Copper Pipes, Measurements And Connection; Copper Pipes And Measurements - Hitachi RWM-(H)FSN3E Technical Catalogue

9 Piping work and
refrigerant charge

9.2 Copper pipes, measurements and connection

9.2.1 Copper pipes and measurements

C A U T I O N
• The copper pipe used in the refrigeration installations is different to the copper pipe used in installations ca-
rrying domestic or heating water.
• The copper pipe for refrigeration installations is especially treated for outdoors and indoors. The interior sur-
face finish makes it easier for the refrigerant to circulate and withstands the action of the lubricant oil used in
outdoor units.
Prepare the copper pipes provided by the supplier.
Select the pipe with the appropriate diameter and thickness. Use the table below to select the most appropriate pipe:
Nominal diameter
mm
Ø6.35
Ø9.53
Ø12.70
Ø15.88
Ø25.40
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 subs-
tances.
C A U T I O N
• 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 pro-
tection, etc).
On completing the installation of the refrigerant pipes -B-,
insulate them appropriately using suitable insulating mate-
rial -A- and seal the open space between the holes made
and the pipe, as shown in the figure.
113
TCGB0070 rev.3 - 04/2012
Thickness mm
Inches
1/4
3/8
1/2
5/8
1
0.80
0.80
0.80 Pipe/Roll
1.00
1.00
Supply
Roll
Roll
Roll
Roll
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