36 MS-SVN056C-EN
Outdoor Unit Installation
Procedure for pipe connection
1. Measure the required length of tube connection and proceed as follows. First
connect the indoor unit; then connect the outdoor unit.
– Fold the pipe appropriately. Do not twist the tube.
– Apply refrigerant oil on the surface of the flared pipe and on the union nuts; using hands, apply
tightening torque for 3 to 4 turns, before using the wrench.
– Employ two open-end wrenches simultaneously to connect or disconnect piping
• Outdoor unit service valves must be totally closed (original state). In order to connect them, loosen the
nuts and connect flared tubes in a timing not to exceed 5 minutes. If nuts remain loose during extended
time, it could lead to dust and other debris entering the system and consequently causing a system
malfunction. Therefore, before the final connection, purge air from the refrigerant line.
• Purge air after connecting the refrigerant line to both indoor unit and outdoor unit. Tighten nuts on the
service valves.
• Fold the thin-walled connecting tube.
– Cut the insulation material insulating material all over the pipe on the section to be folded.
– Expose the pipe. Proceed to fold it. Once folded, cover it completely with insulating material
– In order to prevent pipe from deforming or twisting, fold it at a suitable radius.
Tube
Diameter
Tightening Torque
Flare dimension (A)
(mm/inch) Flaring
Min. Max.
φ 6.4
14.2 + 17.2 N.m.
(144-176 kgf.cm)
8.3/0.3 8.3/0.3
φ 9.5
32.7 + 39.9 N.M
(333-407 kgf.cm)
12.4/0.48 12.4/0.48
φ 12.7
49.5 + 60.3 N.M
(504-616 kgf.cm)
15.4/0.6 15.8/0.6
φ 15.9
61.8 + 75.4 N.M
(630-770 kgf.cm)
18.6/0.7 19/0.74
φ 19.1
97.2 + 118.6 N.M
(990-1210 kgf.cm)
22.09/0.9 23.3/0.91
φ 22
109.5 + 133.7 N.M
(1117-1364 kgf.cm)
27/1.06 27.3/1.07
Fold pipe using thumbs at a
minimum radius of 100mm/3.94in
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