Daikin VRV IV Q+ Series, Инструкция по установке и эксплуатации

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19 Troubleshooting
Installation and operation manual
39
RXYQQ8~20U7Y1B
VRV IV Q+ series heat pump
4P546221-1B – 2020.10
Main code Sub code Cause Solution
Master Slave 1 Slave 2
High pressure switch was activated
(S1PH, S2PH, S3PH, S4PH) - A1P
(X2A , X3A, X4A) Check stop valve situation or
abnormalities in (field) piping or airflow
over air cooled coil.
▪ Refrigerant overcharge
▪ Stop valve closed
▪ Check refrigerant recharge
unit.
▪ Open stop valves
Stop valve closed (liquid) Open liquid stop valve.
▪ Refrigerant overcharge
▪ Stop valve closed
▪ Check refrigerant recharge
unit.
▪ Open stop valves.
Low pressure malfunction:
▪ Stop valve closed
▪ Refrigerant shortage
▪ Indoor unit malfunction
▪ Open stop valves.
▪ Check refrigerant recharge
unit.
▪ Check the user interface's display or
transmission wiring between the
outdoor unit and the indoor unit.
Electronic expansion valve malfunction
(main) (Y1E) - A1P (X21A) Check connection on PCB or actuator.
Electronic expansion valve malfunction
(liquid cooling) (Y3E) - A1P (X23A) Check connection on PCB or actuator.
Electronic expansion valve malfunction
(subcool) (Y2E) - A1P (X22A) Check connection on PCB or actuator
Electronic expansion valve malfunction
(storage vessel) (Y4E) - A1P (X25A) Check connection on PCB or actuator
Discharge temperature too high
(R21T/R22T):
▪ Stop valve closed
▪ Refrigerant shortage
▪ Open stop valves.
▪ Check refrigerant recharge
unit.
Compressor casing temperature too
high (R8T/R9T):
▪ Stop valve closed
▪ Refrigerant shortage
▪ Open stop valves.
▪ Check refrigerant recharge
unit.
▪ Refrigerant overcharge
▪ Stop valve closed
▪ Check refrigerant recharge
unit.
▪ Open stop valves.
Ambient temperature sensor
malfunction (R1T) - A1P (X18A) Check connection on PCB or actuator.