Expansion Valve Control; The Eev Controls The Flow Of Refrigerant - Fujitsu Airstage VR-II Series Service Manual

2-7 EXPANSION VALVE CONTROL

The EEV controls the flow of refrigerant

Operation mode
Cooling
EEV 1 Cooling Main
EEV 2
Heating
Heating Main
Cooling
Cooling Main
EEV 3
Heating
Heating Main
Initialization conditions:
- When power turned On. - When operation stopped.
4WV 1
4WV 2
Contrl and detection
- Liquid Pressue control (TH4)
- HEX balance (TH9,TH10)
"TH9 TH10"
- SH control (TH7,TH8 - LPS )
"Target SH: 8 F (4 C)
- Protection (TH1) (LPS)
- SH control (TH6 - LPS )
"Target SH: 8 F (4 C)
- Protection (TH1)
TH7
TH9
HEX1
EEV1
TH8
TH10
HEX2
EEV2
FP
FAN1
TH2
Control range
operation range
52- 480 pulses
"
11 - 480 pulses
"
0- 500 pulses
SV4
EEV3
RCV
TH4
SCHEX
TH5
TH6
02-10
stop
0 pulses
0 pulses
0 pulses