En-9
4-1. FLARE CONNECTION
1) Cut the copper pipe as straight as possible with a pipe cutter. (Fig. 1, 2)
2) Remove all burrs from the cut section of the pipe, ensuring that precautions
are taken to avoid getting metal shavings into the piping. (Fig. 3)
3) Remove flare nuts attached to indoor and outdoor units, then put them on
pipe.
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown in the
table. Select A inch (mm) from the table according to the tool you use.
5) Check
• Compare the flared work with Fig. 6.
• If flare is defective, cut off the section and repeat procedure.
Pipe
diameter
inch (mm)
B inch
(mm)
A inch (mm)
Tightening torque
Clutch
type tool
for R410A
Clutch
type tool
for R22
Wing nut
type tool
for R22
ft-lb
(kgf•cm)
N•m
ø 1/4
(6.35)
21/32
(17)
0 to 0.02
(0 to 0.5)
0.04 to
0.06
(1.0 to 1.5)
0.06 to
0.08
(1.5 to 2.0)
10 to 13
(140 to 180)
13.7 to
17.7
ø 3/8
(9.52)
7/8 (22)
25 to 30
(350 to 420)
34.3 to
41.2
ø 1/2
(12.7)
1-1/32
(26)
0.08 to
0.10
(2.0 to 2.5)
36 to 42
(500 to 575)
49.0 to
56.4
ø 5/8
(15.88)
1-5/32
(29)
54 to 58
(750 to 800)
73.5 to
78.4
4. FLARE CONNECTION, PIPE CONNECTION
Copper
pipe
Good
90°
Tilted
No good
Fig. 1
Burr
Copper pipe
Spare reamer
Pipe cutter
Fig. 4
Smooth all around
Even length
all around
Inside is
shining
without any
scratches.
Fig. 6
Clutch type
Flaring tool
Wing nut type
Uneven Burred
B
Flare nut
Die
Copper pipe
Fig. 2
Fig. 3
Fig. 5
4-2. PIPE CONNECTION
• Fasten flare nut with a torque wrench as specified in the table (refer to 3-2.).
• When fastened too tight, flare nut may eventually break and cause refrigerant
leakage.
• Be sure to wrap insulation around the piping. Direct contact with the bare
piping may result in burns or frostbite.
Indoor unit connection
Connect both liquid and gas pipings to indoor unit.
• Apply a thin coat of refrigeration oil (K) on the flared ends of the pipes. Do
not apply refrigeration oil on screw threads. Excessive tightening torque will
result in damage on the screw.
• To connect, first align the center, then tighten the first 3 to 4 turns of flare nut.
• Use tightening torque table above as a guideline for indoor unit side joints, and
tighten using two wrenches. Excessive tightening damages the flare section.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit following the same
procedure detailed in indoor unit connection.
• For tightening, use a torque wrench or spanner.
WARNING
When installing the unit, securely connect the refrigerant pipes before
starting the compressor.
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