Basic Control Si18-525B
108 Function
2. Basic Control
2.1 Normal Operation
Cooling Operation
Heating Operation
Heating 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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