Daikin ERQ - 4. Protection Control; 4.1 High Pressure Protection Control

ESIE09-05 Basic Control
Function 23
2. Basic Control
2.1 Normal Operation
 Cooling Operation
 Heating Operation
+Heating operation is not functional at an outdoor air temperature of 24° 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, and compressor
operating frequency upper limit control with
inverter 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 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 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 protection
control.
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