Basic Control; Normal Operation - Daikin VRVIII-S Service Manual

SiENBE34-703

2. Basic Control

2.1

Normal Operation

! Cooling Operation
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
Actuator
Compressor
Outdoor unit fan
Four way valve
Main electronic expansion valve (EV1)
Subcooling electronic expansion valve
(EV3)
Hot gas bypass valve (SVP)
HHeating operation is not functional at an outdoor air temperature of 24°CDB or more.
Function
Operation
Compressor PI control
Cooling fan control
OFF
480 pls
PI control
OFF
Operation
Compressor PI control
STEP 7 or 8
ON
PI control
PI control
OFF
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.
⎯
⎯
⎯
⎯
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.
⎯
⎯
⎯
⎯
This valve turns on with low pressure protection
control.

Basic Control

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