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The connection method of the rightward
outlet pipe.
Liquid side piping
Gas side piping
(field piping)
5.4.5 Brazing
CAUTION
During the test, do not exert a force greater
than the maximum allowed pressure on the
product (as shown on the nameplate).
During brazing, use nitrogen as protection to prevent
the formation of a large amount of oxide film in the
pipes. This oxide film will have adverse effects on the
valves and compressors in the cooling system, and
may hamper normal operations.
Use the pressure reducing valve to set the nitrogen
pressure to 0.02~0.03 MPa (a pressure that can be
felt by the skin).
Brazing part
Nitrogen
Copper pipe,
Copper pipe Taping
fittings
Do not use antioxidants when brazing the pipe joints.
Use copper-phosphorus alloys (BCuP) when brazing
copper and copper, and no flux is required. When
brazing copper and other alloy, flux is required.
Flux produces an extremely harmful effect on the
refrigerant piping system. For example, using a
chlorine-based flux is used may corrode the pipes,
and when the flux contains fluorine, it will degrade
the frozen oil.
Fig. 5.23
Copper pipe,
1/4"
Packless valve
High pressure
hose for nitrogen
filling
Fig. 5.24
5.4.6 About stop valves
Stop valves
The following figure shows the names of all parts
required for the installation of the stop valves.
Stop valves are closed when unit is shipped from the
factory.
Service port cover
Stop valve stem
Stop valve cover
e
d
a
b
c
Using of stop valve
1. Remove the stop valve cover.
2. Insert the hex wrench into the stop valve, and rotate
the stop valve counter-clockwise.
3. Stop turning when the stop valve cannot be rotated
further.
Result: Valve is now open.
The fastening torque of the stop value is shown in table
5-5. Insufficient torque may cause the refrigerant to leak.
2
1
4
Closing the stop valve
1. Remove the stop valve cover.
2. Insert the hex wrench into the stop valve, and rotate
the stop valve clockwise.
3. Stop turning when the stop valve cannot be rotated
further.
Result: Valve is now closed.
Direction to close:
23
Fig. 5.25
a
Sealing component
b
Axis
c
Hexagonal hole
d
Stop valve cover
service port
e
Fig. 5.26
3
Fig. 5.27
Fig. 5.28
V.1
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