Size Of Pipes (Ø Mm) - Hitachi RAS-8FSXNS2E Installation & Operation Manual

• The copper pipe for refrigeration installations is especially treated for outdoors and indoors. The
interior surface finish makes it easier for the refrigerant to circulate and withstands the action of
the lubricant oil applied to outdoor equipment.
Always use clean copper pipes with no signs of knocks or cracks. Make sure there is no dust or
dampness on the inside. Before you install the pipes, clean the inside with oxygen-free nitrogen
gas to eliminate any remains of dust or other substances.
!
CAUTION
• Do not use hand saws, circular saws, abrasive grinders or other tools that generate shavings.
• 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).
On completing the installation of the refrigerant pipes, insulate them appropriately using suitable
insulating material and seal the open space between the holes made and the pipe.
3.2.1 Size of pipes (Ø mm)
◆ For heat pump systems (2 pipe)
For selecting the pipe sizes between the outdoor unit and the piping connection kit 1, between the
piping connection kit 2 and for piping connection kit Ⓐ, refer to the print version of the manual.
Combination of 2 and 3 units
Piping Connection
Kit 1
A
L: Keep the straight line distance of 500mm or more after the piping connection kit.
PMML0628 rev.0 - 05/2023
Outdoor
Unit
A
L
La
1
2
Piping Connection
Kit 2
Outdoor
Unit
B
Lb
1
L
A
Upstream Side
Outdoor
Unit
C
Lc
1
14
3