Operation Procedure - Haier AV08NMSETA Service Manual

■
diameter
Ø15.88
■
The outdoor gas pipe and the refrigerant distributing pipe, as well the refrigerant distributing pipe and the branch
pipe should be welded with hard solder.
■
When doing the braze connection, please do the following: Brazing the pipe at the same time charge the
nitrogen. Or it will cause a number of impurity (a film of oxidation) to clog the capillary and the expansion valve,
further cause the deadly failure.

Operation procedure

■
Brazing the pipe at the same time charge the nitrogen. Or it will cause a number of impurity (a film of oxidation)
to clog the capillary and the expansion valve, further cause the deadly failure.
■
Protect the pipe end against the water, impurity into the pipes (welding after being flat, or being sealed with
adhesive tape).
■
The refrigerant pipe should be clean. The nitrogen should flow under the pressure of about 0.5Mpa and when
charging the nitrogen, stop up the end of the pipe by hand to enhance the pressure in the pipe, then loose the
hand (meanwhile stop up the other end).
■
When connecting the pipes, close the valves fully.
■
When welding the valve and the pipes, use the wet cloth to cool down the valve and the pipes.
Expanding pipe: A (mm)
Pipe
0
outer
A
-0.4
(mm)
Ø6.35 9.1
Ø9.52 13.2
Ø12.7 16.6
19.7
Seal the pipe end with adhesive tape or the stopper to
increase the resistance, fill up the pipe with nitrogen.
Taping
Only nitrogen gas can
be used
Flat
Brazing
1st side
2nd side
Source valve
■
Projecting length of pipe to be expanded: B (mm)
Pipe outer
diameter
<N2>
Brazing
0.2MPa
Hand
34 34
When it is hard pipe
Special tool The former
(mm)
for R410A
Ø6.35
Ø9.52
0-0.5
Ø12.7
Ø15.88
Adhesive tape
tool
1.0-1.5