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Daikin VRV III-S RXYMQ36 48PVJU Service Manual: Operation Mode

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SiUS34-907

1. Operation Mode

Indoor unit stop or
thermostat OFF
Normal operation
• Compressor PI control
• Electronic expansion
valve PI control
• Protection control
Function
Operation in
stop mode
Indoor unit thermostat ON
Pressure
equalization
prior to startup
Startup control
• Cooling startup
control
• Heating startup
control
Cooling or heating
operation
Yes
Oil return IN
conditions are met.
No
Yes
Defrost IN
conditions are met.
No
Yes
Operation
mode change
No
Malfunction/Standby
Indoor unit stop or
thermostat OFF
Indoor unit thermostat ON
Malfunction/Standby
Indoor unit stop or
thermostat OFF
Malfunction/
Standby
Note:
In the event indoor unit stops or the thermostat
turns OFF while in oil return operation or
defrosting operation, pump down residual
operation is performed on completion of the oil
return operation or defrosting operation.
Restart standby
(Compressor stop)
Pump down
residual
operation
Oil return operation
Defrosting operation
Operation Mode
Malfunction/
Standby
31

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    RXYQ18PAY6 service manual & vrv Fulform