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CAUTION
• Ensure to wrap insulation around the piping.
Direct contact with the bare piping may result
in burns or frostbite.
• Make sure the pipe is properly connected. Over
tightening may damage the bell mouth and
under tightening may lead to leakage.
CAUTION
Check to make sure there is no refrigerant leak
after completing the installation work. If there
is a refrigerant leak, ventilate the area immedi-
ately and evacuate the system (refer to the Air
Evacuation section of this manual).
6. Place flaring tool onto the form.
7. Turn the handle of the flaring tool clock-
wise until the pipe is fully flared. Flare the
pipe in accordance with the dimensions
shown in table 7.3.
8. Remove the flaring tool and flare form,
then inspect the end of the pipe for cracks
and even flaring.
Step 4: Connect pipes
Connect the copper pipes to the indoor unit
first, then connect it to the outdoor unit. You
should first connect the low-pressure pipe,
then the high-pressure pipe.
1. When connecting the flare nuts, apply a
thin coat of refrigeration oil to the flared
ends of the pipes.
2. Align the center of the two pipes that you
will connect.
6. After connecting the copper pipes to the in-
door unit, wrap the power cable, signal cable
and the piping together with binding tape.
7. Thread this pipeline through the wall and
connect it to the outdoor unit.
8. Insulate all the piping, including the valves
of the outdoor unit.
9. Open the stop valves of the outdoor unit
to start the flow of the refrigerant between
the indoor and outdoor unit.
3. Tighten the flare nut as tightly as possible
by hand.
4. Using a spanner, grip the nut on the unit
tubing.
5. While firmly gripping the nut, use a torque
wrench to tighten the flare nut according
to the torque values in table 7.5.
90°± 4
R0.4~0.8
45°± 2
Indoor unit tubing
min-radius 10cm (3.9”)
Bend the pipe with thumb
Flare nut
Pipe
Table 7.3: PIPING EXTENSION BEYOND FLARE
FORM
Pipe
gauge
Tightening
torque
Flare dimension (A)
(Unit: mm/inch)
Flare shape
Min.
Max.
Ø 6.4
18-20 N.m
(183-204 kgf.cm) 8.4/0.33
8.7/0.34
Ø 9.5
25-26 N.m
(255-265 kgf.cm) 13.2/0.52 13.5/0.53
Ø 12.7
35-36 N.m
(357-367 kgf.cm) 16.2/0.64 16.5/0.65
Ø 15.9
45-47 N.m
(459-480 kgf.cm) 19.2/0.76 19.7/0.78
Ø 19.1
65-67 N.m
(663-683 kgf.cm) 23.2/0.91 23.7/0.93
Ø 22
75-85N.m
(765-867 kgf.cm) 26.4/1.04 26.9/1.06
Fig. 7.8
Fig. 7.9
Fig. 7.10
Fig. 7.11
NOTE:
Use both a spanner and a torque
wrench when connecting or disconnecting
pipes to/from the unit.
NOTE: DO NOT
intertwine signal cable with
other wires. While bundling these items to-
gether, do not intertwine or cross the signal
cable with any other wiring.
NOTE ON MINIMUM BEND RADIUS
Carefully bend the tubing in the middle ac-
cording to the diagram below. DO NOT bend
the tubing more than 90° or more than 3
times.