Basic Control; Normal Operation - Daikin D-Series Service Manual

Basic Control

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
(EV2)
Hot gas bypass valve (SVP)
Receiver gas discharging valve (SVG)
BP unit electronic expansion valve
(operating room)
BP unit electronic expansion valve
(stopping room)
Heating Operation
Actuator
Compressor
Outdoor unit fan
Four way valve
Main electronic expansion valve (EV1)
Subcooling electronic expansion valve
(EV2)
Hot gas bypass valve (SVP)
Receiver gas discharging valve (SVG)
BP unit electronic expansion valve
(operating room)
BP unit electronic expansion valve
(stopping room)
Heating operation is not functional at an outdoor air temperature of 30 ° CDB or more.
108
Operation
Compressor PI control
Cooling fan control
OFF
2000 pls
PI control
OFF
OFF
SH control
0 pls
Operation
Compressor PI control
STEP8
ON
PI control
0 pls
OFF
OFF
SC control
80 pls
Remarks
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.




This valve turns on with low pressure protection
control.
This valve turns on with dew prevention 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.
The fan step changes to STEP1 with high pressure
> 3.2MPa.


The opening of this valve changes with high
pressure > 3.2MPa.
This valve turns on with low pressure protection
control.
—

The opening of this valve changes with insufficient
gas control.
Si18-525B
Function