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High Temperature Hydro Module
202003
17
Engineer
ing Da
ta
1
Compressor
10
Water inlet temperature sensor
2
Plate heat exchanger used by the condenser
11
Water outlet temperature sensor
3
Electronic expansion valve on the R134a loop
12
Water flow switch
4
Plate heat exchanger used by the evaporator
13
High pressure sensor
5
Electronic expansion valve on the R410A loop
14
Low pressure sensor
6
Discharge temperature sensor
15
High pressure switch
7
Suction temperature sensor
16
Filter
8
Cold outlet temperature sensor on the R134a refrigerant
side
17
Access hole
9
Liquid pipe temperature sensor at the outlet on the R410A
refrigerant side
Connecting pipes on the refrigerant side and water system side
Use screw thread to connect the pipe on the water system side. Tighten the pipe to avoid water leakage.
Brazing is required on the refrigerant side.
1
15
13
6
2
10
3
4
14
7
16
5
11
9
8
17
F
12
16
R410a flow route
R134a flow route
Wafer flow
Brazing Precautions
In the event of brazing, please use nitrogen for sweeping. This can prevent the occurrence of oxidation
inside pipes. Oxidation will have adverse effects on the valves and compressors in the cooling system,
and may hamper normal operations.
Use the pressure relief valve to set the nitrogen pressure to 0.02 MPa (a pressure that can just be felt by
the skin).
Do not use antioxidants when brazing pipe connectors. Residues will block pipes and damage equipment.
Do not use a flux when brazing copper refrigerant pipes. Use copper-phosphorus alloys (BCuP) where no
flux is required.
Flux is harmful to the cooling pipe system. For example, if a chlorine-based flux is used, pipes will be
corroded. Especially when the flux contains fluorine, the flux will degrade the frozen oil.
Notes for installers and service engineers