Check For Causes Of Wet Operation - Daikin VRVII Manual

Troubleshooting by Indication on the Remote Controller
CHECK 5
Referring to the Fault Tree Analysis (FTA) shown below,
probe the defective points.
Refrigerant
accumulation
Overcharge of
refrigerant
[In cooling]
Indoor unit
electronic
Wet
expansion
operation
valve opens
too much. (∗1)
Defective
control of
superheated
degree
[In heating]
Outdoor unit
electronic
expansion
valve opens
too much. (∗2)
A

Check for causes of wet operation.

Defective crankcase
heater
Frequent ON/OFF of
compressor
Defective
indoor unit
electronic
expansion
valve
Defective
control
Defective
outdoor unit
electronic
expansion
valve
Defective
control
← Refer to [CHECK 11]
← Are the coil resistance and
Defective
valve coil
insulation normal?
Defective
valve body
← Is the connector properly
Defective gas
pipe
connected?
thermistor of
Are the thermistor
indoor unit
resistance characteristics
normal?
← Is the connector properly
Defective
liquid pipe
connected?
thermistor of
Are the thermistor
indoor unit
resistance characteristics
normal?
Defective
service
monitor PCB
← Are the coil resistance and
Defective
valve coil
insulation normal?
Defective
valve body
← Are the electric
Defective low
pressure
characteristics normal?
sensor
← Is the connector properly
Defective
suction pipe
connected?
thermistor
Are the thermistor
resistance characteristics
normal?
← Is the pressure value
Defective
service
checked with the Service
monitor PCB
Checker corresponding to
the measurement value of
the pressure sensor?
357