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SiUS28-902_a
Operation Mode
Function
16
1. Operation Mode
Operation in
stop mode
Pressure
equalization
prior to startup
Startup control
• Cooling startup
control
• Heating startup
control
Oil return IN
conditions are met.
Operation
mode change
Oil return operation
Pump-down
residual
operation
Restart standby
(Compressor stop)
Yes
Yes
No
No
Malfunction/Standby
Indoor unit stop or
thermostat OFF
Normal operation
• Compressor PI control
• Electronic expansion
valve PI control
• Protection control
Indoor unit thermostat ON
Defrost IN
conditions are met.
No
Yes
Defrosting operation
Cooling or heating
operation
Indoor unit thermostat ON
Indoor unit stop or
thermostat OFF
Indoor unit stop or
thermostat OFF
Malfunction/
Standby
Malfunction/
Standby
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.
Malfunction/Standby
Summary of Contents for SkyAir FCQ18PVJU
Page 1: ...Split System Air Conditioners SkyAir Inverter R 410A Heat Pump 60Hz P Series SiUS28 902_a...
Page 44: ...Other Control SiUS28 902_a 37 Function...
Page 81: ...SiUS28 902_a Troubleshooting by Remote Controller Troubleshooting 74...
Page 185: ...SiUS28 902 Precautions for New Refrigerant R 410A Precautions for New Refrigerant R 410A 178...