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5 Check that the flaring is correct, referring to the illustrations
below for examples of incorrect flaring.
Damaged
Correct
Inclined
Surface
CAUTION
• If the pipes require brazing ensure that OFN (Oxygen Free
Nitrogen) is flowing through the system.
• Nitrogen blowing pressure range is 0.02 ~ 0.05 MPa.
Step 7 Connecting the assembly pipes to
the refrigerant pipes
There are two refrigerant pipes of different diameters :
• A smaller one for the liquid refrigerant
• A larger one for the gas refrigerant
• The inside of copper pipe must be clean & has no dust
1
Remove the pinch pipe on the pipes and connect the assembly
pipes to each pipe, tightening the nuts, first manually and then
with a torque wrench, a spanner applying the following torque.
Uneven
Cracked
Thickness
• If the pipes must be shortened refer to page 10,
Step 6 Cutting and flaring the pipes
• Tighten the nuts to the specified torques. If overtightened,
the nuts could be broken so refrigerant may leak.
1
2
Spanner
3
Union
Outer Diameter
mm
inch
Ø6.35
1/4
Ø9.52
3/8
Ø12.70
1/2
Ø15.88
5/8
Ø19.05
3/4
NOTE
Torque wrench
3
Flare nut
Torque
N•m
lbf.ft
14 to 18
10.3 to 13.3
34 to 42
25.1 to 31.0
49 to 61
36.1 to 45.0
68 to 82
50.2 to 60.5
100 to 120
73.8 to 88.5
(1 N•m = 10 kgf•cm)
English
11
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