SiEBE18-526 Basic Control
Function 55
2. Basic Control
2.1 Normal Operation
Cooling Operation
Heating Operation
HHeating operation is not functional at an outdoor air temperature of 30°CDB or more.
Actuator Operation Remarks
Compressor Compressor PI control
Used for high pressure protection control, low
pressure protection control, discharge pipe
temperature protection control, compressor
operating frequency upper limit control with
inverter protection control, dew prevention control,
and freeze-up protection control.
Outdoor unit fan Cooling fan control ⎯
Four way valve OFF ⎯
Main electronic expansion valve (EV1) 2000 pls ⎯
Subcooling electronic expansion valve
(EV2)
PI control ⎯
Hot gas bypass valve (SVP) OFF
This valve turns on with low pressure protection
control.
Receiver gas discharging valve (SVG) OFF This valve turns on with dew prevention control.
BP unit electronic expansion valve
(operating room)
SH control
⎯
BP unit electronic expansion valve
(stopping room)
0 pls ⎯
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 unit fan STEP8
The fan step changes to STEP1 with high pressure
> 3.2MPa.
Four way valve ON ⎯
Main electronic expansion valve (EV1) PI control ⎯
Subcooling electronic expansion valve
(EV2)
0 pls
The opening of this valve changes with high
pressure > 3.2MPa.
Hot gas bypass valve (SVP) OFF
This valve turns on with low pressure protection
control.
Receiver gas discharging valve (SVG) OFF —
BP unit electronic expansion valve
(operating room)
SC control
⎯
BP unit electronic expansion valve
(stopping room)
80 pls
The opening of this valve changes with insufficient
gas control.
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