Part 3 - S
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em Design and Ins
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Amazon Unitario Top Discharge
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3.5 Snow Shielding
In areas of high snowfall, snow shields should be installed on air inlets and outlets to prevent snow from entering the
units. Additionally, the height of the base structures should be increased so as to raise the units further off the ground.
Figure 3-3.14: Outdoor unit snow shielding
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 (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
Ф34.9
1.5
Ф41.3
1.5
Ф54.0
1.8
Notes:
1. O: coiled piping; 1/2H: straight piping.
Snow shield for air inlet
Snow shield for air outlet
Snow shield for air inlet
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