3.1.5 Suspension of refrigerant piping
Suspend the refrigerant piping at certain points and prevent the refrigerant piping from touching the weak part of the
building such as wall, ceiling, etc…
(If touched, abnormal sound may occur due to the vibration of the piping. Pay special attention in case of short piping
length).
1~15m
Fire-proof section
treatment
Indoor unit
Do not fix the refrigerant piping directly with the metal fittings (The refrigerant piping may expand and contract).
Some examples for suspension method are shown below.
For Suspending
Heavies
For piping
along the wall
For instant
installation work
3.1.6 Brazing work
The most important work in the refrigerant piping installation work is the brazing of the pipes. If it accidentally occurs a
leakage due to a careless brazing process, it will cause clogged capillary pipes or serious compressor failure.
It is important to control the clearance of the pipe fitting portion as shown below. In the case that a cooper tube expansion
jig is used, following dimensions should be secured.
In order to guarantee a proper brazing neck between different pipes surfaces, accurate pipe dimensions after the
expansion process (see the following table):
Copper pipe size
Ød1
Gap
a
Copper pipe size
Ød1
Gap
a
Ø6.35
+0.08
Ø6.5
+0.1
0.33
6
Ø22.22
+0.09
Ø22.42
+0.1
0.39
10
-0.08
0
0.07
-0.09
0
0.11
Ø9.52
+0.08
Ø9.7
+0.1
0.35
8
Ø25.4
+0.12
Ø25.6
+0.1
0.42
12
-0.08
0
0.09
-0.12
0
0.08
Ø12.7
+0.08
Ø12.9
+0.1
0.38
8
Ø28.58
+0.12
Ø28.78
+0.1
0.42
12
-0.08
0
0.19
-0.12
0
0.08
Ø15.88
+0.09
Ø16.1
+0.1
0.41
8
Ø31.75
+0.12
Ø32.0
+0.1
0.47
12
-0.09
0
0.13
-0.12
0
0.13
Ø19.05
+0.09
Ø19.3
+0.1
0.44
10
Ø38.1
+0.12
Ø38.3
+0.1
0.52
14
-0.09
0
0.16
-0.12
0
0.18
3 Piping work and refrigerant charge
Piping work connection considerations
SMGB0091 rev.2 - 11/2015
33
3