-
67
-
'20 • PAC-SM-351
'09•SRK-DB-087D
(vi) Checking the indoor electrical equipment
1) Indoor unit PCB check procedure
(b) Outdoor unit
Is there voltage between terminal
blocks
①
and
②
? (AC 220/230/240
V)
Indoor electrical components
are normal.
Is the voltage between terminal
blocks
②
and
③
oscillating between
DC 0 and 20V?
Inspect power source
for outdoor unit.
Replace fuse.
Replace indoor unit PCB.
Is the fuse burnt out? (3.15 A)
NO
YES
YES
NO
YES
NO
2) Indoor fan motor check procedure
a) Indoor unit PCB output check
① ④ ⑤
b) Fan motor resistance check
⑥⑤④③②①
⑥⑤④③②①
FM
i
DC15V
Indoor unit PCB
DC 308-336V
DC several V
(4-6 V)
CNU
(–)
GND
Blue
Yellow
White
Black
Red
Sensor
Operation
mode
Phenomenon
Shortcircuit Disconnected wire
Heat exchanger
sensor
Cooling
Heating
Ourdoor air
temperature sensor
Cooling
Heating
Discharge pipe
sensor
All modes
Measuring point Resistance when normal
①
−
③
−
④
−
③
−
Measuring
point
Voltage range when
normal
①
−
③
④
−
③
⑤
−
③
Defrosting is performed for 10 minutes at approx. 35 minutes.
Defrosting is performed for 10 minutes at approx. 35 minutes.
k
M
iii)
ii)
i)
-
-
(vii) Inspection procedure for blown fuse on the indoor unit PCB
Replace the indoor unit PCB and the fan motor. Check then the operation.
Faulty part, other than
fan motor
( )
YES (Fan motor is faulty.)
YES
YES
YES
NO
NO
NO
Replace the faulty part and the
fuse. Test-run then the unit for
checking.
Is there any damage on the internal circuit
of fan motor?
Check the resistance value to judge.
Is the fuse blown on the indoor unit
PCB?
Is there any faulty part (fan motor, etc)?
Replace the fuse on the indoor unit
PCB. When the operation is checked
without connecting the fan motor
connector, does the fuse blow?
Go to the inspection procedure for electric
equipment of indoor unit.
Replace the fuse, and check the operation.
Replace the fan motor, and check the operation.
To Next Page
Loading...
