4 Refrigerant Piping Design
4.1 Design Considerations
Refrigerant piping design should take account of the following considerations:
The amount of brazing required should be kept to a minimum.
On the two inside sides of the first indoor branch joint (“A” in Figures 3-4.2, 3-4.3 and 3-4.4) the system should, as far
as possible, be equal in terms of number of units, total capacities and total piping lengths.
4.2 Material Specification
Only seamless phosphorus-deoxidized copper piping that complies with all applicable legislation should be used. Temper
grades and minimum thicknesses for different diameters of piping are specified in Table 3-4.1.
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