Operation Mode
SiUS181305E
41
Function
1. Operation Mode
Startup control
Oil return operation
Yes
Yes
No
No
Malfunction/Standby
Normal operation
Indoor unit thermostat ON
No
Yes
Defrosting operation
Indoor unit thermostat ON
Note:
Malfunction/Standby
(R12924)
Indoor unit stop or
thermostat OFF
Operation in
stop mode
Pressure
equalization
prior to startup
Cooling or heating
operation
Oil return IN
conditions are met.
Defrost IN
conditions are met.
Operation
mode change
Malfunction/
Standby
Indoor unit stop or
thermostat OFF
Indoor unit stop or
thermostat OFF
Restart standby
(Compressor stop)
Malfunction/
Standby
Pump-down
residual
operation
If the 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.
• Compressor PI control
• Electronic expansion
valve PI control
• Protection control
• Cooling startup
control
• Heating startup
control
