Fujitsu AIRSTAGE V-II, Design & Technical Data

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Selection of pipe size
„ z
a b c d e f * f1 g h1 h2
Liquid pipe 12.70 12.70 12.70 15.88 19.05 19.05 9.52 12.70 9.52 12.70
Gas pipe 28.58 28.58 22.22 28.58 34.92 34.92 19.05 28.58 19.05 22.22
Length (m)
Example
2 2 2 2 40 10 10 5 5 10
i j1 k1 l1 m1 n1
Liquid pipe 15.88 9.52 9.52 9.52 9.52 9.52
Gas pipe 28.58 19.05 19.05 19.05 19.05 19.05
Length (m)
Example
20 10 5 10 5 10
Pipe size "f" selection : Even though this pipe size might be selected based on downstream *
cooling capacity (95.9kW) 19.05 / 41.27, This pipe size should not be larger than pipe size "e".
Therefore select pipe size equal to pipe size "e" (19.05 / 34.92).
Calculation of additional charge refrigerant
„ z
66 Calculation of additional amount for outdoor unit
Model
Additional amount for
outdoor unit (kg)
Outdoor unit1 AJ

126 3.30
Outdoor unit2 AJ

108 1.20
Outdoor unit3 AJ

A72 0
A = 3630 + 6620 + 0 = 4650 (kg)
26 Calculation of additional amount for pipe length
Liquid pipe size 19.05 15.88 12.70 9.52 6.35
Additional refrigerant
(kg/m)
0.268 0.178 0.114 0.058 0.021
Liquid pipe length (m) 50 22 21 55 0
B = (06268 x 50) + (06678 x 22) + (06664 x 26) + (06058 x 55) = 22690 kg
36 Calculation of additional charge refrigerant
C = A + B = 4650 + 22690 = 27640 (kg)
46 Calculation of factory charged amount
Model
Factory charged
amount (kg)
Outdoor unit1 AJ

126 11.80
Outdoor unit2 AJ

108 11.80
Outdoor unit3 AJ

A72 11.20
D = 66680 + 66680 + 66620 = 34680 (kg)
56 Total refrigerant amount check
E = C + D = 27.40 + 34.80 = 62.20 (kg) < 94.5 (kg) → OK
Check pipe length and height difference between units by comparing with items shown in "6-2-2.
LIMITATION".
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