Daikin ZQG71~140L7V1B Service Manual page 212

Troubleshooting by Remote Controller
CHECK 7
Check for Factors Causing Wet Operation
Referring to the Fault Tree Analysis (FTA) shown below, identify the faulty points.
Refrigerant
dwelling
Excessive refrigerant charging
Faulty superheat
degree control
Wet operation
Decreased
evaporation
capacity
Note:
: Reference values for superheat degree to be used in the judgement of wet operation
200
Faulty crankcase heater
Frequent starts and stops of the compressor
Faulty electronic
expansion valve
Faulty control
Dirty evaporator
Decreased
fan airflow
rate
1 Suction pipe superheat degree: 4°C or more 2 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.)
Faulty valve coil
Faulty valve body
Faulty low pressure sensor
Faulty suction pipe thermistor
Faulty control PCB
← Is the heat exchanger clogged?
Faulty fan motor
Decre-
ased
Faulty control
fan
PCB (including
output
capacity setting)
← Refer to
.
CHECK 8
← 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?
Service Diagnosis
ESIE12-06