Basic Control SiBE18-821_C
78 Function
2. Basic Control
2.1 Normal Operation
[Cooling Operation]
[Heating Operation]
★
Heating operation does not function when the outdoor temperature is above 24
°
CDB.
Actuator Operation Remarks
Compressor Compressor PI control
Used for high pressure protection control, low
pressure protection control, discharge pipe
temperature protection control, and compressor
operating frequency upper limit control with
inverter protection control.
Outdoor fan Cooling fan control
Four way valve (Y1S) OFF
Main electronic expansion valve (Y1E) 480 pls
Subcooling electronic expansion valve
(Y3E)
PI control
Hot gas bypass valve (Y2S) OFF
This valve turns on with low pressure protection
control.
Actuator Operation Remarks
Compressor Compressor PI control
Used for high pressure protection control, low
pressure protection control, discharge pipe
temperature protection control, and compressor
operating frequency upper limit control with
inverter protection control.
Outdoor fan STEP 7 or 8
Four way valve (Y1S) ON
Main electronic expansion valve (Y1E) PI control
Subcooling electronic expansion valve
(Y3E)
PI control
Hot gas bypass valve (Y2S) OFF
This valve turns on with low pressure protection
control.
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