Service manual

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