Haier AU48NFIBJA [31/126] A choosing of pipes

Haier AB092FCBIA [31/126] A choosing of pipes
Commercial Air Conditioner Model: AU242FHBIA,
AU482FIBIA, AU48NFIBJA
Durin
g
installation, if refri
g
eran
t
leaka
g
e occurs, take ventilatio
n
measurement immediately.
As soon as the leaked refri
g
erant
g
as meets fire,
p
oisonous
g
as will
generate.
After finishin
g
installation, confir
m
the refrigerant gas does not leak.
If the refri
g
erant
g
as leaks in the
room, once it meets heater, burne
r
and
g
as stove etc. fire source, the
poisonous gas will generate.
A. Choosing of pipes
According to the following indoor unit and outdoor unit installation diagram to choose the
material and size of pipes and branch pipes.
B. Connection of pipes
1 Method of pipe connection
a. The pipe shall be as short as possible to guarantee efficiency.
b. Daub the refrigerant oil on the connection and flare nut.
c. When bending the pipes, give the roundness as large as possible, to avoid crashing the
pipes.
d. To connect the pipe, fit the center and screw the nut with hand, then use spanner or
torque wrench to tighten it. The fastening torque as shown in below table. As shown in
figure.
e. Be careful alien matters, such as sands,
water etc. shall not enter the pipes.
2. Welding of pipes
a. In welding, the nitrogen shall be used to
avoid oxidation of the pipe inner part.
b. The refrigerating pipe shall use clean
new pipes. When working, it shall take steps to prevent water and dust from entering.
c. When loosening and tightening the nuts, two spanners shall be used. If using one
spanner, it can not reach the desired degree of tightness.
6.35 11.8 (1.2kgf.m) 13.7 (1.4kgf.m)
9.52 24.5 (2.5kgf.m) 29.4 (3.0kgf.m)
12.7 49.0 (5.0kgf.m) 53.9 (5.5kgf.m)
15.88 78.4 (8.0kgf.m) 98.0 (10.0kgf.m)
Forced fastening without
careful centering may damage
the threads and cause gas
Warning
Using the specified fastening torque to fasten nuts.
5.8 Special Work and Main Points in Installation
Pipe diameter (mm) Installation torque (N.M.) Fastening torque (N.M.)
-31-

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