Fujitsu Airstage J-II - Page 468

Selection of pipe size
z
*a b b1 c d e1 e2 f1 f2 f3
Liquid pipe 9.52 9.52 6.35 9.52 9.52 6.35 6.35 6.35 6.35 6.35
Gas pipe 19.05 19.05 12.70 15.88 15.88 12.70 12.70 12.70 12.70 12.70
Length (m)
Example
60 15 10 15 5 10 5 10 5 10
Pipe size "a" selection : The length that between outdoor unit and the farthest indoor unit.

a + b + c + f3 =100 > 90m
Therefore Gas pipe must be size up from 15.88mm to 19.05mm. (Refer 2-3. PIPE SIZE)
Limitation check
z
Diagram
Example
(m)
Limitation
(m)
Judge
Total pipe length Total 145 180m or less OK
Between outdoor unit and farthest indoor unit a+b+c+f3 100 120m or less OK
Between the rst separation tube and the farthest indoor unit b+c+f3 40 40m or less OK
Between outdoor unit and the nearest indoor unit a+b1 70 5m or more OK
Between outdoor unit and the rst seperation tube a 60 3m or more OK
Calculation of additional charge refrigerant
z
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) 95 50
A = (0.058 x 95) + (0.021 x 50) = 6.56 (kg)
2. Factory charged amount
Model
Factory charged
amount (kg)
Outdoor unit AJ

A45 5.30
B = 5.30 (kg)
3. Total refrigerant amount check
C = A + B = 6.56 + 5.30 = 11.86 (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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