Operation Mode - Daikin FCQ18PVJU Service Manual

SiUS28-902_a

1. Operation Mode

Indoor unit stop or
thermostat OFF
Startup control
• Cooling startup
control
• Heating startup
control
Normal operation
• Compressor PI control
• Electronic expansion
valve PI control
• Protection control
Oil return IN
conditions are met.
Defrost IN
conditions are met.
Function
Operation in
stop mode
Indoor unit thermostat ON
Pressure
equalization
prior to startup
Indoor unit thermostat ON
Malfunction/Standby
Cooling or heating
operation
Yes
No
Yes
No
Yes
Operation
mode change
No
Malfunction/Standby
Indoor unit stop or
thermostat OFF
Indoor unit stop or
thermostat OFF
Malfunction/
Standby
Oil return operation
Defrosting operation
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.
Operation Mode
Restart standby
(Compressor stop)
Malfunction/
Standby
Pump-down
residual
operation
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