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Step 3: Flare Pipe Ends
Proper flaring is essential in achieving an
airtight seal.
1. After removing burrs from the cut pipe, seal
the ends with PVC tape, to prevent foreign
materials from entering into the pipe.
2.
Sheath the pipe with insulating material.
3.
Place flare nuts on both ends of pipe.
Make sure that they are facing the correct
direction, because they cannot be put on
or have their direction changed after flaring.
See Fig. 7.6
Flare Nut
Copper Pipe
Fig. 7.6
4. Remove PVC tape from pipe ends when
ready to perform flaring work.
Refrigerant Piping
Connection
5. Clamp flare form onto the end of the pipe.
The end of the pipe must extend beyond
the flare form.
Flare Form
Pipe
Fig. 7.7
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 7.5.
8.
Remove the flaring tool and flare form, and
inspect the end of the pipe for cracks and for
even flaring.
Step 4: Connect the Pipes
First connect the copper pipes to the indoor unit,
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
Flare Nut
Pipe
Fig. 7.9
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.
Page 21
PIPING EXTENSION BEYOND FLARE FORM
Pipe
Gauge
Tightening
Torque
Flare Dimension (A)
(Unit: mm/Inch)
Flare Shape
Min. Max .
Ø 1/4
14.2-17.2 N.m
(10.5 - 12.5 Lb.Ft.)
8.3/0.3 8.3/0.3
R0.4~0. 8
45
°
±
2
90
°
±
4
A
Fig. 7.6
Ø 3/8
32.7-39.9 N.m
(24 - 30 Lb.Ft.)
12.4/0.5 12.4/0.5
Ø 1/2
49.5-60.3 N.m
(36 - 45 Lb.Ft.)
15.4/0.6 15.8/0.6
Ø 5/8
61.8-75.4 N.m
(45 - 52 Lb.Ft.)
18.6/0.7 19/0.74
Ø 3/4
97.2-118.6 N.m
(72 - 88 Lb.Ft.) 22.9/0.9 23.3/0.9
Ø 7/8
109.5-133.7 N.m
(81 - 102 Lb.Ft.) 27/1.06 27.3/1.07
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