10
Piping installation
Please don't let the pipe and the parts in the unit collide each other.
The connection between outdoor liquid pipe and the distributing pipe is flared type. Please
expand the pipe with the special tool for R410A after installing the expanding nut. But if the
projecting pipe length has been adjusted with the copper pipe gauge, you can use the original
tool to expand the pipe.
Since the unit is with R410A, the expanding oil is ester oil, not the mineral oil.
When connecting the pipes, close the valves fully.
Protect the pipe end against the water, impurity into the pipes (welding after being flat,
or being sealed with adhesive tape).
Bend the pipe as large semi-diameter as possible(over 4 times of the pipe diameter).
When connecting the expanding pipe, fasten the pipes with double-spanner. The torque refers
to the former info.
Important
A
0
-0.4
6.35
9.52
12.7
15.88
9.1
13.2
16.6
19.7
Expanding pipe:A(mm)
pipe outer
diameter
Projecting length of pipe to be expanded:B(mm)
6.35
9.52
12.7
15.88
when it is hard pipe
0-0.5
1.0-1.5
pipe outer
diameter special tool
for R410A
the former
tool
welding
adhesive tape
flat
Protect the pipe end against the water, impurity into the pipes (welding after being flat, or being
sealed with adhesive tape).
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
brazing
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.
Weld 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.
Installation procedure
