Mitsubishi Heavy Industries SCM40ZF-S User Manual

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97
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Current cut
[Open phase on compressor output
terminal, compressor lock]
Abnormality of outdoor unit
[Compressor malfunction of
insufficient gas (refrigerant)]
Does compressor operation? Is capacitor for compressor normal?
Replace compressor.
Replace heat exchanger sensor
Insufficient gas
Is refrigerant amount normal?
Is heat exchanger sensor resistance
value good?
Is connector for compressor connection
good?
Does trouble persist after charging gas?
Clogged capillary tube or strainer,
defective EEV, etc.
Replace capacitor for compressor.
Correct connection
Check if there are any places where
gas is leaking
YES
YES
NO NO
NO
NO
NO
NO
YES
YES
YES
YES
Current safe stop
[Overload operation, compressor
lock, overcharge]
Secure space for inlet and outlet.
Discharge refrigerant.
Is refrigerant charge quantity adequate?
Is outdoor ventilation condition good?
Inspect compressor.
Defective inverter
YES
YES
NO
NO
YES
YES
YES
NO
NO
YES
NO
● Check compressor wiring visually.
● Check insulation resistance. (1 MΩ or over)
● Check coil wire resistance. (Few Ω)
Does current cut operate when
operating inverter with compressor
wire disconnected?
Is output voltage applied to all 3
phases of power transistor?
Is there any shortcircuit?
Inspect compressor.
Defective inverter
Defective inverter
Secure space for suction
and blow out.
If check results are normal,
compressor is locked.

Mitsubishi Heavy Industries SCM40ZF-S Specifications

General

Brand	Mitsubishi Heavy Industries
Model	SCM40ZF-S
Category	Air Conditioner
Language	English