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5 Check that the flaring is correct, referring to the
illustrations below for examples of incorrect flaring.
Damaged
Inclined
Correct
Surface
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 and 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.
1
Spanner
3
Union
Cracked
Uneven
Thickness
2
Torque
wrench
3
Flare nut
Outer Diameter (D)
mm
in.
6.35
1/4
9.52
3/8
12.7
1/2
15.88
5/8
19.05
3/4
NOTE
• If the pipes must be shortened, see Step 6 Cutting
and flaring the pipes on page 10.
2 Be sure to use an insulator thick enough to cover the
refrigerant tube to protect the condensate water on
the outside of the pipe falling onto the floor and to
improve the efficiency of the unit.
3 Cut off any excess foam insulation.
4 Make sure that there are no cracks or waves on the
bent area.
5 It would be necessary to double the insulation
thickness (10 mm (0.39 in.) or more) to prevent
condensation even on the insulator when if the
installed area is warm and humid.
6 Do not use joints or extensions for the pipes
connecting the indoor and outdoor units. The only
permitted connections are those for which the units
are designed.
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
English
11
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