Refrigerant Piping Design - BGH BV-V28W/DHN1 Manual

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.
3.3 Connection Method
Various piping patterns can be selected, such as out from the front, the back the side, and undersurface, etc. (The follow
display the locations of several piping and wiring knock-off interfaces)
Table 3-3.2: The indoor and outdoor connecting pipe interface
Front out pipe
Undersurface out pipe
Table 3-3.1: Piping temper and thickness
Piping outer diameter
(mm)
Ф6.35
Ф9.53
Ф12.7
Ф15.9
Ф19.1
Ф22.2
Ф25.4
Ф28.6
Ф31.8
Ф38.1
Ф41.3
Ф44.5
Ф54.0
Notes:
1. O: coiled piping;
2. 1/2H: straight piping.
Fat pipe
For the 48kBtu/h outdoor unit's back out pipe connection, connecting pipe
is suggestted to be used. For the 56kBtu/h outdoor unit's, connecting pipe is
suggestted to be used in all directions out pipe connection
Minimum thickness
Temper
1
(mm)
0.8
0.8
O
0.8
(annealed)
1.0
1.0
1.2
1.2
1.3
1/2H 1.5
(half hard)
1.5
1.5
1.5
1.8
Side out pipe
The connect methond of aring
Connecting Pipe
(Accessorry)
Front out
pipe
Bottom out
pipe
Back out pipe
Back out
pipe
Side out
pipe
75