13.2 PIPING CONNECTION
1
Flaring Work
Perform flaring work according to the figure and tables
below.
• Flare Pipe Dimensions
mm (in.)
0.4 ~ 0.8R
φ
A
φ
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
Use the accessory flare nut specified by JIS 8607.
3
Check that there are no scratches, adhered grinding swarf,
deformation or surface unevenness at the flaring part.
4
Before tightening the flare nut, apply the refrigerant oil (field-
supplied) in thin layer over the flaring part. Do not apply the
oil on other portions. Tighten the flare nut for the liquid pipe
to the specified torque with two spanners. Then, tighten the
flare nut for the gas pipe in the same way. After tightening
work, check that there is no refrigerant leakage.
?
N O T E
Refrigerant oil is field-supplied.[ Ethereal Oil FVC50K, FVC68D
(Idemitsu Kousan Co. Ltd.) ]
Do not apply the
refrigerant oil to the
outside of the flaring
part
Apply refrigerant oil
Required tightening torque
(JIS B8607)
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
If the refrigerant oil contacts the air panel, it may cause a crack. Be
careful that the refrigerant oil does not contact the air panel.
!
C A U T I O N
Tighten the flare nuts according to the specified torque. If an
excessive force is applied, the flare nuts may crack due to aging
degradation, causing refrigerant leakage.
5
If temperature and humidity inside the ceiling exceed 27ºC/
RH80%, dew condensation occurs on the surface of the
accessory insulation. Wrap additional insulation (approx 5
~ 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
support so that they will not be damaged by an external force.
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,
fix the pipes as required so that the pipes may not to contact
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
Insulate each flare connection without gap with accessory
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
in the figure. When attaching, wrap the insulation without
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
pipe (field-supplied)
Refrigerant pipe
(field-supplied)
Fix the vinyl tape position at the vertical part
(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
PMML0549 rev.1 - 02/2021 - A10761230A
22
Содержание RCD-2.0FSR
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