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AHU-KIT
4.2.2 Brazing Work
(1) Prepare the inlet/outlet field piping just in front of the connection (do not braze yet).
A: Inlet coming from the outdoor unit
B: Outlet to air handling unit
C: Wire clamp
(2) Remove the wire clamp (C) by unscrewing 6×M4.2.
(3) Braze the field piping.
(1) Make sure there is nitrogen protection during welding.
Brazing without carrying out nitrogen replacement or releasing nitrogen into the piping will create large
quantities of oxidized film on the inside of the pipes, adversely affecting valves and compressors in the
refrigerating system and preventing normal operation.
(2) When brazing while inserting nitrogen into the piping, nitrogen must be set to 0.02MPa with a
pressure-reducing valve (=just enough so that it can be felt on the skin).
Fig.4.2.1
NOTICE
22
Unit: mm(inch)
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