Mitsubishi SCM80ZJ-S1 User Manual

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68
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'11 • SCM-SM-110
Rotor lock (SCM40, 45, 50, 60, 71, 80 only)
(8) Phenomenon observed after shortcircuit, wire breakage on sensor
(a) Indoor unit
Defective compressor, defective
outdoor PCB
Sensor
Operation
mode
Phenomenon
Shortcircuit Disconnected wire
Room temperature
sensor
Cooling
Heating
Heat exchanger
sensor
Cooling
Heating
Humidity sensor
(1)
Cooling
Heating
■
Humidity sensor operation
Failure mode Control input circuit resding Air conditioning system operation
①
②
①②
① ②
See pages 65.
Note (1) SRK35ZJR-S, 35, 50ZJ-S, 50, 60ZJX-S1, 71ZK-S,SRF25, 35, 50 only
main
Has an overflow developed?
YES
NO NO
NO
NO
YES
YES
Is the float switch operating?
Indoor PCB is
defective.
Inspect float switch.
Repair and clean.
Indoor PCB is defective.
Is there output for drain motor driver?
Is the drain piping clogged or at
the wrong gradient?
Drain motor is defective.
Inspect wiring.
Drain abnormality (SRR only)
[Drain piping defective,pump defect,
float switch, indoor PCB]
(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
⑥ ⑤ ④ ③ ② ①
⑥ ⑤ ④ ③ ② ①
FM I
DC15V
Indoor PCB
DC 280V
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
Defrosting is performed for 10 minutes at approx. 40 minutes.
Defrosting is performed for 10 minutes at approx. 40 minutes.
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Mitsubishi SCM80ZJ-S1 Specifications

General

Brand	Mitsubishi
Model	SCM80ZJ-S1
Category	Air Conditioner
Language	English