Refrigerant Piping Design - Midea V6R Series Manual

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.
Table 3-4.1: Piping temper and thickness
Piping outer
diameter Temper
(mm)
Ф6.35
Ф9.53
Ф12.7
(annealed)
Ф15.9
Ф19.1
Ф22.2
Ф25.4
Ф28.6
Ф31.8 1/2H
(half hard)
Ф38.1
Ф41.3
Ф44.5
Ф54.0
Notes:
1. O: coiled piping; 1/2H: straight piping.
Minimum thickness
1
(mm)
0.8
0.8
O
0.8
1.0
1.0
1.2
1.2
1.3
1.5
1.5
1.5
1.5
1.8
V6R VRF 50/60Hz
135