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Special Control
SiUS28-902_a
21
Function
3. Special Control
3.1
Startup Control
On activation, the following control is performed to lighten the load of the compressor with liquid
refrigerant located at the compressor at startup. Also, the position of the four-way valve is
defined.
3.1.1 Startup Control in Cooling Operation
3.1.2 Startup Control in Heating Operation
Actuator
Operation
Remarks
Compressor
Differential pressure control
Compressor operating frequency
increases by 2 step / 20 sec. until
Pc - Pe>58 psi.
Outdoor unit fan
High pressure control
Initial fan speed is set to STEP 0.
1-step increase with Pc>305 psi
1-step decrease with Pc<261 psi
Four-way valve
OFF
⎯
Main electronic expansion valve (EV1)
1400 pls
⎯
Subcooling electronic expansion valve
(EV2)
0 pls
⎯
Hot gas bypass valve (SVP)
ON
⎯
Receiver gas discharging valve (SVG)
OFF
⎯
Ending conditions
•
230 sec.
•
Pc - Pe>58 psi
•
45 sec.
Actuator
Operation
Remarks
Compressor
Differential pressure control
Compressor operating frequency
increases by 2 step / 20 sec. until
Pc - Pe>58 psi
Outdoor unit fan
STEP 8
⎯
Four-way valve
ON
⎯
Main electronic expansion valve (EV1)
180 pls
⎯
Subcooling electronic expansion valve
(EV2)
0 pls
⎯
Hot gas bypass valve (SVP)
ON
⎯
Receiver gas discharging valve (SVG)
OFF
⎯
Ending conditions
•
145 sec.
•
Pc - Pe>58 psi
•
15 sec.
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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...