Haier AV10IMWEWA Design, Installation & Maintenance Instruction page 225

• When doing the flare connection, please do the following: When connecting the expanding pipes, fasten the pipes
with double spanners. The torque refers to the former info.
• The connection of outdoor gas pipe and the refrigerant distributing pipe, as well as the connection of refrigerant
distributing pipe and the branch pipe should be welded with hard solder.
• When doing the braze connection, please do the following: Charge nitrogen when brazing the pipe, or it will
cause a number of impurities (a film of oxidation) to clog the capillary and the expansion valve, further cause the
deadly failure.
Operation procedure
• Charge nitrogen when brazing the pipe, or it will cause a number of impurities (a film of oxidation) to clog the
capillary and the expansion valve, further cause the deadly failure.
• Protect the pipe end against the water and impurity going into the pipes (brazing after being flatted, or sealed with
adhesive tape).
• The refrigerant pipe should be clean. The nitrogen should be charged 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 outer
diameter A
(mm)
6.35 9.1
9.52 13.2
12.7 16.6
15.88 19.7
Seal the pipe end with adhesive tape or the stopper to
increase the resistance, fill up the pipe with nitrogen.
<N2>
taping
Only nitrogen gas
can be used
flat
brazing
1st side
source valve
Projecting length of pipe to be expanded:B(mm)
Pipe outer
diameter
(mm)
6.35
9.52
12.7
15.88
brazing
2nd side
0.2MPa
hand
224
When it is hard pipe
Special tool The former
for R-410A tool
0-0.5 1.0-1.5
adhesive tape