Detailed Control Functions; Stop Operation; Standby - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

Detailed Control Functions

2. Detailed Control Functions

2.1

Stop Operation

2.1.1 Stop due to Error
In order to protect compressors, if any of the abnormal state occurs, the system will make "stop with
thermostat OFF" and the error will be determined according to the number of retry times.
(Refer to "Error code and description" (P.100~) of the troubleshooting for the items to determine the error.)
2.1.2 When System is in Stop Mode
Both the master and slave units stop.
The four way valves both for heat exchanger switch and piping switch retain the condition before they were
stopped.
2.2

Standby

2.2.1 Restart Standby
Used to forcedly stop the compressor for a period of 5 minutes, in order to prevent the frequent ON/OFF of
the compressor and equalize the pressure within the refrigerant system.
In addition, the outdoor fan carry out the residual operation for a while to suppress the acceleration of the
pressure equalizing and melting of the refrigerant to the evaporator.
2.2.2 Crankcase Heater Control
In order to prevent the refrigerant from melting in the compressor oil in the stopped mode, this mode is used
to control the crankcase heater.
44
Crankcase heater
OFF
Discharge pipe
temperature < 70 ˚C
Discharge pipe
temperature > 75 ˚C
SiBE341027
Crankcase heater
ON
Function