11
Installation Pr
oc
edur
e
English
5
Check that the flaring is correct, referring to the illustrations
below for examples of incorrect flaring.
Correct
Inclined
Damaged
Surface
Cracked
Uneven
Thickness
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.
2
3
3
1
Spanner
Union
Torque wrench
Flare nut
Outer Diameter
Torque
mm
inch
N•m
lbf.ft
Ø6.35
1/4
14 to 18
10.3 to 13.3
Ø9.52
3/8
34 to 42
25.1 to 31.0
Ø12.70
1/2
49 to 61
36.1 to 45.0
Ø15.88
5/8
68 to 82
50.2 to 60.5
Ø19.05
3/4
100 to 120
73.8 to 88.5
(1 N•m = 10 kgf•cm)
NOTE
• 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.
Summary of Contents for AJ BNHDCH Series
Page 36: ......
