To Braze The Pipe End - Daikin EHFZ03S18DJ3V Installer's Reference Manual

8 | Piping installation

8.2.6 To braze the pipe end

Installer reference guide
68
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.
b
Conventional flare tool
Clutch type
(Ridgid-type)
1.0~1.5 mm
b
c
c d e
f
Wing nut type
(Imperial-type)
1.5~2.0 mm
ERLA03DAV3 + EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596821-1B – 2021.10