Daikin FTKS50BVMB, Service Manual

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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