Check For Causes Of Rise In High Pressure - Daikin VRVII Manual

CHECK 1
Referring to the Fault Tree Analysis (FTA) shown below,
probe the defective points.
Local pressure
rise
[In cooling]
If the outdoor
unit electronic
expansion valve
is throttled:
(∗1.)
Rise in
high
pressure
Defective high
pressure
control
[In heating]
If the indoor
unit electronic
expansion
valve
excessively
throttled:
(∗2.)
A
346
Troubleshooting by Indication on the Remote Controller
Check for causes of rise in high
pressure
High pipe
resistance
Defective
outdoor unit
electronic
expansion
valve
A temperature
difference in
excess of 10˚C
between the
inlet and the
outlet is deemed
to be abnormal.
Defective
control
Defective
indoor unit
electronic
expansion
valve
Defective
control
← Check to be sure the stop
Stop valve
closed
valve is open.
← Conduct visual checks for
Bent or
crashed pipe
pipe conditions.
← Is there any temperature
Clogging of
foreign
difference caused before
materials
and after the filter or
branch pipe.
← Are the coil resistance and
Defective
valve coil
insulation normal?
Defective
valve body
← Are the electrical
Defective high
pressure characteristics normal?
sensor
← Is the pressure value
Defective
checked with the Service
service
Checker corresponding to
monitor PCB
the measurement value of
the pressure sensor?
Defective
← Are the coil resistance and
valve coil
insulation normal?
Defective
valve body
← Are the electrical
Defective high
pressure characteristics normal?
sensor
← Is the connector properly
Defective
indoor unit connected?
liquid pipe Are the thermistor
thermistor resistance characteristics
normal?
← Is the pressure value
Defective
checked with the Service
service
Checker corresponding to
monitor PCB
the measurement value of
the pressure sensor?