Midea ATOM MDV-V28WDHN1 Manual page 85

Atom B Series VRF 50/60Hz
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Piping orientation during brazing
Brazing should be conducted downwards or horizontally to avoid filler leakage.
Figure 3-4.6: Piping orientation during brazing
Piping overlap during brazing
Table 3-4.3 specifies the minimum permissible piping overlap and the range of permissible gap sizes for brazed joints
on piping of different diameters. Refer also to Figure 3-4.7.
Figure 3-4.7: Piping overlap and gap for brazed joints
Filler
 Use a copper/phosphorus brazing alloy (BCuP) filler that does not require flux.
 Do not use flux. Flux can cause corrosion of piping and can affect the performance of compressor oil.
 Do not use anti-oxidants when brazing. Residue can clog piping and damage components.
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Table 3-4.3: Piping overlap and gap for brazed joints
Minimum
D (mm) permissible B
(mm)
5 < D < 8 6
8 < D < 12 7
12 < D < 16 8
16 < D < 25 10
25 < D < 35 12
35 < D < 45 14
Notes:
1. A, B, D refer to the dimensions shown in Figure 3-4.7.
Legend
A Inner diameter of larger pipe
D Outer diameter of smaller pipe
B Inlaid depth (overlap)
1
Permissible A – D
(mm)
0.05 - 0.21
0.05 - 0.27
0.05 - 0.35