Refrigerant Circuit
SiBE18-821_C
68
Refrigerant Circuit
1.2
BP Unit
No. in
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 non-operating 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
temperature)
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
temperature)
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 unit
SA indoor unit
EV
A
EV
H
(C)
(A) (B)
EV
B
EV
C
(Q0403)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
To
outdoor
unit
