Si34-601A
Troubleshooting (OP: Unified ON/OFF Controller)
Troubleshooting
313
[CHECK 4] Check for causes of drop in low pressure
Referring to the Fault Tree Analysis (FTA) shown below, probe the faulty points.
Abnormally low
low-pressure
(Low evaporating
temperature)
[In cooling]
(See *1.)
Faulty low
pressure
control
Faulty
compressor
capacity
control
Faulty low pressure sensor
←
Are the electrical characteristics normal?
Faulty control PCB
←
Is the pressure value checked with the Service Checker
corresponding to the measurement of the pressure sensor?
Faulty low
pressure
protection
control
Faulty low pressure sensor
←
Are the electrical characteristics normal?
Faulty hot gas solenoid valve
←
Are the coil resistance and insulation normal?
Faulty control PCB
←
Is the pressure value checked with the Service Checker
corresponding to the measurement of the pressure sensor?
[In both cooling
and heating]
(See *2.)
[In cooling]
If the indoor unit
electronic
expansion valve is
throttled too much:
(See *3.)
Faulty indoor
unit electronic
expansion valve
Faulty valve coil
Faulty valve body
←
Are the coil resistance and insulation normal?
Faulty
control
Faulty gas pipe
thermistor of indoor unit
Faulty liquid pipe thermistor
of indoor unit
Faulty control PCB
←
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 of the pressure sensor?
Faulty outdoor
unit electronic
expansion valve
Faulty valve coil
Faulty valve body
←
Are the coil resistance and insulation
normal?
[In heating]
If the outdoor unit
electronic
expansion valve
excessively
throttled:
(See *4.)
Faulty
control
Faulty low pressure sensor
Faulty suction pipe thermistor
Faulty control PCB
←
Are the electrical characteristics normal?
←
Check for the thermistor resistance and
connection.
[In cooling]
Low suction
air temperature
of the
evaporator
[In heating]
Low suction air
temperature of
indoor unit
Short circuit
←
Is the suction air temperature not less than 14˚C
←
Is the indoor temperature not more than 14˚C
Low ambient temperature
Faulty suction air thermistor of indoor unit
←
Is the connector properly connected?
Are the thermistor resistance characteristics normal?
Low suction air temperature of outdoor unit
←
Is the outdoor temperature not less than -20˚C
Faulty outdoor temperature thermistor of outdoor unit
←
Is the connector properly connected?
Are the thermistor resistance characteristics normal?
High pipe
resistance
Abnormal piping length
Bent or crashed pipe
Clogging of foreign particles
Stop valve closed
←
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?
←
Check to be sure the stop valve is open.
Less
circulation
quantity of
refrigerant
Degradation
in condensing
capacity
Inadequate refrigerant quantity
←
Refer to page 275.
Moisture choke
←
Eliminate moisture by vacuum operation.
Dirty
evaporator
Decreased
fan airflow
rate
Decreased
fan output
Faulty fan motor
←
Can the fan motor be rotated with hands?
Are the motor coil resistance and insulation normal?
←
Is the heat exchanger clogged?
Faulty control PCB
(Including capacity setting)
←
If a spare PCB is mounted, is the capacity
setting properly made?
High air
passage
resistance
Dirty filter
←
Is there any obstacle in the air passage?
←
Is the air filter clogged?
Obstacle
*1: For details of the compressor capacity control while in cooling, refer to “Compressor PI Control” on page 95.
*2: The “low pressure protection control” includes low pressure protection control and hot gas bypass control. For details, refer to page 119.
*3: In cooling, the indoor unit electronic expansion valve is used for “superheated degree control”. (For details, refer to page 135.)
*4: In heating, the outdoor unit electronic expansion valve (EV1) is used for “superheated degree control of outdoor unit heat exchanger”.
(For details, refer to page 107.)
Faulty electronic
expansion valve
control
SDK04009
Содержание VRV III RXYQ5-54PY1
Страница 1: ...RXYQ5 54PY1 R 410A Heat Pump 50Hz Si34 601A...
Страница 22: ...Si34 601A Specifications 11 Part 2 Specifications 1 Specifications 12 1 1 Outdoor Units 12 1 2 Indoor Units 33...
Страница 72: ...Si34 601A Refrigerant Circuit Refirgerant Circuit 61 RXYQ5P 3D050782 5 6 2 K T E D M N A P O W G J 4 3 1...
Страница 74: ...Si34 601A Refrigerant Circuit Refirgerant Circuit 63 RXYQ8P 3D050783 5 7 6 2 3 1 4 D N A P M O W T E F V G J...
Страница 101: ...Refrigerant Flow for Each Operation Mode Si34 601A 90 Refirgerant Circuit...
Страница 153: ...Outline of Control Indoor Unit Si34 601A 142 Function...
Страница 219: ...Troubleshooting by Remote Controller Si34 601A 208 Troubleshooting...
Страница 226: ...Si34 601A Troubleshooting by Remote Controller Troubleshooting 215...
Страница 325: ...Troubleshooting OP Unified ON OFF Controller Si34 601A 314 Troubleshooting...
Страница 327: ...Piping Diagrams Si34 601A 316 Appendix 1 Piping Diagrams 1 1 Outdoor Unit RXYQ5PY1 3D050782...
Страница 328: ...Si34 601A Piping Diagrams Appendix 317 RXYQ8P 3D050783...
Страница 329: ...Piping Diagrams Si34 601A 318 Appendix RXYQ10P 12PY1 3D050784...
Страница 330: ...Si34 601A Piping Diagrams Appendix 319 RXYQ14P 16P 18PY1 3D050785...
Страница 334: ...Si34 601A Piping Diagrams Appendix 323 FXUQ BEVQ Indoor unit Connection Unit 4D037995F 4D034127B...
Страница 335: ...Wiring Diagrams for Reference Si34 601A 324 Appendix 2 Wiring Diagrams for Reference 2 1 Outdoor Unit RXYQ5PY1 3D050453G...
Страница 336: ...Si34 601A Wiring Diagrams for Reference Appendix 325 RXYQ8PY1 3D050454J...
Страница 337: ...Wiring Diagrams for Reference Si34 601A 326 Appendix RXYQ10PY1 3D050455H...
Страница 338: ...Si34 601A Wiring Diagrams for Reference Appendix 327 RXYQ12PY1 3D051890G...
Страница 339: ...Wiring Diagrams for Reference Si34 601A 328 Appendix RXYQ14P 16P 18PY1 3D050456H...
Страница 340: ...Si34 601A Wiring Diagrams for Reference Appendix 329 2 2 Field Wiring RXYQ5P 8P 10P 12P 14P 16P 18PY1 3D051452D...
Страница 341: ...Wiring Diagrams for Reference Si34 601A 330 Appendix RXYQ20P 22P 24P 26P 28P 30P 32PY1 3D052261B...
Страница 342: ...Si34 601A Wiring Diagrams for Reference Appendix 331 RXYQ34P 36P 38P 40P 42P 44P 46P 48P 50P 52P 54PY1 C 3D052262B...
Страница 343: ...Wiring Diagrams for Reference Si34 601A 332 Appendix 2 3 Indoor Unit FXCQ20M 25M 32M 63MVE 3D039556A...
Страница 344: ...Si34 601A Wiring Diagrams for Reference Appendix 333 FXCQ40M 50M 80M 125MVE 3D039557A...
Страница 345: ...Wiring Diagrams for Reference Si34 601A 334 Appendix FXFQ25M 32M 40M 50M 63M 80M 100M 125MVE 3D039600A...
Страница 346: ...Si34 601A Wiring Diagrams for Reference Appendix 335 FXZQ20M 25M 32M 40M 50M7V1B 3D038359...
Страница 347: ...Wiring Diagrams for Reference Si34 601A 336 Appendix FXKQ25MA 32MA 40MA 63MAVE 3D039564C...
Страница 350: ...Si34 601A Wiring Diagrams for Reference Appendix 339 FXSQ20M 25M 32M 40M 50M 63M 80M 100M 125MVE 3D039561A...
Страница 351: ...Wiring Diagrams for Reference Si34 601A 340 Appendix FXMQ40MA 50MA 63MA 80MA 100MA 125MAVE 3D039620B...
Страница 352: ...Si34 601A Wiring Diagrams for Reference Appendix 341 FXMQ200MA 250MAVE 3D039621B...
Страница 353: ...Wiring Diagrams for Reference Si34 601A 342 Appendix FXHQ32MA 63MA 100MAVE 3D039801D...
Страница 354: ...Si34 601A Wiring Diagrams for Reference Appendix 343 FXAQ20MA 25MA 32MAVE 40MA 50MA 63MAVE 3D034206C...
Страница 356: ...Si34 601A Wiring Diagrams for Reference Appendix 345 FXUQ71MA 100MA 125MAV1 3D044973A...
Страница 357: ...Wiring Diagrams for Reference Si34 601A 346 Appendix FXMQ125MF 200MF 250MFV1 3D044996C...
Страница 358: ...Si34 601A Wiring Diagrams for Reference Appendix 347 BEVQ71MA 100MA 125MAVE 3D044901B...
Страница 381: ...Method of Checking The Inverter s Power Transistors and Diode Modules Si34 601A 370 Appendix...
Страница 395: ...Si34 601A iv Index...