Haier AU55NFIAIA Service Manual page 34

5.8 Special Work and Main Points in Installation
During installation, if refrigerant
l
leakage occurs, take ventilation
measurement immediately.
l As soon as the leaked refrigerant
gas meets fire, 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
he pipe shall be as short as possible to guarantee efficiency.
a. T
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.
Forced fastening
careful centering may damage
the threads and cause gas
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.
Using the specified fastening torque to fasten nuts.
Pipe diameter (mm)
6.35
9.52
12.7
15.88
Commercial Air Conditioner
Warning
l After finishing installation, confirm
the refrigerant gas does not leak.
l If the refrigerant gas leaks in the
room, once it meets heater, burner
and gas stove etc. fire source, the
poisonous gas will generate.
without
Installation torque (N.M.)
11.8 (1.2kgf.m)
24.5 (2.5kgf.m)
49.0 (5.0kgf.m)
78.4 (8.0kgf.m)
- 33 -
Model: AU55NFIAIA
Fastening torque (N.M.)
13.7 (1.4kgf.m)
29.4 (3.0kgf.m)
53.9 (5.5kgf.m)
98.0 (10.0kgf.m)