21
Installation procedure
Note:
1. When connecting the outdoor branch pipe and the outdoor, please pay attention to the
outdoor pipe dimension.
2. When adjusting the diameter among outdoor branch pipe and among the units, please do
execute at the branch pipe side.
3. Please install the outdoor branch pipe (suction gas/HP gas/liquid side) in horizontal or vertical
direction.
4. When welding with hard solder, please do blow nitrogen. If not, a number of oxides will be
produced and cause heavy damage.Besides, prevent water and dust going into the pipe, please
make the brim as outer roll.
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 and water, impurities (welding after being flatted, 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 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 doing the flare 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 field
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)
