To Braze The Pipe End - Daikin VRV 5 S Series Installer And User Manual

18.2.5 To braze the pipe end

RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1D – 2023.02
WARNING
NEVER remove the spun piping by brazing.
Any gas or oil remaining inside the stop valve may blow off the spun piping.
6 Wait until all oil has dripped out before continuing with the connection of the
field piping in case the recovery was not complete.
NOTICE
Precautions when connecting field piping. Add brazing material as shown in the
figure.
≤Ø25.4
1
1
▪ 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.
18
c d e
f
Piping installation
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Installer and user reference guide
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