Check - Daikin SkyAir RZR-P Series Service Manual

Troubleshooting by Remote Controller

2.50 Check

CHECK 1

Check for causes of rise in high pressure
Referring to the Fault Tree Analysis (FTA) shown below, probe the error points.
Local
pressure
rise
[In cooling]
If the outdoor unit electronic
expansion valve is throttled:
(See ∗1.)
Rise in high
pressure
Defective high
pressure
control
[In heating]
If the indoor unit electronic
expansion valve excessively
throttled:
(See ∗2.)
[In cooling]
High suction
air
temperature
of the
condenser
[In heating]
Degradation
in condensing
capacity
Excessive refrigerant charging
Improper model selection [In heating]
1: In cooling, it is normal if the outdoor unit electronic expansion valve (EV1) is fully open.
Note:
2: In heating, the indoor unit electronic expansion valve is used for "subcooling degree control".
Service Diagnosis
Stop valve closed
High pipe
Bent or crashed pipe
resistance
Clogging of foreign
particles
Defective outdoor
Defective valve coil
unit electronic
expansion valve
Defective valve body
A temperature di f ference i n excess of 50°F between
the i n l e t and the outl e t i s deemed to be abnormal .
Defective high pressure sensor
Defective
control
Defective service monitor PCB
Defective valve coil
Defective indoor
unit electronic
expansion valve
Defective valve body
Defective high pressure sensor
Defective Defective indoor unit
control liquid pipe thermistor
Defective service monitor PCB
Short circuit
High suction air
temperature of
outdoor unit
High outdoor air temperature
Short circuit
High suction
air temperature
of indoor unit
High outdoor air temperature
Defective suction air thermistor of indoor unit
High suction air temperature of outdoor unit
Defective outdoor air temperature thermistor of outdoor unit
Dirty condenser
Mixing of non-condensable gas
Decreased
fan
Decreased
output
fan airflow
rate
High air
passage
resistance
←Check to be sure the stop valve is open.
←Conduct visual checks for pipe conditions.
←Is there any temperature difference caused before
and after the filter or branch pipe.
←Are the coil resistance and insulation normal?
←Are the electrical characteristics normal?
←Is the pressure value checked with the Service Checker
corresponding to the measurement of the pressure sensor?
←Are the coil resistance and insulation
normal?
←Are the electrical characteristics normal?
←In 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
pressure sensor?
←Is the suction air temperature not more than 115°F?
←Is the outdoor air temperature not more than 115°F?
←Is the suction air temperature not more than 81°F?
←Is the indoor air temperature not more than 81°F?
←Is the connector properly connected?
Are the thermistor resistance characteristics normal?
←Is the outdoor air temperature not more than 61˚FWB?
←Is the connector properly connected?
Are the thermistor resistance characteristics normal?
←Is the heat exchanger clogged? (In cooling)
←Is air or else mixed in the refrigerant system?
Defective fan ←Can the fan motor be rotated with hands?
motor
Are the motor coil resistance and
insulation normal?
Defective service
monitor PCB
←If a spare PCB is mounted, is the capacity
(Including
setting properly made?
capacity setting)
←Is the air filter clogged?
Dirty filter
←Is there any obstacle in the air passage?
Obstacle
←Refer to troubleshooting "F6".
←Is the indoor unit too small compared to
the large-sized outdoor unit?
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