Service Manual
Table Of Contents
- Cover
- Table of contents
- Part 1 List of Functions
- Part 2 Specifications
- Part 3 Printed Circuit Board Connector Wiring Diagram
- Part 4 Refrigerant Circuit
- Part 5 Functions and Control
- Part 6 Test Operation and Field Settings
- Part 7 Remote Controller
- Part 8 Troubleshooting
- 1. Troubleshooting with LED
- 2. Service Diagnosis
- 3. Error Codes and Description
- 4. Troubleshooting for CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series
- 5. Troubleshooting for FFQ Series
- 6. Troubleshooting for Branch Provider (BP) Unit
- 7. Troubleshooting for Outdoor Unit
- 8. Thermistor Resistance/Temperature Characteristics
- 9. Pressure Sensor
- 10. Method of Replacing Inverter’s Power Transistors Modules
- Part 9 Appendix
SiUS181631EA Refrigerant Circuit
Refrigerant Circuit 43
1.2 Branch Provider (BP) Unit
No. in
diagram
Symbol Name Major Function
AEVU
Electronic expansion valve
(for operating room)
Among EVA, EVB and EVC, the electronic expansion valve of operating room is called
EVU.
BEVT
Electronic expansion valve
(for non-operating room)
Among EVA, EVB and EVC, the electronic expansion valve of stopping room is called
EVT.
CEVH
Electronic expansion valve
(Bypass)
During oil return operation, used to adjust the refrigerant circulating rate of the indoor unit.
1
DGA
~ DGC
Thermistor (Gas pipe)
During cooling operation, used to carry out the indoor unit SH control and cooling gas pipe
isothermal control.
2
DLA
~ DLC
Thermistor (Liquid pipe) During heating operation, used to carry out the indoor unit SC control.
3R1T
Thermistor
(Room temperature)
Used to detect room air temperature and instruct the capacity supply to the BP unit.
4R2T
Thermistor
(Indoor heat exchanger)
Used to detect heat exchanger temperature and carry out various protection functions and
controls of capacity.
5R1T
Thermistor
(Room temperature)
Used to detect room air temperature and instruct the capacity supply to the BP unit.
6R2T
Thermistor
(Indoor heat exchanger 1:
liquid pipe)
Used to detect heat exchanger temperature and carry out various protection functions and
controls of capacity.
7R3T
Thermistor
(Indoor 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
EVA
EVH (C)
(A) (B)
EVB
EVC
(Q0403)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
To
outdoor
unit