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14
English
•
When connecting the piping to the air conditioner, make sure to use a spanner and a torque wrench as
shown in
Fig. 21
.
For the dimension of flared part and the tightening torque, refer to the Table 1.
Table 1
CAUTION
Do not tighten flare nuts too tight.
If a flare nut cracks, the refrigerant may leak.
Insulation of field piping must be carried out up to the connection inside the casing.
If the piping is exposed to the atmosphere, it may cause sweating, burn due to touching the piping, electric
shocks or a fire due to the wiring touching the piping.
Example of unfavorable consequences
When tools other than spanners are used, the thread ridge of a flare nut will be damaged and cause gas
leakage due to defective tightening.
Piping size (mm)
Tightening torque (N·m)
Dimension for processing
flare A (mm)
Flare shape
φ
6.4
15.7 ± 1.5
8.9 ± 0.2
φ
9.5
36.3 ± 3.6
13.0 ± 0.2
φ
12.7
54.9 ± 5.4
16.4 ± 0.2
φ
15.9
68.6 ± 6.8
19.5 ± 0.2
Torque wrench
Spanner
Flare nut
Union joint
Fig. 21
R0.4-0.8
90°±2°
A
45°±2°
4PEN469441-1.book Page 14 Tuesday, March 21, 2017 1:49 PM