22
Installation procedure
•
The outdoor suction gas pipe /HP gas pipe and the refrigerant distributing pipe, as well as the
refrigerant distributing pipe and the branch pipe should be welded with hard solder.
•
When doing the braze connection, please do the following: Braze the pipe while charging the
nitrogen. 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
•
Braze the pipe and charge the nitrogen at the same time. 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 water and impurities (welding after being flatted, 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.
Seal the pipe end with adhesive tape or the stopper to
increase the resistance, fill up the pipe with nitrogen.
Only nitrogen gas
can be used
Brazing
Flat
Brazing
Adhesive tape
<N2>
Taping
1st side
Hand
2nd side
Source valve
0.2MPa
