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6.
Place flaring tool onto the form.
7.
Turn the handle of the flaring tool clockwise until
the pipe is fully flared. Flare the pipe in accordance
with the dimensions shown in table 7-3.
Table 7.3: PIPING EXTENSION BEYOND FLARE FORM
Pipe
Tightening
Flare dimension (A)
torque
(Unit: mm/Inch)
gauge
Min.
14.2-17.2 N.m
Ø 6.4
8.3/0.3
(144-176 kgf.cm)
32.7-39.9 N.m
Ø 9.5
12.4/0.48
(333-407 kgf.cm)
49.5-60.3 N.m
Ø 12.7
15.4/0.6
(504-616 kgf.cm)
61.8-75.4 N.m
Ø 15.9
18.6/0.7
(630-770 kgf.cm)
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.
Indoor unit tubing
Fig. 7.7
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-.3.
NOTE: Use both a spanner and a torque wrench when
connecting or disconnecting pipes to/from the unit.
Fig. 7.8
Flare shape
Max .
4
90
8.3/0.3
A
12.4/0.48
R0.4~0.8
15.8/0.6
19/0.74
Fig. 7.6
Pipe
Flare nut
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.
NOTE ON MINIMUM BEND RADIUS
Carefully bend the tubing in the middle according to the
diagram below. DO NOT bend the tubing more than
90° or more than 3 times.
Bend the pipe with thumb
min-radius 10cm (3.9")
Fig. 7.9
6.
After connecting the copper pipes to the indoor
unit, wrap the power cable, signal cable and the
piping together with binding tape.
NOTE: DO NOT intertwine signal cable with other wires.
While bundling these items together, do not intertwine
or cross the signal cable with any other wiring.
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.
CAUTION
Check to make sure there is no refrigerant leak after
completing the installation work. If there is a refrigerant
leak, ventilate the area immediately and evacuate
the system (refer to the Air Evacuation section of this
manual).
Page 17
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