SiUS331604E Operation Mode
Functions and Control 32
1. Operation Mode
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.
Startup control
•
•
Oil return operation
Yes
Yes
Yes
No
No
No
Error/Standby
Normal operation
• Compressor PI control
•
• Protection control
Indoor unit thermostat ON
Cooling or heating operation
Indoor unit thermostat ON
Error/Standby
Defrost operation
Defrost
starting
conditions are
met.
Indoor unit stop or
thermostat OFF
Pump down
residual
operation
Error/
Standby
Indoor unit stop or
thermostat OFF
Restart standby
(Compressor stop)
Operation in
stop mode
Pressure
equalization
prior to startup
Heating startup
control
Cooling startup
control
Oil return starting
conditions are met.
Operation
mode c
hange
Error/
Standby
Indoor unit stop or
thermostat OFF
Electronic expansion
valve PI control
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