Hitachi UTOPIA R32 Series User Manual

20
PMEN0654 rev.0 - 12/2023
5
GENERALINSTRUCTIONSONTHEINSTALLATIONOFREFRIGERANTPIPES
REFRIGERANT PIPING AND REFRIGERANT CHARGE
5.4.4 Brazing copper refrigerant pipes
Brazing is the most important job in the installaon of refrigeraon pipes. In the event of an
accidental leak due to negligence during the brazing process, the capillary tubes, expansion valves,
etc., will be obstructed or the compressor seriously damaged.
To guarantee correct brazing between pipe surfaces, prepare them for widening according to the
data in the following table.
! CAUTION
• It is important to check the pipe ng 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 (C) Ød1
Tolerance between d1
and C
a
(Unit: mm)
Ø6.35
+0.08
/
-0.08
Ø6.5
+0.1
/
0
+0.33
/
0.07
6
a
d1
C
Ø9.52
+0.08
/
-0.08
Ø9.7
+0.1
/
0
+0.36
/
0.10
8
Ø12.7
+0.08
/
-0.08
Ø12.9
+0.1
/
0
+0.38
/
0.12
8
Ø15.88
+0.09
/
-0.09
Ø16.1
+0.1
/
0
+0.41
/
0.13
8
Ø19.05
+0.09
/
-0.09
Ø19.3
+0.1
/
0
+0.44
/
0.16
10
Ø22.22
+0.09
/
-0.09
Ø22.42
+0.1
/
0
+0.39
/
0.11
10
Ø25.4
+0.12
/
-0.12
Ø25.6
+0.1
/
0
+0.42
/
0.08
12
Ø28.58
+0.12
/
-0.12
Ø28.78
+0.1
/
0
+0.42
/
0.08
12
Ø31.75
+0.12
/
-0.12
Ø32.0
+0.1
/
0
+0.47
/
0.13
12
Ø38.1
+0.12
/
-0.12
Ø38.3
+0.1
/
0
+0.42
/
0.08
14
The necessary brazing must be done by brazing, using a copper and silver alloy. Before you start
brazing, install a dry nitrogen gas injecon system inside the pipes to prevent the copper from
being exposed to the air while it is subjected to high temperatures.
1
Heat the outer pipe previously to ensure the ller metal
ows 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
2
G).
7
Reducer valve: only open the valve when gas is required.
8
Nitrogen gas ow, 0.05 m
3
/h or less.

Hitachi UTOPIA R32 Series Specifications

General

Brand	Hitachi
Model	UTOPIA R32 Series
Category	Air Conditioner
Language	English