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PMEN0654 rev.0 - 12/2023
5
SELECTIONOFTHECOPPERPIPES
REFRIGERANT PIPING AND REFRIGERANT CHARGE
5.1 Selecon of the copper pipes
The copper pipe used for the installaon must be specic for refrigeraon systems.
! CAUTION
• The copper pipe used in the refrigeraon installaons is dierent to the copper pipe used in
installaons carrying domesc or heang water.
• The copper pipe for refrigeraon installaons is especially treated for outdoors and indoors. The
interior surface nish makes it easier for the refrigerant to circulate and withstands the acon of
the lubricant oil used in outdoor units.
Select the pipe with the appropriate diameter and thickness. Use the table below to select the
most appropriate pipe:
Nominal diameter
Thickness (mm) Supply
Ø6.35 1/4 0.80 Coil
Ø9.52 3/8 0.80 Coil
Ø12.7 1/2 0.80 Coil
Ø15.88 5/8 1.00 Coil
Ø19.05 3/4 1.00 Straight lengths
Ø22.2 7/8 1.00 Straight lengths
Ø25.4 1 1.00 Straight lengths
Ø28.58 1-1/8 1.00 Straight lengths
Ø31.75 1-1/4 1.10 Straight lengths
Ø38.1 1-1/2 1.35 Straight lengths
Ø41.3 1-5/8 1.45 Straight lengths
Ø44.45 1-3/4 1.55 Straight lengths
Ø50.8 2 1.78 Straight lengths
Always use clean copper pipes with no signs of knocks or cracks. Make sure there is no dust or
dampness on the inside. A system with no moisture or oil contaminaon will give maximum
performance and life cycle compared to that of a poorly prepared system.
5.2 Three principles on work with refrigerant pipes
The basic refrigerant pipe installaon work must be carried out paying parcular aenon to avoid
the inltraon of humidity or dust while working with the refrigerant piping. Otherwise, rust may
appear inside the system or the units and cause serious faults.
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