Hitachi RAM-10MQ, Installation & Maintenance Manual

Page: 5 / 32

5
+0
-0.4
Weight Scale
○ ○
Measuring Instrument for
Refrigerant Charging
Refrigerant Gas
Leakage Detector
※● □
‧
The current gas leakage detector(R22) is not
applicable due to different detecting method.
Gas Leakage Check
(3) The piping and connection parts use the following R410A. Flare nut and the front of pipe flare size also changes as shown
in the table below.
Unit
：
mm
●
Pipe thickness selected
Unit
：
mm
Diameter
R410A
Thickness Material
¯
6.35 0.8 O
¯
9.53 0.8 O
¯
12.7 0.8 O
¯
15.88 1.0 O
¯
19.05 1.0 1/2H
¯
22.2 1.0 1/2H
¯
25.4 1.0 1/2H
¯
28.6 1.0 1/2H
¯
31.75 1.1 1/2H
¯
38.1 1.35 1/2H
¯
41.3 1.20 1/2H
¯
44.45 1.55 1/2H
●
Selection of joints
With the design pressure changes, the connection pipe (elbow etc.) thickness are also changes. When using 1/2H
material, the bending and flaring can not be processed, so please follow the table below to choose the minimum
thickness that appropriate to the connecting pipe. Please note that there are several changes in flare nut size.
Connection minimum thickness (mm)
Diameter R410A Diameter R410A
¯
6.35 0.5
¯
25.4 0.95
¯
9.53 0.6
¯
28.6 1.0
¯
12.7 0.7
¯
31.75 1.1
¯
15.88 0.8
¯
38.1 1.35
¯
19.05 0.8
¯
41.3 1.45
¯
22.2 0.9
¯
44.45 1.55
Flare Nut dimension B (mm)
Diameter
Flare Nut dimension B(mm)
Diameter
Flare Nut dimension B(mm)
R410A R410A
¯
6.35 17
¯
15.88 29
¯
9.53 22
¯
19.05 36
¯
12.7 26
Diameter
¯
d
Dimension
¯
A
R410A
¯
6.35
¯
9.1
¯
9.53
¯
13.2
¯
12.7
¯
16.6
¯
15.88
¯
19.7
¯
19.05
※
Can not be processed
(1/2H material)
Flare Nut
Pipe Flare Size