15.2 PIPING CONNECTION
1
Flaring Work
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below.
• Flare Pipe Dimensions
mm (in.)
0.4 ~ 0.8R
I
A
I
d
90
o
+ 2
o
45
o
+ 2
o
Diameter
Ø
d
A
+0
-0.4
6.35 (1/4)
9.1
9.52 (3/8)
13.2
12.7 (1/2)
16.6
15.88 (5/8)
19.7
• Thickness of Copper Pipe
(mm)
Diameter
Ø
d
Thickness
6.35
0.8
9.52
0.8
12.7
0.8
15.88
1.0
• Flare Nut Dimensions
(mm)
B
Flare nut
Diameter
Ø
d
B
6.35
17
9.52
22
12.7
26
15.88
29
2
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3
Check that there are no scratches, adhered grinding swarf,
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4
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work, check that there is no refrigerant leakage.
N O T E
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Do not apply the
refrigerant oil to the
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part
Apply refrigerant oil
Required tightening torque
-,6%
Pipe size
Tightening torque
Ø6.35 (1/4)
14 - 18 (N-m)
Ø9.52 (3/8)
34 - 42 (N-m)
Ø12.7 (1/2)
49 - 61 (N-m)
Ø15.88 (5/8)
68 - 82 (N-m)
N O T E
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C A U T I O N
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5
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~ 10mm thickness) around the accessory insulation of the
refrigerant pipe as a preventive measure.
6
For buried pipe with joints such as an elbow or a socket,
provide service access doors to facilitate the check for
connection.
7
The pipes must be reinforced by an earthquake resistant
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8
Do not clamp the refrigerant pipe tightly when supporting
them for prevention of heat stress.
9
When connecting indoor/outdoor units with refrigerant pipes,
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weak portions of the wall, ceiling, etc. Failure to take this
measure may lead to an abnormal sound caused by the
vibration of the pipe.
10
Perform the air tight test according to the technical
documentation of the outdoor unit.
11
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insulations to prevent dew condensation. Then insulate each
refrigerant pipe as well.
12
When the thickness of insulation for gas piping is 20mm,
attach the insulation moving to the indoor unit side as shown
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gap between the insulation and local piping insulation.
Unit
side
Check no clearance between the
indoor unit and the insulation
Insulation material
(factory-supplied)
Insulation for refrigerant
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Refrigerant pipe
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)L[WKHYLQ\OWDSHSRVLWLRQDWWKHYHUWLFDOSDUW
(insulation for refrigerant pipe (accessory))
Fasten 3 places of the pipe
by cord clamps (accessory)
Fasten securely cord clamps and the vinyl tape in order to prevent the pipe
from dew condensation
REFRIGERANT PIPING WORK
PMML0416A rev.0 - 12/2015 - P5415720
22
