Operation Mode SiEBE18-526
54 Function
1. Operation Mode
Oil return operation
Ye s
Ye s
No
No
Malfunction/Standby
No
Yes
Defrosting operation
Indoor unit thermostat ON
Malfunction/Standby
(Q0372)
Indoor unit stop or
thermostat OFF
Operation in
stop mode
Pressure
equalization
prior to startup
Restart standby
(Compressor stop)
Indoor unit stop or
thermostat OFF
Indoor unit thermostat ON
without mode change
Pump-down
residual
operation
Indoor unit stop or
thermostat OFF
Malfunction/
Standby
Startup control
• Cooling startup
control
• Heating startup
control
Malfunction/
Standby
Normal operation
• Compressor PI control
• Electronic expansion
valve PI control
• Protection control
Cooling or heating
operation
BP unit
cooling: SH control
heating: SC control
Oil return IN
conditions are met.
Defrost IN
conditions are met.
Operation
mode c
hange
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.
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