5
2)
Fastening nut
Align the connecting pipe, tighten it by hand, and then by a wrench.
·
To prevent the copper pipe from internal oxidation upon welding, the copper pipe shall be filled with nitrogen. Otherwise, the oxide skin will block
the refrigeration system!
·
When fastening the nut, too strong force will damage the flared socket, but too weak force will result in leakage. Please refer to the tightening
torque in the table above to fasten the nuts!
!
NOTE
Fig. 4-2 Tightening Schematic Diagram
Table 4-2 Tightening Torque
Pipe Dimension (mm)
Tightening Torque (Nm)
Φ
6 4
.
Φ
9 5
.
Φ
12 7
.
Φ
15 9
.
32 7 39 9 333 407 kgf cm
. ～
. (
～
•
)
49 5 60 3 504 616
kgf cm
. ～
. (
～
•
)
14 2 17 2 144 176 kgf cm
. ～
. (
～
•
)
61
.
8
～
75
.
4
(
630
～
770
kgf
•
cm
)
