Argo ASR525CL Manual

TECHNICAL DATA
& SERVICE MANUAL
INDOOR UNIT: ASR525CL
ASR536CL
ASR548CL
SPLIT SYSTEM AIR CONDITIONER
ASR548CL
0.8180.365.0 10/2004
Model No. Product Code No.
ASR525CL 387006100
387006102
387006101ASR536CL

IMPORTANT!
Please read before installation
This air conditioning system meets strict safety and operating
standards.
For the installer or service person, it is important to install or
service the system so that it operates safely and efficiently.
For safe installation and trouble-free operation, you must:
• Carefully read this instruction booklet before beginning.
• Follow each installation or repair step exactly as shown.
• Observe all local, state and national electrical codes.
• ay close attention to all warning and caution notices given in
this manual.
•The unit must be supplied with a dedicated electrical line.
This symbol refers to a hazard or unsafe practice which can result
in severe personal injury or death.
This symbol refers to a hazard or unsafe practice which can result
in personal injury or product or property damage.
If necessary, et help
These instructions are all you need for most installation sites and
maintenance conditions.
If you require help for a special problem, contact our sale/service
outlet or your certified dealer for additional instructions.
In case of improper installation
The manufacturer shall in no way be responsible for improper
installation or maintenance service, including failure to follow the
instructions in this document.
SPECIAL PRECAUTIONS
• During installation, connect before the refrigerant system and
then the wiring one; proceed in the reverse orden when removing
the units.
When wirin
ELECTRICAL SHOCK CAN CAUSE SEVERE
PERSONAL INJURY OR DEATH. ONLY QUALIFIED,
EXPERIENCED ELECTRICIANS SHOULD ATTEMPT
TO WIRE THIS SYSTEM.
• Do not supply power to the unit until all wiring and tubing are
completed or reconnected and checked, to ensure the grounding.
• Highly dangerous electrical voltages are used in this system.
Carefully refer to the wiring diagram and these instructions when
wiring.
Improper connections and inadequate grounding can cause
accidental injury and death.
•Ground the unit following local electrical codes.
• The Yellow/Green wire cannot be used for any connection
different from the ground connection.
• Connect all wiring tightly. Loose wiring may cause overheating
at connection points and a possible fire hazard.
• Do not allow wiring to touch the refrigerant tubing, compressor,
or any moving parts of the fan.
• Do not use multi-core cable when wiring the power supply and
control lines. Use separate cables for each type of line.
When transportin
Be careful when picking up and moving the indoor and outdoor
units. Get a partner to help, and bend your knees when lifting to
reduce strain on your back. Sharp edges or thin aluminium fins on
the air conditioner can cut your fingers.
When installin ...
• Keep all tubing runs as short as possible.
• Use the flare method for connecting tubing.
• Apply refrigerant lubricant to the matching surfaces of the flare
and union tubes before connecting them; screw by hand and
then tighten the nut with a torque wrench for a leak-free
connection.
• Check carefully for leaks before starting the test run.
NOTE:
Depending on the system type, liquid and gas lines may be either
narrow or wide. Therefore, to avoid confusion, the refrigerant
tubing for your particular model is specified as narrow tube for
liquid, wide tube for gas.
When servicin
• Turn the power OFF at the main power board before opening
the unit to check or repair electrical parts and wiring.
• Keep your fingers and clothing away from any moving parts.
• Clean up the site after the work, remembering to check that no
metal scraps or bits of wiring have been left inside the unit being
serviced.
• Ventilate the room during the installation or testing the refrigeration
system; make sure that, after the installation, no gas leaks are
present, because this could produce toxic gas and dangerous
if in contact with flames or heat-sources.
WARNING
CAUTION
WARNING
… In a ceiling
Make sure the ceiling is strong enough to hold the unit-weight.
It may be necessary to build a strong wooden or metal frame to
provide added support.
… In a room
Properly insulate any tubing run inside a room to prevent
"sweating", which can cause dripping and water damage to
walls and floors.
... In moist or uneven locations
Use a raised concrete base to provide a solid level foundation
for the outdoor unit. This prevents damage and abnormal
vibrations.
... In area with strong winds
Securely anchor the outdoor unit down with bolts and a metal
frame. Provide a suitable air baffle.
... In a snowy area (for heat pump-type systems)
Install the outdoor unit on a raised platform that is higher then
drifting snow. Provide snow vents.
When connecting refrigerant tubing
2

Page
1. SPECIFICATIONS 4
1-1 Unit specifications 4
1-2 Major Component specifications 7
1-3 Other Component specifications 10
2. DIMENSIONAL DATA 11
3. ELECTRICAL DATA 13
3-1 Electric Wiring Diagram 13
3-1 Schematic Diagram 14
4. FUNCTION 15
4-1 Room Temperature Control 15
4-2 Freeze Prevention 16
5. TROUBLESHOOTING 17
6. CHECKING ELECTRICAL COMPONENTS 29
6-1 Measurement of Insulation Resistance 29
6-2 Checkin
g
Continuit
y
of Fuse on PCB Ass'
y
30
6-3 Checking Motor Capacitor 30
6-4 Thermistor Characteristic Curve 31
Table of Contents
3

1. SPECIFICATIONS
1-1 Unit Specifications
ASR525CL
Power source
V
olta
g
e ratin
g
Performance
Capacity
Air circulation (High/Med./Low) m³/h
Features
Controls/Temperature controls
Remote Controller
Timer
Fan speed
Airflow direction
Air Filter
Operation sound High/Med./Low dB-A
Refrigerant tubing connections
Refrigerant Narrow tube mm(in.)
tube diameter Wide tube mm(in.)
Refrigerant
Refrigerant control
Dimensions & Wei
g
ht
Dimensions (include panel) Height mm
Width mm
Depth mm
Package dimensions Unit Height mm
Width mm
Depth mm
Volume m3
Ceiling panel Height mm
Width mm
Depth mm
Volume m3
Weight (include panel) Net kg
Shipping kg
Ceiling panel Net kg
Shipping kg
DATA SUBJECT TO CHANGE WITHOUT NOTICE
Wireless remote control unit
ON/OFF 24 hours & Daily program, 1-hour OFF
320
338
A
uto (Remote control)
Capillary tube
Washable, easy acces, long life (2500 hr.)
37/35/31
Flare type
6
110
965
840
965
8
220 - 240V ~ 50H
z
230V
880
0,1
22
26
860
860
0,238
15,88 (5/8)
R407C
Microprocessor/ I.C. thermostat
3 and Auto
See catalogue with the requested matching
1140/1020/840
Cooling
6,35 (1/4)
4

ASR536CL
Power source
V
olta
g
e ratin
g
Performance
Capacity
Air circulation (High/Med./Low) m³/h
Features
Controls/Temperature controls
Remote Controller
Timer
Fan speed
Airflow direction
Air Filter
Operation sound High/Med./Low dB-A
Refrigerant tubing connections
Refrigerant Narrow tube mm(in.)
tube diameter Wide tube mm(in.)
Refrigerant
Refrigerant control
Dimensions & Wei
g
ht
Dimensions (include panel) Height mm
Width mm
Depth mm
Package dimensions Unit Height mm
Width mm
Depth mm
Volume m3
Ceiling panel Height mm
Width mm
Depth mm
Volume m3
Weight (include panel) Net kg
Shipping kg
Ceiling panel Net kg
Shipping kg
DATA SUBJECT TO CHANGE WITHOUT NOTICE
10
0,131
27
32
840
0,35
Washable, easy acces, long life (2500 hr.)
8
110
1250
965
19,05 (3/4)
350
1170
A
uto (Remote control)
42/39/35
Flare type
9,52 (3/8)
R407C
Capillary tube
860
1150
368
220 - 240V ~ 50H
z
230V
Cooling
See catalogue with the requested matching
3 and Auto
ON/OFF 24 hours & Daily program, 1-hour OFF
Microprocessor/ I.C. thermostat
1920/1680/1320
Wireless remote control unit
5

ASR548CL
Power source
V
olta
g
e ratin
g
Performance
Capacity
Air circulation (High/Med./Low) m³/h
Features
Controls/Temperature controls
Remote Controller
Timer
Fan speed
Airflow direction
Air Filter
Operation sound High/Med./Low dB-A
Refrigerant tubing connections
Refrigerant Narrow tube mm(in.)
tube diameter Wide tube mm(in.)
Refrigerant
Refrigerant control
Dimensions & Wei
g
ht
Dimensions (include panel) Height mm
Width mm
Depth mm
Package dimensions Unit Height mm
Width mm
Depth mm
Volume m3
Ceiling panel Height mm
Width mm
Depth mm
Volume m3
Weight (include panel) Net kg
Shipping kg
Ceiling panel Net kg
Shipping kg
DATA SUBJECT TO CHANGE WITHOUT NOTICE
3 and Auto
ON/OFF 24 hours & Daily program, 1-hour OFF
See catalogue with the requested matching
Microprocessor/ I.C. thermostat
1920/1680/1320
Wireless remote control unit
220 - 240V ~ 50H
z
230V
Cooling
R407C
A
uto (Remote control)
42/39/35
Flare type
9,52 (3/8)
Capillary tube
860
1150
368
840
0,35
Washable, easy acces, long life (2500 hr.)
8
110
1250
965
19,05 (3/4)
350
1170
10
0,131
27
32
6

1-2 Major Component Specifications
ASR525CL
Controller PCB
Part No.
Controls
Fan & Fan Motor
Type
Q'ty ……. Diameter mm
Fan motor model…Q'ty
No. Of poles…rpm (230 V, High)
Running Amps A
Power input W
Coil resistance (Ambient temp. 20 °C ) ΩBRN-WHT: 170,3
WHT-VLT: 18,1
VLT-ORG: 43,2
ORG-YEL: 43,2
WHT-PNK: 83,5
YEL-BLK: 60,2
Safety devices Type
Operating temp. Open °C
Close °C
Run capacitor µF
VAC
Panel
Model
Flap motor
rating
rpm
nominal output W
coil resistance (25°C) kΩ
Dew proof heater
Heat Exch. Coil
Coil
Rows
Fin pitch mm
face area m2
DATA SUBJECT TO CHANGE WITHOUT NOTICE
440
0,343
A
luminium plate fin / Copper tube
1,5
2
A
SG25SCE
M2LB24ZA12
240 VAC
Centrifugal fan
SFG6X-41D6P…1
6 … 470
1…. Ø 443
Microprocessor
CR-XR254GS
0,611
31,4
4,5
Internal thermal protector
130 ± 8
79 ± 15
240 V, 26W
2,5
3
15,62 ± 15%
7

ASR536CL
Controller PCB
Part No.
Controls
Fan & Fan Motor
Type
Q'ty ……. Diameter mm
Fan motor model…Q'ty
No. Of poles…rpm (230 V, High)
Running Amps A
Power input W
Coil resistance (Ambient temp. 20 °C ) ΩBRN-WHT: 75,1
WHT-VLT: 6,7
VLT-ORG: 20,6
ORG-YEL: 27,4
WHT-PNK: 42,7
YEL-BLK: 58
Safety devices Type
Operating temp. Open °C
Close °C
Run capacitor µF
VAC
Panel
Model
Flap motor
rating
rpm
nominal output W
coil resistance (25°C) kΩ
Dew proof heater
Heat Exch. Coil
Coil
Rows
Fin pitch mm
face area m2
DATA SUBJECT TO CHANGE WITHOUT NOTICE
440
Internal thermal protector
130 ± 8
79 ± 15
5
2
1,5
0,556
A
luminium plate fin / Copper tube
SFG6X-81A6P…1
6 … 530
0,765
38
A
SG3648E
CR-XR254GS
Centrifugal fan
Microprocessor
1…. Ø 443
3
15,62 ± 15%
240 V, 26W
M2LB24ZA12
240 VAC
2,5
8

ASR548CL
Controller PCB
Part No.
Controls
Fan & Fan Motor
Type
Q'ty ……. Diameter mm
Fan motor model…Q'ty
No. Of poles…rpm (230 V, High)
Running Amps A
Power input W
Coil resistance (Ambient temp. 20 °C ) ΩBRN-WHT: 75,1
WHT-VLT: 6,7
VLT-ORG: 20,6
ORG-YEL: 27,4
WHT-PNK: 42,7
YEL-BLK: 58
Safety devices Type
Operating temp. Open °C
Close °C
Run capacitor µF
VAC
Panel
Model
Flap motor
rating
rpm
nominal output W
coil resistance (25°C) kΩ
Dew proof heater
Heat Exch. Coil
Coil
Rows
Fin pitch mm
face area m2
DATA SUBJECT TO CHANGE WITHOUT NOTICE
2
1,5
0,556
A
luminium plate fin / Copper tube
130 ± 8
79 ± 15
6
440
0,871
Internal thermal protector
51,9
Centrifugal fan
1…. Ø 443
SFG6X-81A6P…1
6 … 530
Microprocessor
CR-XR254GS
A
SG3648E
M2LB24ZA12
240 V, 26W
240 VAC
2,5
3
15,62 ± 15%
9

1-3 Other Component Specifications
Trasformer
Rating Primary
Secondary
Capacity
Coil resistance Ω
Thermal cut-off temp.
Thermistor
(
Coil sensor
)
Resistance ΚΩ
Thermistor
(
Room sensor TH1
)
Resistance ΚΩ
Drain pump
Model
Rating Voltage
Input
Total head / capacity
Safet
y
float switch
Model
Contact rating
45 °C 2,2 ± 5%
50 °C 1,8 ± 5%
10 °C 10,0 ± 5%
20 °C 6,3 ± 5%
30 °C 4,0 ± 5%
40 °C 2,7 ± 5%
15 °C 8,0 ± 5%
0 °C 16,5 ± 5%
5 °C 12,8 ± 5%
KTEC-35-S6
55 °C 1,5 ± 5%
PBC-41E-S14
(WHT-WHT): 96,5
(BRN-BRN): 0,8 (at 20°C)
150°C
-10 °C 23,7 ± 5%
-5 °C 18,8 ± 5%
0 °C 15,0 ± 5%
5 °C 12,1 ± 5%
10 °C 9,7 ± 5%
A
TR-II215T
A
VAC 230V, 50H
z
10,6V - 0.93
A
7 V
A
PJV-1434
A
230V
12W
DC 5V - 50W
500 mm / 400 cc/min.
FS-0218-102
10

2. DIMENSIONAL DATA
ASR525CL
Units: mm
12
776
225
8
12
X-view
124
124
7
5
6292
232
100
339
221
59
157
182
261
860 500
500
860
2
2
1
221
308 30
48
124
124
1212 100
776
7
34
566 (Suspention bolt pitch)
820 (Ceiling opening)
820 (Ceiling opening)
377
Panel center
757 (Suspention bolt pitch)
368 25
9
X
Air intake grille
Air outlet
Refrigerant liquid line [D. 9.52 (In case of 25 typ
e
,
use the tube connector.)]
Refrigerant gas line
D. 12.7: 9, 12 type
Drain connection
Power supply entry
For discharge duct
For fresh air intake
Suspension bolt mounting
9
11

ASR536CL
ASR548CL
856 (Suspention bolt pitch)
820 (Ceiling opening)
1110 (Ceiling opening)
522
Panel center
757 (Suspention bolt pitch)
513 25
9
8
83
2
2
1
4
X
X-view
124
124
124
338 30
48
124
1066
12 100
12
1212
244
249
776 180 57
6
244
182
157
59
291
292 339
232
790
1150
860
500
Air intake grille
Air outlet
Refrigerant liquid line (D.9.52)
Refrigerant gas line (D.19.05)
Drain connection
Power supply entry
For discharge duct
For fresh air intake
Suspension bolt mounting
9
12

3. ELECTRICAL DATA
3-1 Electric Wiring Diagram
21
GRN/YEL
CONTROLLER (CR-XR254GS)
E
FS
COIL
2P (RED)
31
DPH
3P (RED)
31
LM
3P (GRN)
315
1
TO OUTDOOR UNIT
POWER SUPPLY
EARTH
TERMINAL EARTH TERMINAL
EARTH
TERMINAL
TERMINAL PLATE(4P)
2 3 4
GRN/YEL
SUP
5P (WHT) PRY
2P (WHT) SEC
2P (WHT)
21
TR
PS
21 13 13
3175
2134
FS
3P (RED) 49FMI
3P (WHT)
7P (WHT)3P (WHT)
COM
FM M 7P
CONNECTOR 9P(WHT)
CONNECTOR
4P(WHT)
123456789
1
S
P
RC
23456789
YEL ORG VLT WHT GRY GRY PNK BRN BLK ORG
VLT WHT GRY GRY PNK BRN BRN
71
SWITCH
ASSY
IND LAMP
ASSY
71
H L
(WHT)
BLK BLK
13
DP
DP
3P (BLU)
BLK BLK
BRN
WHT
RED
BRN BRN WHT WHT
GRN/YEL
FMI
GRN/YEL
TH1 (COIL)
BLK BLK
21 231
231
ROOM SW ASSY W/LESS
2P (YEL)
TH2 (ROOM)
BLK BLK RED ORG BRN WHT YEL BLK GRY WHT
YEL BLK GRY
21
S
DPH
P34
LM
13

3-2 Schematic Diagram
2
1
TR
TH1
COIL
2
1TH2
ROOM
3
3
5
F01 (3.15A)
2
1
2
1
1
RY04
RY01
RY05
RY08
RY06
RY02
RY03
4P-2
4P-4
1
4P-1
RY02
FMI
RC
12
1
735
456
RY05
RY04
RY06
H
DPH
LM
9
49FMI
8 1
3
RY01
SYMBOLS DESCRIPTION
FMI
49FMI
RC
F01
DP
LM
TR
RY01-RY06,
RY08
TH1
TH2
INDOOR FAN MOTOR
INDOOR MOTOR THERMAL PROTECTOR
RUNNING CAPACITOR
FUSE
DRAIN PUMP
DPH DEW PROOF HEATER
AUTO LOUVER MOTOR
FS FLOAT SWITCH
POWER TRANSFORMER
AUXILIARY RELAY
THERMISTOR (INDOOR COIL)
ROOM THERMISTOR
CR-X254GS
IND
INDOOR CONTROLLER
INDICATOR LAMP ASSY
SW SWITCH ASSY
TERMINAL PLATE
CONNECTOR
TERMINAL
CR-XR254GS
CONTROLLER
FS
3
1
DP
3
1
RY03
LM
3
42
1
31
RY08
3
1
2
7
1
3
1
2
7
1IND
SW
14

4. FUNCTIONS
4-1 Room temperature control
Room temperature control is obtained by cycling the compressor ON and OFF under control of the room
temperature sensor in the remote control unit.
The room temperature (and other information) is transmitted every 5 minutes by the remote control unit to the
controller in the indoor unit.
The control circuit will not attempt to turn the compressor ON until the compressor has been OFF for at least
3 minutes. To protect the compressor from stalling out when trying to start against the high side refrigerant
pressure, the control circuit has a built-in automatic time delay to allow the internal pressure to equalize.
As a protective measure, the control circuit switches the compressor OFF not before than 5 minutes
of compressor operation.
Thermo. ON : When the room temperature is above T + 1°C (T°C is set temperature).
Compressor ON
Thermo. OFF : When the room temperature is equal to or below set temperature T°C.
Compressor OFF
3 minutes5 minutes
ON OFF ON OFF ON OFFCompressor
ON OFF ON OFF ON OFF
More than
5 minutes
Outdoor fan
Indoor fan Set speed
T+1 °C
T°Cset temp.
Thermo.
OFF Thermo. OFF Thermo. ON Thermo. OFF
Thermo.
ON
Thermo.
ON
Thermo.
ON
Room temp.
5 minutes 5 minutes 5 minutes 5 minutes 5 minutes 5 minutes 5 minutes
Signal from remote control unit
3 seconds3 seconds3 seconds 3 seconds
15

4-2 Freeze Prevention
This function prevents freezing of the indoor heat exchange coil.
When the compressor has been running for 6 minutes or more and the temperature of the indoor heat
exchange coil falls below –0.8°C, the control circuit stops the compressor for at least 3 minutes. The
compressor does not start again until the temperature rises above 8°C or 6 minutes has elapsed.
ON ON ON ON
OFFOFF
Set speed
More than
6 minutes
6 minutes
T+1 °C
Indoor heat exch.
coil temp.–0.8°C
Compressor
Indoor fan
Room temp. Thermo. OFF
Thermo. ON
Set temp. T °C
More than
6 minutes
More than
6 minutes
Set speed
16

5. TROUBLESHOOTING
(1) Check before and after troubleshooting
Many problems may occur because of wiring or power supply problems, and so you should check these areas
first. Problems here can cause incorrect results in some of the other tests, and so they should be remedied
first.
1. Check power supply wiring
(a) Single-phase
Check that the power supply wires are correctly connected to terminal No. 1 through No. 4 on the
4P terminal plate on the indoor unit and L and N on the 6P terminal on the outdoor unit.
(b) 3-phase
Check that the power supply wires are correctly connected to terminal No.1 through No. 4 on the
4P terminal plate on the indoor unit and L1 through L3 and N on the 8P terminal on the outdoor
unit.
2. Check the inter-unit wiring
Check that the inter-unit control wires (AC 220 - 240 V Line voltage) are correctly connected
between the indoor unit and outdoor unit.
3. Check the power supply
Check that the voltage is within the specified range ( ±10% of the rating).
Check that power is supplied.
WARNING
If the following troubleshooting must be done with the power being supplied, take care not to touch
any uninsulated live parts that will given an ELECTRIC SHOCK.
4. Check the lead wires and connectors in indoor and outdoor units.
Check that the sheaths of the lead wires are not damaged.
Check that the lead wires are firmly connected to the terminal plate.
Check that the wiring has been performed correctly.
5. Reference
• Condition of general cooling operation (Thermo. ON)
SWEEP..................ON
Indoor fan speed....HIGH
Single-phase outdoor unit 3-phase outdoor unit
1
2
4
1
2
4
L
N
Indoor Unit Outdoor Unit
Ground
Ground
B
A
0611_X_S
L
N
Power supply
Inter-Unit
Wiring
(Line voltage)
1
2
4
1
2
4
L1
N
Indoor Unit Outdoor Unit
Power supply
Inter-Unit
Wiring
(Line voltage)
Ground
Ground
B
AL1
L2 L2
L3 L3
N
17

(2) Air conditioner does not operate
1. Circuit breaker trips (or fuse blows).
(a) When the circuit breaker is set to ON, it trips immedialely.
• There is a possibility of ground fault.
• Check insulation resistance.
If the resistance value is 1M½ or less, insulation is defective.
(Example)
1
2
3
*Set the circuit breaker to OFF.
Remove power supply cords
from terminal plate in outdoor
unit.
•Check insulation resistance
of power supply cords.
OK
NO
NO Insulation of
outdoor unit
is defective.
Rewire
Remove inter-unit power line
from terminal plate in outdoor
unit.
•Check insulation resistance
of outdoor unit.
OK
Remove inter-unit power line
from terminal plate in indoor
unit.
•Check insulation resistance
of indoor unit.
OK
Inter-unit power lines is
defective.
NO Insulation of
indoor unit
is defective.
•Check insulation
resistance of
electrical parts
in outdoor unit.
•Check insulation
resistance of
electrical parts
in indoor unit.
Rewire
+
+
+
++
+
13
2
Circuit
breaker
Outdoor
unit
5 1
6 2
3
4
Indoor
unit
1
2
3
4
Power
supply
cords Interunit
power line
L
N
Earth
+
+
+
+
++
+
+
13
2
Circuit
breaker
Indoor
unit
1
2
Power
supply
cords Interunit
power line
L1
L2
L3
N
Earth
4
+
+
+ +
4
Outdoor
unit
5 1
6
7 2
4
3
84
3
18

(b) Circuit breaker trips in several minutes after turning the air conditioner on.
•There is a possibility of short circuit.
•Check capacity of circuit
breaker. NO
•Check resistance of
outdoor fan motor winding.
Is capacity of circuit
breaker sufficient ?
•Check resistance of
compressor motor winding.
Replace it with a
suitable one.
(= larger capacity)
•Check resistance of louver
motor winding.
Neither indoor unit nor outdoor unit runs.
A. No power is supplied
•Check power supply.
Is power being supplied
to outdoor unit ?
Circuit breaker
is tripped.
Power failure.
Reset the breaker.
Wait for power to
consult power
be restored or
supply company.
NO
B. Check remote control unit.
•Try to run both indoor and
outdoor units with another
remote control unit.
Other remote control
unit is defective.
OK
2
19

C. Check “Operation selector”switch in the indoor unit.
D. Check compressor motor protectors.
a) High pressure switch (63PH)
b) Compressor motor overcurrent relay
•Check high pressure switch.
Is high pressure switch
actuated ? (63PH)
YES
YES
Clean heat exchanger coil
or remove obstructions.
•Is outdoor heat exchanger
coil dirty or are there
obstruction near air suction
inlet of outdoor unit ?
•Check if outdoor fan rotates.
Refer to “Only outdoor fan
does not run.”
NO
Disconnect the socket from the 2P (WHT) connector.
Check the continuity between the No.1 and No.2 poles
of the socket.
•Has “Operation selector”
switch been set to ON
position ? YES
Set “Operation selector”
switch to ON.
NO
Neither unit runs.
Switch Ass’y or P.C.B.
Ass’y in the indoor unit
is defective.
IND. LAMP Ass’y or P.C.B.
Ass’y in the indoor unit
is defective.
•Check compressor motor
overcurrent relay. (51C)
Is it actuated ?
YES
NO
YES
Consult power supply company
and restore voltage to
normal value.
•Check power supply voltage.
Is voltage 90% of rated
voltage or less?
•Following causes may be considered.
Locked rotor of compressor.
Overcharged refrigerant.
Insufficient air for outdoor unit ventilation.
Obstruction in front of outdoor unit.
NO
Refer to “CHECKING ELECTRICAL COMPONENTS
(Electro magnetic contactor)”.
90% of rated
voltage or more.
20