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BP Unit Control
SiEN18-622
116
Function
6.2.3 Full Closing of Electronic Expansion Valves
Purpose of the
Function
The electronic expansion valves are initialized when the power is turned on.
Details
The following processes are conducted.
1. Conducts P1 pulses close when power is turned on, and sets current opening to 0 pulse
(fully closing process).
2. Sends electronic expansion valve initialization signal to outdoor unit.
3. Closes the electronic expansion valve of each chamber (sets the electronic expansion valve
pulse to 0).
4. Stops transmission of electronic expansion valve initialization signal when EVH retightening
is completed.
6.2.4 Control Based on EV Opening Command from Outdoor Unit
Purpose of the
Function
This function operates the electronic expansion valve based on EV opening command sent from
the outdoor unit.
Outline
The electronic expansion valve operation based on EV opening command provides the
following functions.
1) Pressure equalization prior to startup
2) Startup control
3) Restart standby
4) Pump-down residual operation
5) Oil return operation
6) Defrost operation
Power ON
P 1
P 1
0
0
P 1
0
P 1
0
EVA
EVB
EVC
EVH
(M1047)
Summary of Contents for FTKS50BVMB
Page 1: ...SiEN18 622 E Series Service Manual Applied Models zSuper Multi Plus Cooling Only Heat Pump ...
Page 105: ...Refrigerant Flow for Each Operation Mode SiEN18 622 92 Refrigerant Circuit ...
Page 157: ...Indoor Unit SkyAir Models SiEN18 622 144 Function ...
Page 312: ...SiEN18 622 Ceiling Mounted Cassette Type System Configuration 300 ...
Page 424: ...Method of Replacing The Inverter s Power Transistors Modules SiEN18 622 412 Troubleshooting ...
Page 446: ...Wiring Diagrams SiEN18 622 434 Appendix ...
Page 452: ...SiEN18 622 vi Index ...