Si34-603 Basic ControlFunction 492. Basic Control2.1 Normal Operation Cooling Operation Heating Operation+Heating operation is not functional at an outdoor air temperature of 24°CDB or more.Actuator Operation RemarksCompressor Compressor PI controlUsed for high pressure protection control, lowpressure protection control, discharge pipetemperature protection control, and compressoroperating frequency upper limit control withinverter protection control.Outdoor unit fan Cooling fan control Four way valve OFF Main electronic expansion valve (EV1) 480 pls Subcooling electronic expansion valve(EV3) PI control Hot gas bypass valve (SVP) OFF This valve turns on with low pressure protectioncontrol.Actuator Operation RemarksCompressor Compressor PI controlUsed for high pressure protection control, lowpressure protection control, discharge pipetemperature protection control, and compressoroperating frequency upper limit control withinverter protection control.Outdoor unit fan STEP 7 or 8 Four way valve ON Main electronic expansion valve (EV1) PI control Subcooling electronic expansion valve(EV3) PI control Hot gas bypass valve (SVP) OFF This valve turns on with low pressure protectioncontrol.
