Piping Work Connection Considerations; Copper Pipes And Sizes - Hitachi RASC-4HNPE Service Manual

3 Piping work and refrigerant charge

Piping work connection considerations

3.1 Piping work connection considerations

3.1.1 Copper pipes and sizes

1 Prepare locally-supplied copper pipes.
2 Select the correct pipe size and material. Use the table below to select the required piping.
Nominal Diameter
(mm)
Ø6.35
Ø9.52
Ø12.7
Ø15.88
Ø19.05
Ø22.23
Ø25.4
Ø28.58
3 Select clean copper pipes. Make sure there is no dust and moisture inside. Blow the inside of the pipes through with
oxygen-free nitrogen to remove any dust and foreign materials before connecting pipes.
4 After connecting the refrigerant piping, seal the open space between the knockout hole and refrigerant pipes by using
insulation material as shown below:
?
N O T E
If copper pipe is used for piping bigger than Ø19.05 flaring work can not be performed. If necessary, use a joint adapter.
!
C A U T I O N
• Do not use saws, grindstone or other tools which might create copper dust.
• When cutting pipes, secure the part to be soldered as shown in the Service Manual.
• Strictly follow national or local regulations regarding occupational health and safety.
• Wear appropriate means of protection during cutting or brazing operations and installation (gloves, eye protection, etc).
30 SMGB0091 rev.2 - 11/2015
Thickness
(in)
1/4
3/8
1/2
5/8
3/4
7/8
1
11/8
Insulation
Field-supplied
refrigeration piping
Insulation
Insulation
Copper Type
(mm)
0.80
0.80
0.80 Pipe/Roll
1.00
1.00 Pipe/Roll
1.00 Pipe/Roll
1.00
1.25
Roll
Roll
Roll
Pipe
Coil