Haier AU282FHERA [25/69] Piping installation

8.5 Piping installation

Important

■ 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 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 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 connecting the expanding pipe, fasten the pipes with double-spanner. The torque refers to the former info.

Expanding pipe: A (mm)

Pipe outer

diameter

A 0-0.4

φ 6.35 9.1

φ 9.52 13.2

φ 12.7 16.6

φ15.88 19.7

Projecting length of pipe to be expanded: B (mm)

Pipe outer

diameter

When it is hard pipe

Special tool

for R410A

The former

tool

φ 6.35

0-0.5 1.0-1.5

φ 9.52

φ 12.7

φ15.88

■ 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 lm of oxidation) to

clog the capillary and the expansion valve, further cause the deadly failure.

Taping

Brazing

■ Protect the pipe end against the water, impurity into the pipes (welding after being at, or being sealed with

adhesive tape).

Flat

Welding

Adhesive tape