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Abnormally dropin
low pressure
(Low evaporating
temperature)
[In cooling]
(
!
1.)
Defective
low pressure
control
Defective
compressor
capacity
control
Defective low pressure
sensor
Defective main PCB
Defective
low pressure
protection
control
Defective low pressure
sensor
Defective hot gas
solenoid valve
Defective main PCB
[In both cooling
and heating]
(
!
2.)
[In cooling]
If the indoor unit
electronic
expansion valve is
throttled too much:
(
!
3.)
Defective indoor
unit electronic
expansion valve
Defective valve coil
Defective valve body
Defective
control
Defective gas pipe
thermistor of indoor unit
Defective liquid pipe
thermistor of indoor unit
Defective main PCB
Defective outdoor
unit electronic
expansion valve
Defective valve coil
Defective valve body
[In heating]
If the outdoor unit
electronic
expansion valve
excessively
throttled:
(
!
4.)
Defective
control
Defective low pressure
sensor
Defective suction pipe
thermistor
Defective main PCB
[In cooling]
Low suction air
temperature of
the evaporator
[In heating]
Low suction air
temperature of
indoor unit
Short circuit
Low room temperature
Defective suction air thermistor of indoor unit
Low suction air temperature of outdoor unit
Defective outdoor air temperature thermistor of outdoor unit
High pipe
resistance
Abnormal piping length
Bent or crashed pipe
Clogging of foreign materials
Stop valve closed
Less
circulation
quantity of
refrigerant
Degradation
in evaporating
capacity
Refrigerant shortage
Moisture choke
Dirty
evaporator
Decreased
airflow rate
Decreased
fan output
Defective fan motor
←Can the fan motor be rotated with hands?
Are the motor coil resistance and insulation normal?
←If a spare PCB is installed, is the
capacity setting properly made?
←Is the air filter clogged?
←Is there any obstacle in the airflow passage?
Defective main PCB
(Including capacity setting)
High
airflow
passage
resistance
Dirty filter
Obstacle
Defective electronic
expansion valve
control
←Is the pressure value checked with the Service Checker
corresponding to the measurement value of the pressure sensor?
←Are the voltage characteristics normal?
←Is the pressure value checked with the Service Checker
corresponding to the measurement value of the pressure sensor?
←Are the coil resistance and insulation normal?
←Are the voltage characteristics normal?
←Are the coil resistance and insulation normal?
←Check for the thermistor resistance and connection.
←Check for the thermistor resistance and connection.
←Are the voltage characteristics normal?
←Are the coil resistance and insulation normal?
←Is the pressure value checked with the Service Checker
corresponding to the measurement value of the pressure sensor?
←Check for the thermistor resistance and connection.
←Is the suction air temperature less than 14°C (57.2°F)?
←Is the room temperature less than 14°C (57.2°F)?
←Is the connector properly connected?
Are the thermistor resistance characteristics normal?
←Is the outdoor air temperature less than –20°C (–4°F)?
←Is the connector properly connected?
Are the thermistor resistance characteristics normal?
←Does the piping length fall in the permissible range?
←Conduct visual checks for pipe conditions.
←Is there any temperature difference caused before and
after the filter or branch pipe?
←Refer to the
CHECK 7
.
←Eliminate moisture by vacuum operation. (Refer to
CHECK 8
)
←Is the heat exchanger clogged?
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Содержание SkyAir RZQ-TA Series
Страница 1: ...Service Manual Cooling Only 60 Hz Heat Pump 60 Hz RZR TA RZQ TA Series SiUS281811E...
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Страница 288: ...LULQJ LDJUDPV 6L86 3DUW SSHQGL 4 7 9 8 3D114844B...
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