![background image](http://html2.mh-extra.com/html/daikin/skyair-fcq18pvju/skyair-fcq18pvju_service-manual_4705640024.webp)
Basic Control
SiUS28-902_a
17
Function
2. Basic Control
2.1
Normal Operation
Cooling Operation
Heating Operation
∗
Heating operation is not functional at an outdoor air temperature of 86
°
FDB 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)
1400 pls
⎯
Subcooling electronic expansion valve
(EV2)
PI control
⎯
Hot gas bypass valve (SVP)
OFF
This valve turns on with low pressure protection
control.
Receiver gas discharging valve (SVG)
OFF
—
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
STEP8
The fan step changes to STEP1 with high pressure
> 454 psi.
Four-way valve
ON
⎯
Main electronic expansion valve (EV1)
PI control
⎯
Subcooling electronic expansion valve
(EV2)
0 pls
⎯
Hot gas bypass valve (SVP)
OFF
This valve turns on with low pressure protection
control.
Receiver gas discharging valve (SVG)
OFF
—
Summary of Contents for SkyAir FCQ18PVJU
Page 1: ...Split System Air Conditioners SkyAir Inverter R 410A Heat Pump 60Hz P Series SiUS28 902_a...
Page 44: ...Other Control SiUS28 902_a 37 Function...
Page 81: ...SiUS28 902_a Troubleshooting by Remote Controller Troubleshooting 74...
Page 185: ...SiUS28 902 Precautions for New Refrigerant R 410A Precautions for New Refrigerant R 410A 178...