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Refrigerant Circuit
SiEN18-622
86
Refrigerant Circuit
1.2
BP Units
No. in
refrigerant
system
diagram
Symbol
Name
Major Function
A
EVU
Electronic expansion valve
(for operating room)
Among EVA, EVB and EVC, the electronic expansion valve of operating room is called
EVU.
B
EVT
Electronic expansion valve
(for stopping room)
Among EVA, EVB and EVC, the electronic expansion valve of stopping room is called
EVT.
C
EVH
Electronic expansion valve
(Bypass)
While in oil return operation, used to adjust the refrigerant circulating rate of indoor
unit.
1
DGA
~ DGC
Thermistor (Gas pipe)
While in cooling operation, used to carry out the indoor unit SH control and cooling gas
pipe isothermal control.
2
DLA
~ DLC
Thermistor (Liquid pipe)
While in heating operation, used to carry out the indoor unit SC control.
3
R1T
Thermistor (Room temp.)
Used to detect room air temperature and instructs the capacity supply to BP unit.
4
R2T
Thermistor (Heat exchanger)
Used to detect heat exchanger temperature and carry out various protection functions
and controls of capacity.
5
R1T
Thermistor (Room temp.)
Used to detect room air temperature and instructs the capacity supply to BP unit.
6
R2T
Thermistor
(Heat exchanger 1)
Used to detect heat exchanger temperature and carry out various protection functions
and controls of capacity.
7
R3T
Thermistor
(Heat exchanger 2)
Used to detect heat exchanger temperature and carry out various protection functions
and controls of capacity.
Filter
Filter
Filter
Filter
Filter
RA indoor
u
nit
S
A indoor
u
nit
EV
A
EV
H
C
A B
EV
B
EV
C
(Q040
3
)
1
2
3
4
5
6
7
To
o
u
tdoor
u
nit
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 ...