Mitsubishi SRK20ZSX-W User Manual

'18 • SRK-T-234
-
97
-
'09•SRK-DB-087D
(9) Checking the indoor electrical equipment
(a) Indoor 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 PCB.
Is the fuse burnt out? (3.15 A)
YES
YES
YES
NO
NO
NO
(b) Indoor unit fan motor check procedure
1) Indoor PCB output check
① ④ ⑤
2) Fan motor resistance check
⑥⑤④③②①
⑥⑤④③②①
FM I
DC15V
Indoor 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
Resistance when
normal
①

−
 ③
④ 
−
 ③
⑤ 
−
 ③
⑥ 
−
 ③
Defrost operation is performed for 10 minutes at approx. 35 minutes.
Defrost operation is performed for 10 minutes at approx. 35 minutes.
k
M
Compressor stop.
Defrost operation
The compressor cannot pick up its speed owing to the current
safe so that the designed capacity is not achieved.
The compressor cannot pick up its speed owing to the heating
overload protection so that the designed capacity is not achieved.
'09•SRK-DB-087D
(9) Checking the indoor electrical equipment
(a) Indoor 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 PCB.
Is the fuse burnt out? (3.15 A)
NO
YES
YES
NO
YES
NO
(b) Indoor unit fan motor check procedure
1) Indoor PCB output check
① ④ ⑤
2) Fan motor resistance check
⑥⑤④③②①
⑥⑤④③②①
FM
i
DC15V
Indoor PCB
DC308-336V
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
-
-
(8) Phenomenon observed after shortcircuit, wire breakage on sensor
(a) Indoor unit
Phenomenon
Shortcircuit Disconnected wire
Room temperature
sensor
Cooling
Heating
Heat exchanger
sensor
Cooling
Heating
Humidity sensor
Cooling
Heating
■
Humidity sensor operation
Failure mode Control input circuit reading Air-conditioning system operation
①
②
①②
① ②
Freezing cycle system protection trips and stops the compressor.
circuit
Sensor
Operation
mode

Mitsubishi SRK20ZSX-W Specifications

General

Brand	Mitsubishi
Model	SRK20ZSX-W
Category	Air Conditioner
Language	English