Hitachi RCIM-1.5FSN4 - Flare Pipe Dimensions and Tightening Torque

ENGLISH
14.3 PIPING CONNECTION SIZE
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mm (in.)
0.4 ~ 0.8R
IA
Id
90
o
+
2
o
45
o
+
2
o
Diameter ( 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
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mm (in.)
Diameter ( d)
Thickness
6.35 (1/4) 0.8
9.52 (3/8) 0.8
12.7 (1/2) 0.8
15.88 (5/8) 1.0
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mm (in.)
B
Flare Nut
Flare nut
Diameter ( d)
B
6.35 (1/4) 17
9.52 (3/8) 22
12.7 (1/2) 26
15.88 (5/8) 29
Check that there are no scratches, adhered grinding swarf,
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for the gas pipe in the same way. After tightening work, check
that there is no refrigerant leakage.
Do not apply the
refrigerant oil to
the outside of the
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Apply refrigerant oil
Required tightening torque
Pipe Size Tightening Torque
Ø6.35 mm (1/4) 14 - 18 (N-m)
Ø9.52 mm (3/8) 34 - 42 (N-m)
Ø12.7 mm (1/2) 49 - 61 (N-m)
Ø15.88 mm (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~ 10mm thickness) around the accessory insulation of the
refrigerant pipe as a preventive measure.
For buried pipe with joints such as an elbow or a socket, provide
service access doors to facilitate the check for connection.
The pipes must be reinforced by an earthquake resistant
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Do not clamp the refrigerant pipe tightly when supporting them
for prevention of heat stress.
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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.
Perform the air tight test according to Installation and Operation
Manual of the outdoor unit.
Refrigerant piping
PMML0363A rev.2 - 08/2016 - P541655923