Daikin VRVII User Manual

Troubleshooting by Indication on the Remote Controller
348
Check for causes of drop in low
pressure
Referring to the Fault Tree Analysis (FTA) shown below,
probe the defective points.
CHECK 2
Abnormally
dropping low
pressure
(Low
evaporating
temperature)
[In both
cooling and
heating]
(∗2.)
[In cooling]
If the indoor
unit electronic
expansion
valve is
throttled too
much:
(∗3.)
[In heating]
If the outdoor
unit electronic
expansion
valve
excessively
throttled:
(∗4.)
[In cooling]
(∗1.)
Defective low
pressure
sensor
Defective
service
monitor PCB
Defective low
pressure
sensor
Defective hot
gas solenoid
valve
Defective
service
monitor PCB
Defective
compressor
capacity
control
Defective low
pressure
protection
control
Defective low
pressure
control
← Are the electrical
characteristics normal?
← Are the electrical
characteristics normal?
← Are the coil resistance and
insulation normal?
← Are the coil resistance and
insulation normal?
← Check for the thermistor
resistance and connection.
← Check for the thermistor
resistance and connection.
← Is the pressure value
checked with the Service
Checker corresponding to
the measurement value of
the pressure sensor?
← Is the pressure value
checked with the Service
Checker corresponding to
the measurement value of
the pressure sensor?
← Is the pressure value
checked with the Service
Checker corresponding to
the measurement value of
the pressure sensor?
Defective
valve coil
Defective
valve body
Defective gas
pipe thermistor
of indoor unit
Defective liquid
pipe thermistor
of indoor unit
Defective
service
monitor PCB
Defective
indoor unit
electronic
expansion
valve
Defective
control
← Are the coil resistance and
insulation normal?
← Are the electrical
characteristics normal?
← Check for the thermistor
resistance and connection.
Defective
valve coil
Defective
valve body
Defective low
pressure
sensor
Defective
suction pipe
thermistor
Defective
service
monitor PCB
Defective
outdoor unit
electronic
expansion
valve
Defective
control
Defective
electronic
expansion
valve control
A

Daikin VRVII Specifications

General

Brand	Daikin
Model	VRVII
Category	Air Conditioner
Language	English