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Mini Amazon III Series
102
3 Refrigerant Piping Design
3.1 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 3-3.4 and Figure 3-3.5) the system should, as far
as possible, be equal in terms of number of units, total capacities and total piping lengths.
3.2 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 3-3.1.
Table 3-3.1: Piping temper and thickness
Piping outer diameter
(mm)
Temper
1
Minimum thickness
(mm)
Ф6 .35
O
(annealed)
0.8
Ф9 .53 0.8
Ф12 .7 0.8
Ф15 .9 1.0
Ф19 .1 1.0
Ф22 .2
1/2H
(half hard)
1.2
Ф25 .4 1.2
Ф28 .6 1.3
Ф 31.8 1.5
Ф38 .1 1.5
Ф 41.3 1.5
Ф44 .5 1.5
Ф54 .0 1.8
Notes:
1. O: coiled piping;
2. 1/2H: straight piping.
3.3 The Permitted Piping Lengths and Level Differences
The piping length and level difference requirements that apply are summarized in Table 3-3.2 and are fully described as
follows (refer to Figure 3-3.1 and Figure 3-3.2):
Figure 3-3.1: The first connecting method