SiBE281013
Troubleshooting by Remote Controller
Service Diagnosis
173
Check for Factors Causing Wet Operation
Note:
∗
: Reference values for superheat degree to be used in the judgement of wet operation
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Suction pipe superheat degree: 4°C or more
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Discharge pipe superheat degree: 5°C or less
(The values above must be used only for reference purposes. Even it is operated within the range above,
operation may be normal in other conditions.)
CHECK 8
Faulty crankcase heater
Faulty control
Dirty evaporator
Wet operation
Faulty valve coil
Faulty valve body
Faulty low pressure sensor
Faulty suction pipe thermistor
Faulty control PCB
Faulty fan motor
Referring to the Fault Tree Analysis (FTA) shown below, identify the faulty points.
←
Refer to .
←
Is the heat exchanger clogged?
Refrigerant
dwelling
Excessive refrigerant charging
Faulty superheat
degree control
Decreased
evaporation
capacity
Frequent starts and stops of the compressor
Faulty electronic
expansion valve
Decreased
fan airflow
rate
Decre-
ased
fan
output
←
Are the coil resistance
and insulation normal?
←
Are the voltage characteristics normal?
←
Is the connector properly connected?
Are the thermistor resistance
characteristics normal?
←
Is the pressure value checked with
the Service Checker corresponding
to the measurement of the sensor?
←
Can the fan motor be
rotated with hands?
Are the motor coil
resistance and insulation
normal?
Faulty control
PCB (including
capacity setting)
CHECK 9
