Operation Mode - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

SiUS331604E

1. Operation Mode

Indoor unit stop or
thermostat OFF
Normal operation
• Compressor PI control
Electronic expansion
•
valve PI control
• Protection control
Note:
In the event that the indoor unit stops or the thermostat turns OFF while in oil return operation or defrost
operation, pump down residual operation is performed on completion of oil return operation or defrost operation.
Functions and Control
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 starting
conditions are met.
No
Yes
Defrost starting
conditions are
met.
No
Yes
Operation
mode change
No
Error/Standby
Indoor unit stop or
thermostat OFF
Indoor unit thermostat ON
Error/Standby
Indoor unit stop or
thermostat OFF
Error/
Standby
Restart standby
(Compressor stop)
Pump down
residual
operation
Oil return operation
Defrost operation

Operation Mode

Error/
Standby
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