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8.2.6 To braze the pipe end
ERLA03D + EHFH03S18D
Daikin Altherma 3 R F
4P596806-1C – 2022.09
a
a Cut exactly at right angles.
b Remove burrs.
3 Remove the flare nut from the stop valve and put the flare nut on the pipe.
4 Flare the pipe. Set exactly at the position as shown in the following figure.
A
Flare tool for R32
(clutch type)
A
0~0.5 mm
5 Check that the flaring is properly made.
a
a Flare's inner surface MUST be flawless.
b The pipe end MUST be evenly flared in a perfect circle.
c Make sure the flare nut is fitted.
The indoor unit and outdoor unit have flare connections. Connect both ends
without brazing. If brazing should be needed, take the following into account:
▪
When brazing, blow through with nitrogen to prevent creation of large quantities
of oxidised film on the inside of the piping. This film adversely affects valves and
compressors in the refrigerating system and prevents proper operation.
▪
Set the nitrogen pressure to 20 kPa (0.2 bar) (just enough so it can be felt on the
skin) with a pressure-reducing valve.
a
b
f
a Refrigerant piping
b Part to be brazed
c Taping
d Manual valve
e Pressure-reducing valve
f Nitrogen
▪
Do NOT use anti-oxidants when brazing 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 harmful influence on refrigerant piping systems. For
instance, if chlorine based flux is used, it will cause pipe corrosion or, in
particular, if the flux contains fluorine, it will deteriorate the refrigerant oil.
b
Conventional flare tool
Clutch type
(Ridgid-type)
1.0~1.5 mm
b
c
c
d
e
f
8
Piping installation
|
Wing nut type
(Imperial-type)
1.5~2.0 mm
Installer reference guide
75
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