Haier AU282FHERA(H) Installation Manual page 13

Installation instruction
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.
Expanding pipe: A(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.
• 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.
• Protect the pipe end against the water, impurity into the pipes (welding after being flat, or being sealed with adhesive
tape).
• The refrigerant pipe should be clean. The nitrogen should flow under the pressure of about 0.2Mpa 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.
Pipe outer diameter
A
(mm)
Ø6.35
Ø9.52 13.2
Ø12.7 16.6
Ø15.88 19.7
Seal the pipe end with adhesive tape or the stopper to
increase the resistance, fill up the pipe with nitrogen.
Taping
Only nitrogen gas
can be used
Flat
Source valve
9.1
<N2>
Brazing
Brazing
1st side 2nd side
0.2MPa
Hand
11
Projecting length of pipe to be expanded: B(mm)
Pipe outer diameter
Special tool
(mm)
for R410A
Ø6.35
Ø9.52
Ø12.7
Ø15.88
Adhesive tape
When it is hard pipe
The former
tool
0-0.5 1.0-1.5