Refrigerant Piping Connection MCAC-UTSM-2008-05
88 Installation
How to connect the pipes
1. Flaring:
Cut a pipe with a pipe cutter.
Insert a flare nut into a pipe and flare the pipe.
Refer to the following table for the dimension of flare nut spaces.
Flare dimension (A)
Pipe gauge Tightening torque
Min Max
Flare shape
Φ6.4
14.2～17.2 N.m
(144～176 kgf.cm)
8.3 8.7
Φ9.5
32.7～39.9 N.m
(333～407 kgf.cm)
12.0 12.4
Φ12.7
49.5～60.3 N.m
(504～616 kgf.cm)
15.4 15.8
Φ15.9
61.8～75.4 N.m
(630～770 kgf.cm)
18.6 19.0
Φ19.1
97.2～118.6 N.m
(990～1210 kgf.cm)
22.9 23.3
2. Connect the indoor unit at first, then the outdoor unit.
z Bend the tubing in proper way. Do not harm to them.
z The bending angle should not exceed 90.
z Bending position is preferably in the middle of the bendable pipe. The larger the bending radius the
better it is.
z Do not bend the pipe more than three times.
z When connecting the flare nut, coat the flare both inside and outside with either oil or ester oil and
initially tighten by hand 3 or 4 turns before tighting firmly.
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