") (1/2")
(1 /4")
( /16"~ /8")
(0~ /16")
When Using Installation Kits
22" to 36"
1. Window Requirements
This unit is designed for installation in
standard double hung windows with actual opening
widths from 22" to 36".
15" min
(With frame curtain)
Stool
Offset
1/2" to 11/4"
The top and bottom window sash must open suffi-
ciently to allow a clear vertical opening of 15" from
the bottom of the upper sash to the window stool.
Sill
Exterior
Interior wall
181/2" min
(Without frame curtain)
2. Installation Kits Contents
NO.
1
2
3
4
NAME OF PARTS
FRAME CURTAIN
SILL SUPPORT
BOLT
Q'TY
2
2
2
2
2
3
7
4
8
1
NUT
5
6
SCREW(TYPE A) (10mm(2/5"))
16
3
11
9
5
6
D5.1mm(0.2")/16mm(0.63")
SCREW(TYPE B)
D4.1mm(0.17")/16mm(0.63")
7
SCREW(TYPE C)
5
8
FOAM-STRIP
1
9
FOAM-PE (920mm x 30mm x 2mm)
UPPER GUIDE
FOAM-PE (600mm x 25mm x 2mm)
FRAME GUIDE
WINDOW LOCKING BRACKET
DRAIN PIPE
1
1
1
2
1
1
13
10
11
12
13
14
14
12
■ Top retainer bar is in
10
the product package.
10 Room Air Conditioner
Installation
Suggested Tool Requirements
SCREWDRIVER (+, -), RULER, KNIFE, HAMMER, PENCIL, LEVEL
Shipping screws
Preparation of Chassis
1. Remove the screws that fasten the cabinet at both
sides and at the back.
On
/Of
f
2. Slide the unit out from the cabinet by gripping the
base pan handle and pulling forward while
bracing the cabinet.
On
/Of
f
Fan
M
Coo
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TIM
ER
EN
ER
GY
H
eat
SA
VE
R
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E
3. Remove EPS Material.
4. Cut the window sash seal to the proper length. Peel
off the backing and attach the foam-pe
underside of the window sash.
to the
On
/Of
f
On
/Of
f
Fan
M
Coo
l
TIM
ER
EN
ER
GY
H
eat
SA
VE
R
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E
5. Remove the backing from the top upper guide
Foam PE and attach it to the bottom of the upper
guide
.
6. Attach the upper guide onto the top of the cabinet
with 3 type A screws.
EPS Material
7. Insert the frame guides
cabinet.
into the bottom of the
On
/Of
f
On
/Of
f
Fan
M
Coo
l
TIM
ER
EN
ER
GY
H
eat
SA
VE
R
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E
8. Insert the Frame Curtain
into the upper guide
and frame guides
.
10
9. Fasten the curtains to the unit with 4 Type A screws
at the both sides.
11
9
Cabinet Installation
1. Open the window. Mark a line on center of the win-
dow sill(or desired air conditioner location).
Carefully place the cabinet on the window sill and
align the center mark on the bottom front with the
center line marked in the window sill.
10
5
5
(Type A)
12
(Type A)
5
2. Pull the bottom window sash down behind the
upper guide until it meets.
12
NOTICE
Do not pull the window sash down so
tightly that the movement of Frame
Curtain is restricted.
Upper Guide
Window sill
Front Angle
Figure 2
10
Upper guide
Window Sash
Cabinet
1
Frame Curtain
Figure 3
Service Manual 11
Installation
3. Loosely assemble the sill support using the parts
in Figure 4.
INDOOR
OUTDOOR
Sill Support
2
4
Nut
Bolt 3
Figure 4
4. Select the position that will place the sill
support near the outer most point on sill
(See Figure 4)
12
5
Frame Guide
Screw(Type A)
Cabinet
NOTICE
Be careful when you install the cabinet
(Frame Guides
are broken easily).
5. Attach the sill support to the cabinet track hole in
relation to the selected position using
INDOOR
OUTDOOR
2 Type A screws in each support (See Figure 5).
Figure 5
Screw(Type B)
Screw(Type A)
6
5
6. The cabinet should be installed with a very slight
tilt (about 1/2") downward toward the outside
(See Figure 6).
Adjust the bolt and the nut of Sill Support for bal-
ancing the cabinet.
Sill support
2
Sash track
7. Attach the cabinet to the window stool by
driving the screws
(Type B) through the front
angle into window stool (5/8").
Front Angle
8. Pull each Frame Curtain properly to each window
sash track, and repeat step 2.
Screw(Type B)
6
Sill support
2
Figure 6
9. Attach each Frame Curtain to the window sash by
using screws
(Type C).(See Figure 7)
Type C
7
Figure 7
12 Room Air Conditioner
Installation
10. Slide the unit into the cabinet.(See Fig. 8)
CAUTION: For security purpose, reinstall
screws (Type A) at the cabinet's sides.
On/O
ff
Power cord
On/O
ff
Fan
Coo
H
l
TIME
R
EN
ERG
eat
SAV
Y
ER
MO
DE
Screw(Type A)
Figure 8
Screw(Type A)
11. Cut the Foam-Strip
to the proper length and insert
between the upper and lower window sash.
(See Fig. 9)
Foam-Strip
8
Figure 9
13
12. Attach the window Locking Bracket
screw. (See Fig. 10)
with a type C
Figure 10
13. Attach the front grille to the cabinet by inserting the
tabs on the grille into the tabs on the front of the cab-
inet. Push the grille in until it snaps into place.
(See Fig. 11)
Coo
Fan
OO
Heat
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Figure 12
Figure 11
14. Lift the inlet grille and secure it with a type A screw
through the front grille.(See Fig. 12)
On/Off
On/Off
Fan Cool
Heat
ENERGY
SAVER
TIMER
MODE
Figure 13
Service Manual 13
Operation
Operation
Features
• Designed for COOLING and HEATING.
• 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
• Reliable and efficient rotary compressor
• Side air-intake, side cooled-air discharge.
Control Locations Function of Controls
• 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
1. POWER BUTTON
REG-123A
To turn the air conditioner ON, push the button. To turn the
air conditioner OFF, push the button again.
3
3
2
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.
6
6
3. ON/OFF TIMER BUTTON
Everytime you push this button, timer is set as
follows.(1Hour ■ 2Hours ■ 3Hours ■ 4Hours ■ 5Hours
REG-71A
■ 6Hours ■ 7Hours ■ 8Hours ■ 9Hours ■ 10Hours ■
11Hours ■ 12Hours ■ Cancel)
5
4
4
7
4. FAN SPEED SELECTOR
4
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.
Heat
3
6
2
5
1
6. 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.
7. REMOCON SIGNAL RECEIVER
REMOTE CONTROLLER
REG-123A
Power
REG-71A
8. AUTO SWING
Power
This button can automatically control the air flow direction.
1
1
Temp
Temp
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.
5
5
Fan Speed
Fan Speed
4
2
8
4
2
Timer
Mode
Timer
Mode
3
7
3
7
Energy
Saver
Auto
Swing
Energy
Saver
14 Room Air Conditioner
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 14)
l
i
Figure 14
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 15)
4. Remove the cabinet.
5. Re-install the component by referring to the removal
procedure, above.
On/Off
On/Off
Fa
n
Cool
Heat
TI
M
E
R
E
N
E
R
G
Y
S
A
V
E
R
M
O
D
E
3. Control Box
Figure 15
1. Remove the front grille. (Refer to section 1)
2. Remove the cabinet. (Refer to section 2)
3. Remove the 2 screws that fasten the control box
cover.
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 16)
O
n
/O
ff
O
n
/O
ff
F
a
n
C
H
o
o
l
T
IM
E
R
ENERGY
SAVER
e
a
t
M
O
D
E
(Refer to the circuit diagram found on page 23 in this
manual and on the control box.)
Figure 16
Service Manual 15
Disassembly
Air Handling Parts
4. Air Guide and Turbo Fan
1. Remove the front grille. (Refer to section 1)
2. Remove the cabinet. (Refer to section 2)
3. Remove the control box. (Refer to section 3)
4. Remove the 4 screws that fasten the brace.
5. Remove the brace.
6. Remove the 2 screws that fasten the evaporator.
7. Move the evaporator forward and pulling it upward
slightly. (See Figure 17)
On
/O
ff
On
/O
ff
Fa
n
Co
ol
TIM
ER
EN
ER
H
ea
G
t
Y
SA
VE
R
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O
D
E
8. Move the evaporator to the left carefully.
9. Remove the 2 terminals carefully. (See Figure 18,
at Electric heater Model)
Figure 17
10. Remove the 3 screws that fasten the Heater
Cover. (See Figure 18, at Electric Heater Model)
11. Remove the Heater cover. (See Figure 18, at
Electric Heater Model)
12. Pull out the hook of orifice by pushing the tabs
and remove it. (See Figure 19)
13. Remove the clamp with a hand plier that secures
the blower.
14. Remove the blower.
15. Remove the 4 screws that fasten the air guide
from the barrier.
16. Move the air guide backward, pulling out from
the base pan.
Figure 18
17. Re-install the components by referring to the
removal procedure, above.
5. FAN
1. Remove the cabinet. (Refer to section 2)
2. Remove the brace (Refer to section 4)
3. Remove the 4 screws that fasten the condenser.
4. Move the condenser to the left carefully.
5. Remove the clamp that secures the fan.
6. Remove the fan. (See Figure 20)
Figure 19
7. Re-install by referring to the removal procedure.
Figure 20
16 Room Air Conditioner
Disassembly
6. Shroud
1. Remove the fan. (Refer to section 5)
2. Remove the screw that fastens the shroud.
3. Remove the shroud. (See Figure 21)
4. Re-install the component by referring to the
removal procedure, above.
Figure 21
Electrical Parts
7. Overload Protector
1. Remove the cabinet. (Refer to section 2)
2. Remove the nut that fastens the terminal cover.
3. Remove the terminal cover. (See Figure 22)
4. Remove all the leads from the overload protec-
tor.
5. Remove the overload protector.
6. Re-install the component by referring to the
removal procedure, above.
8. Compressor
Figure 22
1. Remove the cabinet. (Refer to section 2)
2. Discharge the refrigerant system using a
Freon™ Recovery System.
If there is no valve to attach the recovery sys-
tem, install one (such as a Watco A-1) before
venting the Freon™.. Leave the valve in place
after servicing the system.
3. Remove the overload protector. (Refer to sec-
tion 7)
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 that
fasten the compressor.
6. Remove the compressor. (See Figure 23)
7. Re-install the components by referring to the
removal procedure, above.
Figure 23
Service Manual 17
Disassembly
9. Capacitor
1. Remove the control box. (Refer to section 3)
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 24)
10. Power Cord
Figure 24
1. Remove the control box. (Refer to section 3)
2. Open the control box. (Refer to section 9)
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 25)
6. Remove the power cord.
7. Re-install the component by referring to the
above removal procedure, above.
(Use only one ground-marked hole
connection.)
for ground
Figure 25
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 3)
2. Open the control box. (Refer to section 6)
3. Disconnet the thermistor terminals from main
P.W.B assembly.
4. Remove the thermistor.
5. Re-install the components by refereing to the
above removal procedure. (See Figure 26)
Figure 26
12. 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. 27)
6. Re-install the components by referring to the
removal procedure, above.
Figure 27
18 Room Air Conditioner
Disassembly
13. Motor
1. Remove the cabinet. (Refer to section 2)
2. Remove the evaporator. (Refer to section 4)
3. Remove the orifice. (Refer to section 4)
4. Remove the blower. (Refer to section 4)
5. Remove the fan. (Refer to section 5)
6. Remove the control box cover and disconnect 5
or 4 wires of motor housing. (Refer to section 3)
7. Remove the 2 or 4 screws that fasten the motor
from the mount motor. (See Figure 28)
Figure 28
8. Remove the motor.
9. Re-install the components by referring to the
removal procedure, above.(See Figure 28)
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.
14. Condenser
1. Remove the cabinet. (Refer to section 2)
2. Remove the 4 screws that fasten the
brace.(Refer to section 4)
Figure 29
3. Remove the 5 screws that fasten the condenser
and shroud.
4. After discharging the refrigerant completely,
unbraze the interconnecting tube at the con-
denser connections.
5. Remove the condenser.
6. Re-install the component by referring to notes.
(See Figure 29)
15. Evaporator
1. Remove the cabinet. (Refer to section 2)
2. Remove the 2 screws that fasten the
evaporator.
3. Move the evaporator sideways carefully.
(Refer to section 4)
4. After discharging the refrigerant completely,
unbraze the interconnecting tube at the evapo-
rator connections.
Figure 30
5. Remove the evaporator.
6. Re-install the component by referring to notes.
(See Figure 30)
Service Manual 19
Disassembly
16. Capillary Tube
3. Remove the capillary tube.
4. Re-install the component by referring to notes.
1. Remove the cabinet. (Refer to section 2)
2. After discharging the refrigerant completely,
unbraze the interconnecting tube at the capil-
lary tube.(See caution above)
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 fig-
ure 31B.
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
manifold connection.
3. Solder service valves into the pinch-off tube ports,
leaving the valves open.
4. Solder the pinch-off tubes with Service valves.
5. Evacuate as follows.
3) Open valve A and allow the proper charge to
enter the system. Valve B is still closed.
4) If more charge is required, the high-side will not
take it. Close valve A.
5) With the unit running, open valve B and add the
balance of the charge.
1) Connect the vacuum pump, as illustrated figure
31A.
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 pressure to drop.
d. Repeat steps b. and c. until the balance of the
charge is in the system.
2) Start the vacuum pump, slowly open manifold
valves A and B with two full turns counterclock-
wise and leave the valves open.
The vacuum pump is now pulling through valves
A and B up to valve C by means of the manifold
and entire system.
6) When satisfied the unit is operating correctly,
use the pinch-off tool with the unit still running
and clamp on to the pinch-off tube. Using a tube
cutter, cut the pinch-off tube about 2 inches
from the pinch-off tool. Use sil-fos braze and
braze pinch-off tube closed. Turn off the unit,
allow it to set for a while, and then test the leak-
age of the pinch-off connection.
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.
3) Operate the vacuum pump vaccum for 20 to 30
minutes, until 600 microns of vacuum is
obtained. Close valves A and B, and observe
vacuum gauge for a few minutes. A rise in
pressure would indicate a possible leak or
moisture remaining in the system. With valves
A and B closed, stop the vacuum pump.
4) Remove the hose from the vacuum pump and
place it on the charging cylinder. See figure
31B. Open valve C.
Discharge the line at the manifold connection.
5) The system is now ready for final charging.
20 Room Air Conditioner
Disassembly
Equipment needed: Vacuum pump, Charging cylinder, Manifold gauge, Brazing equipment. Pinch-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
Service Manual 21
Schematic Diagram
Schematic Diagram
Wiring Diagram
■ ELECTRIC HEATING MODEL
22 Room Air Conditioner
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
Service Manual 23
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)
24 Room Air Conditioner
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)
Service Manual 25
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
26 Room Air Conditioner
Troubleshooting Guide
REMEDY
COMPLAINT
CAUSE
Thermostat
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.
Service Manual 27
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