Hitachi RCD-0.8FSN3 Installation And Operation Manual page 30

REFRIGERANT PIPING WORK
15.2 PIPING CONNECTION
1 Flaring Work
below.
• Flare Pipe Dimensions
mm (in.)
Ø
A
Diameter d
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
Ø
Diameter d
6.35
9.52
12.7
15.88
• Flare Nut Dimensions
Ø
Diameter d
6.35
9.52
12.7
15.88
2
3 Check that there are no scratches, adhered grinding swarf,
4
work, check that there is no refrigerant leakage.
N O T E
Apply refrigerant oil
Do not apply the
refrigerant oil to the
part
22 PMML0416A rev.0 - 12/2015 - P5415720
+ 2
90 o o
+0
-0.4
A
0.4 ~ 0.8R
d
(mm)
Thickness
0.8
0.8
0.8
1.0
B
(mm)
B
17
22
26
Flare nut
29
Required tightening torque
Pipe size
Ø6.35 (1/4)
Ø9.52 (3/8)
Ø12.7 (1/2)
Ø15.88 (5/8)
N O T E
C A U T I O N
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
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,
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
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
gap between the insulation and local piping insulation.
Fasten securely cord clamps and the vinyl tape in order to prevent the pipe
from dew condensation
Fasten 3 places of the pipe
by cord clamps (accessory)
Unit
side
Insulation material
(factory-supplied)
Check no clearance between the
indoor unit and the insulation
Tightening torque
14 - 18 (N-m)
34 - 42 (N-m)
49 - 61 (N-m)
68 - 82 (N-m)
(insulation for refrigerant pipe (accessory))
Refrigerant pipe
Insulation for refrigerant