MIV V5 Heat Recovery DC Inverter R410A
DM14-01.01.18en
117
Installation
Procedure
7. Caution for brazing
Make sure to blow through with nitrogen when brazing. Blowing through with nitrogen prevents the creation
of large quantities of oxidized film on the side of the pipe. An oxidized film adversely affects valves and
compressors in the refrigerating system and prevents proper operation.
The nitrogen pressure should be set to 0.02MPa (just enough so it can be felt on the skin) with a
pressure-reducing valve.
Do not use anti-oxidants when brazing the pipe joints. Residue can clog pipes and break equipment.
Do not use flux when brazing copper-to-copper refrigerant piping. Use phosphor copper brazing filler alloy
(BCuP) which does not require flux.
Flux has an extremely harmfully influence on refrigerant pipe systems. For instance, if chlorine based flux is
used, it will cause pipe corrosion in particular, if the flux contains fluorine, it will deteriorate the refrigerant oil.
1
2
3
4
5
6
6
1 Refrigerant pipe
2 Part to be brazed
3 Taping
4 Hands valve
5 Pressure-reducing valve
6 Nitrogen
