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Pipe
Point down
Fig. 7.2
Step 3: Flare pipe ends
Proper flaring is essential to achieve an airtight
seal.
1. After removing burrs from cut pipe, seal
the ends with PVC tape to prevent foreign
materials from entering the pipe.
2. Sheath the pipe with insulating material.
3. Place flare nuts on both ends of pipe.
Make sure they are facing in the right
direction, because you can't put them on
or change their direction after flaring.
See Fig. 7.3
Flare nut
Copper pipe
4. Remove PVC tape from ends of pipe when
ready to perform flaring work.
5. Clamp flare form on the end of the pipe. The
end of the pipe must extend beyond the flare
form.
Flare form
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 7.1.
Reamer
Fig. 7.3
Pipe
Fig. 7.4
Table 7.1: PIPING EXTENSION BEYOND FLARE
FORM
Pipe
Tightening
torque
gauge
18-20 N.m
Ø 6.4
(183-204 kgf.cm)
25-26 N.m
Ø 9.5
(255-265 kgf.cm)
35-36 N.m
Ø 12.7
(357-367 kgf.cm)
45-47 N.m
Ø 15.9
(459-480 kgf.cm)
65-67 N.m
Ø 19.1
(663-683 kgf.cm)
75-85N.m
Ø 22
(765-867 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
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 7.1.
50
Flare dimension (A)
Flare shape
(Unit: mm/Inch)
Min.
Max.
90 ° ± 4
8.4/0.33
8.7/0.34
13.2/0.52
13.5/0.53
16.2/0.64
16.5/0.65
19.2/0.76
19.7/0.78
Fig. 7.5
23.2/0.91
23.7/0.93
26.4/1.04
26.9/1.06
Flare nut
Fig. 7.6
A
R0.4~0.8
Pipe
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