6. SYSTEM DESIGN
Limitation check
Diagram
Example
m
Limitation
m
Judge
Total pipe length Total 89 115 or less
OK
Between outdoor unit and the farthest indoor unit a + b + c + l 55 70 or less
OK
Between outdoor unit and branch boxes a + b + c + d + e 53 55 or less
OK
Between branch box and indoor unit
Tot al f + i + l 36 60 or less
OK
Each unit f, i, l 12 Between 3 to 15
OK
etween outdoor unit and the rst separation tube a 7 5 or more
OK
Calculation of additional charge refrigerant
Liquid pipe size
mm (in.)
6.35
(1/4)
9.52
(3/8)
Additional refrigerant
g/m
21 58
Liquid pipe length
m
36 53
Additional charge = (21 x 36) + (58 x 53) = 3830 g = 3.83 kg
- (06 - 26) -
SYSTEM
DESIGN
SYSTEM
DESIGN
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