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• When doing the are 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.
• Charge nitrogen when brazing the pipe, or it will cause a number of impurities (a lm of oxidation) to clog the
capillary and the expansion valve, further cause the deadly failure.
• When doing the braze connection, please do the following: Charge nitrogen when brazing the pipe, or it will
cause a number of impurities (a lm of oxidation) to clog the capillary and the expansion valve, further cause the
deadly failure.
Operation procedure
• Protect the pipe end against the water and impurity going into the pipes (brazing after being atted, or sealed with
adhesive tape).
• 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.
• 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).
Pipe outer
diameter
(mm)
A
6.35 9.1
9.52 13.2
12.7 16.6
15.88 19.7
Expanding pipe:A(mm)
Pipe outer
diameter
(mm)
When it is hard pipe
Special tool
for R-410A
The former
tool
6.35
0-0.5 1.0-1.5
9.52
12.7
15.88
Projecting length of pipe to be expanded:B(mm)
Seal the pipe end with adhesive tape or the stopper to
increase the resistance, ll up the pipe with nitrogen.
Only nitrogen gas
can be used
brazing
<N2>
taping
at
brazing
adhesive tape
1st side
hand
2nd side
source valve
0.2MPa
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