Fujitsu Airstage J-II - Page 466

Selection of pipe size
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a a1 b b1 c c1 d d1 e e1
Liquid pipe 9.52 6.35 9.52 6.35 9.52 6.35 9.52 6.35 9.52 6.35
Gas pipe 19.05 12.70 19.05 12.70 19.05 12.70 15.88 12.70 15.88 12.70
Length (m)
Example
40 15 5 10 5 10 5 10 5 10
f f1 g g1 h
Liquid pipe 9.52 6.35 9.52 6.35 6.35
Gas pipe 15.88 12.70 15.88 12.70 12.70
Length (m)
Example
5 10 5 10 7
Limitation check
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Diagram
Example
(m)
Limitation
(m)
Judge
Total pipe length Total 152 180m or less OK
Between outdoor unit and farthest indoor unit a+b+c+d+e+f+g+h 77 120m or less OK
Between the rst separation tube and the farthest indoor unit b+c+d+e+f+g+h 37 40m or less OK
Between outdoor unit and the nearest indoor unit a+a1 55 5m or more OK
Between outdoor unit and the rst seperation tube a 40 3m or more OK
Calculation of additional charge refrigerant
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1. Calculation of additional amount for pipe length
Liquid pipe size 9.52 6.35
Additional refrigerant
(kg/m)
0.058 0.021
Liquid pipe length (m) 70 82
A = (0.058 x 70) + (0.021 x 82) = 5.79 (kg)
2. Factory charged amount
Model
Factory charged
amount (kg)
Outdoor unit AJ

A54 5.30
B = 5.30 (kg)
3. Total refrigerant amount check
C = A + B = 5.79 + 5.30 = 11.09(kg) < 15.70 (kg) → OK
Check pipe length and height difference between units by comparing with items shown in "2-2.PIPING
LIMITATION".
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