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Check
SiUS281811EA
292
Part 6 Service Diagnosis
5. Check
5.1 High
Pressure
Check
CHECK 1
Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points.
∗
1: In cooling, it is normal if the outdoor unit electronic expansion valve is fully open.
∗
2: In heating, the indoor unit electronic expansion valve is used for subcooling degree control.
Short circuit
Rise in high
pressure
Local
pressure
rise
High pipe
resistance
Stop valve closed
Bent or crushed pipe
Clogging of foreign
materials
[In cooling]
If the outdoor unit electronic
expansion valve is throttled:
(
*
1.)
Defective outdoor
unit electronic
expansion valve
Defective indoor
unit electronic
expansion valve
Defective valve coil
Defective valve body
A temperature difference in
excess of 10
°
C (18°F) between
the inlet and the outlet is
deemed to be abnormal.
Defective
control
Defective high pressure sensor
Defective main
PCB
Defective
high pressure
control
Defective valve coil
Defective valve body
[In heating]
If the indoor unit electronic
expansion valve excessively
throttled:
(
*
2.)
Defective
control
Defective high pressure sensor
Defective indoor unit
liquid pipe thermistor
Defective main
PCB
[In cooling]
High suction
air
temperature
of the
condenser
[In heating]
High suction air
temperature of
outdoor unit
Short circuit
High outdoor air
temperature
High suction
air temperature
of indoor unit
High room
temperature
Defective suction air thermistor of indoor unit
High suction air temperature of outdoor unit
Defective outdoor air temperature thermistor of outdoor unit
Degradation
in condensing
capacity
Dirty condenser
Mixing of non-condensable gas
Decreased
airflow rate
Decreased
fan
output
Defective fan
motor
Defective main
PCB (Including
capacity setting)
High
airflow
passage
resistance
Dirty filter
Obstacle
Excessive refrigerant charging
Improper model selection [In heating]
←
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?
←Is the pressure value checked with the Service Checker
corresponding to the measurement value of the pressure sensor?
←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?
←Is the connector properly connected?
Are the thermistor resistance characteristics normal?
←Are the voltage characteristics normal?
←Is the room temperature more than 27
°
C (80.6°F)?
←Is the connector properly connected?
Are the thermistor resistance characteristics normal?
←Is the outdoor air temperature more than 16
°
CWB
(60.8°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?
←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?
←Refer to
CHECK 6
.
←Is the indoor unit too small compared to
the large-sized outdoor unit?
←Is the suction air temperature more than 43
°
C
(109
°
F)?
←Is the outdoor air temperature more than 43
°
C
(109
°
F)?
←Is the suction air temperature more than 27
°
C
(80.6°F)?
Содержание SkyAir RZR-TA Series
Страница 1: ...Service Manual Cooling Only 60 Hz Heat Pump 60 Hz RZR TA RZQ TA Series SiUS281811EA...
Страница 202: ...SiUS281811EA 196 Part 6 Service Diagnosis 5 15 Fan Motor Connector Check for FTQ TA 311...
Страница 321: ...SiUS281811EA 315 Part 7 Appendix 1 Wiring Diagrams 316 1 1 Outdoor Unit 316 1 2 Indoor Unit 320 Part 7 Appendix...
Страница 322: ...Wiring Diagrams SiUS281811EA 316 Part 7 Appendix 1 Wiring Diagrams 1 1 Outdoor Unit RZR18 24TAVJU RZQ18 24TAVJU 3D115455...
Страница 323: ...SiUS281811EA Wiring Diagrams Part 7 Appendix 317 RZR18 24TAVJUA RZQ18 24TAVJUA 3D124495...
Страница 324: ...Wiring Diagrams SiUS281811EA 318 Part 7 Appendix RZR30 36 42 48TAVJU RZQ30 36 42 48TAVJU 3D115456...
Страница 325: ...SiUS281811EA Wiring Diagrams Part 7 Appendix 319 RZR30 36 42 48TAVJUA RZQ30 36 42 48TAVJUA 3D124500...
Страница 326: ...Wiring Diagrams SiUS281811EA 320 Part 7 Appendix 1 2 Indoor Unit FCQ18 24 30 36 42 48TAVJU 3D115647A...
Страница 327: ...SiUS281811EA Wiring Diagrams Part 7 Appendix 321 FHQ18 24 30PVJU FHQ36 42MVJU 3D048116C...
Страница 328: ...Wiring Diagrams SiUS281811EA 322 Part 7 Appendix FAQ18 24TAVJU 3D114844B...
Страница 329: ...SiUS281811EA Wiring Diagrams Part 7 Appendix 323 FBQ18 24 30 36 42 48PVJU 3D065984J...