16
Installation procedure
Pipe installation
When doing the piping connection, please do the following:
• Please don't let the pipe and the parts in the unit collide each other.
• When connecting the pipes, close the valves fully.
• Protect the pipe end against the water, impurity into the pipes (welding after being
fl
at, or
being sealed with adhesive tape).
• Bend the pipe as large semi-diameter as possible(over 4 times of the pipe diameter).
• The connection between outdoor liquid pipe and the distributing pipe is
fl
ared 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 doing the
fl
are connection, please do the following: When connecting the expanding
pipe, fasten the pipes with double-spanner. The torque refers to the former info.
Adhesive side
Prepare on
fi
eld
Seal the connection and wrap the
heat insulator with adhesive tape
Cut off pipe with the cutter
Floor
Floor
Right
Horizontal
Cut off at the middle
Wrong
Pipe outer
diameter
(mm)
A
Ø6.35
9.1
Ø9.52
13.2
Ø12.7
16.6
Ø15.88
19.7
Expanding pipe:A(mm)
Pipe outer
diameter
(mm)
When it is hard pipe
Special tool
for R410A
The former
tool
Ø6.35
0-0.5
1.0-1.5
Ø9.52
Ø12.7
Ø15.88
Projecting length of pipe to be expanded:B(mm)
• 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
fi
lm of oxidation) to clog the
capillary and the expansion valve, further cause the deadly failure.
