Basic Control; Normal Operation - Daikin ERSQ 011AAV1 Service Manual

ESIE09-08

2. Basic Control

2.1

Normal Operation

Heating Operation Outdoor Unit
Actuator
Compressor
Outdoor unit fan
Four way valve
Main electronic expansion valve (EV1)
Subcooling electronic expansion valve
(EV3)
Hot gas bypass valve (SVP)
Heating operation is not functional at an outdoor air temperature of field setting [9-02]. Default [20°C - 24°C].
Heating Operation Indoor Unit
Actuator
Compressor
Four way valve (Y1R)
Two way valve (K2S) = solenoid valve
Electronic expansion valve (K1E)
Electronic expansion valve (K2E)
DC inverter pump
Function
Operation
Compressor PI control
STEP 7 or 8
ON
PI control
PI control
OFF
Operation
Compressor PI control
OFF
CLOSED
PI control
PI control
PI control
Remarks
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.
All steps possible, mainly STEP 7 OR 8
⎯
⎯
⎯
This valve turns on with low pressure protection
control.
Remarks
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.
Only activated during defrost.
Only open during defrost.
⎯
⎯
⎯

Basic Control

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