Mitsubishi Heavy Industries SRC25ZMP-S Technical Manual page 56

Rotor lock
Rotor lock
(8) Phenomenon observed after shortcircuit, wire breakage on sensor
(8) Phenomenon observed after shortcircuit, wire breakage on sensor
(a) Indoor unit
(a) Indoor unit
Operation
Sensor Operation
Sensor mode
mode
Cooling
Room temperature
Cooling
Room temperature
sensor
Heating
sensor
Heating
Cooling
Heat exchanger
Cooling
Heat exchanger
sensor
sensor
Heating
Heating
Cooling
Cooling
Humidity sensor
Humidity sensor
Heating
Heating
■ Humidity sensor operation
■ Humidity sensor operation
Failure mode
Failure mode
①
①
②
②
①②
①②
① ②
① ②
(b) Outdoor unit
Operation
Sensor
mode
Cooling
Heat exchanger
sensor
Heating
Cooling
Ourdoor air
temperature sensor
Heating
Discharge pipe
All modes
sensor
(9) Checking the indoor electrical equipment
(a) Indoor PCB check procedure
Is there voltage between terminal
blocks ① and ② ? (AC 220/230/240
V)
YES
Is the fuse burnt out? (3.15 A)
YES
Is the voltage between terminal
blocks ② and ③ oscillating between
DC 0 and 20V?
YES
Indoor electrical components
are normal.
(b) Indoor unit fan motor check procedure
Shortcircuit
Shortcircuit
Control input circuit resding
Control input circuit resding
Shortcircuit
NO
Inspect power source
for outdoor unit.
NO
Replace fuse.
NO
Replace indoor PCB.
-
See page 52.
See page 52.
Phenomenon
Phenomenon
Air conditioning system operation
Air conditioning system operation
Phenomenon
Defrosting is performed for 10 minutes at approx. 35 (model SRK35:45) minutes.
Defrosting is performed for 10 minutes at approx. 35 (model SRK35:45) minutes.
55
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'13 • SRK-T-140
Defective compressor, defective
Defective compressor, defective
outdoor PCB
outdoor PCB
Disconnected wire
Disconnected wire
'09•SRK-DB-087D
Disconnected wire