5
4. Installing the refrigerant piping
4.1. Precautions
For devices that use R410A refrigerant
• Use ester oil, ether oil or alkylbenzene oil (small amount) as the refrigera-
tion oil applied to the
fl
ared sections.
• Use C1220 copper phosphorus for copper and copper alloy seamless
pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thick-
nesses speci
fi
ed in the table below. Make sure the insides of the pipes are
clean and do not contain any harmful contaminants such as sulfuric com-
pounds, oxidants, debris, or dust.
Warning:
When installing or moving the air conditioner, use only the speci
fi
ed refriger-
ant (R410A) to charge the refrigerant lines. Do not mix it with any other refrig-
erant and do not allow air to remain in the lines. Air enclosed in the lines can
cause pressure peaks resulting in a rupture and other hazards.
RP35, 50
RP60-140
Liquid pipe
[
6.35 thickness 0.8 mm
[
9.52 thickness 0.8 mm
Gas pipe
[
12.7 thickness 0.8 mm
[
15.88 thickness 1.0 mm
• Do not use pipes thinner than those speci
fi
ed above.
4.2. Connecting pipes (Fig. 4-1)
• When commercially available copper pipes are used, wrap liquid and gas pipes
with commercially available insulation materials (heat-resistant to 100 °C or
more, thickness of 12 mm or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam in-
sulation materials (speci
fi
c gravity of 0.03, thickness of 9 mm or more).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tighten-
ing
fl
are nut.
• Use 2 wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections. In-
sulate carefully.
B
Flare nut tightening torque
Copper pipe O.D.
(mm)
Flare nut O.D.
(mm)
Tightening torque
(N·m)
[
6.35
17
14-18
[
6.35
22
34-42
[
9.52
22
34-42
[
12.7
26
49-61
[
12.7
29
68-82
[
15.88
29
68-82
[
15.88
36
100-120
[
19.05
36
100-120
C
Apply refrigerating machine oil over the entire
fl
are seat surface.
D
Use correct
fl
are nuts meeting the pipe size of the outdoor unit.
Available pipe size
RP35, 50
RP60
RP71-140
Liquid side
[
6.35
Ο
[
6.35
—
—
[
9.52
Ο
[
9.52
Ο
Gas side
[
12.7
Ο
[
15.88
Ο
[
15.88
Ο
Ο
: Factory
fl
are nut attachment to the heat exchanger.
Flare cutting dimensions
Copper pipe O.D.
Flare dimensions
(mm)
:
A dimensions (mm)
:
6.35
8.7 - 9.1
:
9.52
12.8 - 13.2
:
12.7
16.2 - 16.6
:
15.88
19.3 - 19.7
:
19.05
23.6 - 24.0
90
0.5
A
R0.4~R0.8
45 2
Fig. 4-1
Die
Copper pipe
B
Fig. 4-2
Copper pipe O.D.
B (mm)
(mm)
Flare tool for R410A
Clutch type
:
6.35 (1/4")
0 - 0.5
:
9.52 (3/8")
0 - 0.5
:
12.7 (1/2")
0 - 0.5
:
15.88 (5/8")
0 - 0.5
:
19.05 (3/4")
0 - 0.5
01̲RG79D510K01̲EN.indd 5
2008/12/10 10:42:38
