Table of Contents
Advertisement
3 Piping work and
refrigerant charge
To guarantee correct brazing between pipe surfaces, prepare them for widening according to the data in the following table.
C A U T I O N
•
It is important to check the pipe fitting measurement as indicated in the following table.
•
If a tool is used to widen the copper pipe, the dimensions indicated must be respected.
Copper pipe size
+0.08
Ø6.35
+0.08
Ø9.53
+0.08
Ø12.7
+0.09
Ø15.88
+0.09
Ø19.05
+0.09
Ø22.22
+0.12
Ø25.4
+0.12
Ø28.58
+0.12
Ø31.75
+0.12
Ø38.1
The necessary brazing must be done by brazing, using a copper and silver alloy.
Before you start brazing, install a dry nitrogen gas injection system inside the pipes to prevent the copper from being exposed
to the air while it is subjected to high temperatures.
C A U T I O N
•
Do not braze on gas refrigerant pipes without a dry nitrogen gas injection system.
•
Otherwise, a layer of rust will form that may become detached when the refrigeration system is started, causing
filter or compressor blockages.
•
NEVER USE oxygen, acetylene or fluorocarbonated gas to replace nitrogen gas: this will cause an explosion
or will generate toxic gas.
1. Heat the outer pipe previously to ensure the filler metal flows
more easily.
2. Heat the inner pipe evenly.
3. Rubber cap.
4. Valve with no packing.
5. High pressure pipe.
6. 0.03 to 0.05 MPa (0.3 to 0.5 kg/cm
7. Reducer valve: only open the valve when gas is required.
8. Nitrogen gas flow, 0.05 m
C A U T I O N
Keep the nitrogen gas pressure within the indicated values. A rise in pressure in the pipe could cause an explosion.
86
SMGB0063 rev. 1 - 10/2010
/
-0.08
/
-0.08
/
-0.08
/
-0.09
/
-0.09
/
-0.09
/
-0.12
/
-0.12
/
-0.12
/
-0.12
2
G).
3
/h or less.
Ød1
+0.1
Ø6.5
/
0
+0.1
Ø9.7
/
0
+0.1
Ø12.9
/
0
+0.1
Ø16.1
/
0
+0.1
Ø19.3
/
0
+0.1
Ø22.42
/
0
+0.1
Ø25.6
/
0
+0.1
Ø28.78
/
0
+0.1
Ø32.0
/
0
+0.1
Ø38.3
/
0
Tolerance
a
+0.33
/
6
0.07
+0.35
/
8
0.09
+0.38
/
8
0.19
+0.41
/
8
0.13
+0.44
/
10
0.16
+0.39
/
10
0.11
+0.42
/
12
0.08
+0.42
/
12
0.08
+0.47
/
12
0.13
+0.52
/
14
0.18
Hide quick links:
Advertisement
Table of Contents
