Fujitsu AIRSTAGE J-II Design & Technical Manual page 468

Selection of pipe size
z „
*a
Liquid pipe 9.52
Gas pipe 19.05 19.05
Length (m)
60
Example
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 „
Total pipe length
Between outdoor unit and farthest indoor unit
Between the first separation tube and the farthest indoor unit
Between outdoor unit and the nearest indoor unit
Between outdoor unit and the first seperation tube
Calculation of additional charge refrigerant
z „
1. Calculation of additional amount for pipe length
Liquid pipe size
Additional refrigerant
(kg/m)
Liquid pipe length (m)
A = (0.058 x 95) + (0.021 x 50) = 6.56 (kg)
2. Factory charged amount
Outdoor unit
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".
b b1 c
9.52 6.35 9.52
12.70 15.88
15 10 15
9.52 6.35
0.058 0.021
95 50
Factory charged
Model
amount (kg)
AJ  A45 5.30
d e1 e2
9.52 6.35 6.35
15.88 12.70 12.70
5 10 5
Diagram
Total
a+b+c+f3
b+c+f3
a+b1
a
- (06 - 26) -
f1 f2 f3
6.35 6.35 6.35
12.70 12.70 12.70
10 5 10
Example Limitation
Judge
(m) (m)
145 180m or less OK
100 120m or less OK
40 40m or less OK
70 5m or more OK
60 3m or more OK