Fujitsu Airstage J-II Series Design & Technical Manual page 587

z Selection of pipe size
„
a
Liquid pipe
3/8"
1/4" (6.35)
(9.52)
in. (m)
Gas pipe
3/4"
(19.05) (12.70)
in. (m)
Length ft. (m)
131 (40) 49 (15)
Example
f
Liquid pipe
3/8"
1/4" (6.35)
(9.52)
in. (m)
Gas pipe
5/8"
(15.88) (12.70)
in. (m)
Length ft. (m)
16 (5) 32 (10)
Example
z Limitation check
„
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 separation tube
z Calculation of additional charge refrigerant
„
1. Calculation of additional amount for pipe length
Liquid pipe size
in. (m)
Additional refrigerant
lbs./ft. (kg/m)
Liquid pipe length
ft. (m)
A = (0.039 x 230) + (0.014 x 270) = 12.75 (lbs.)
[(0.058 x 70) + (0.021 x 82) = 5.79 (kg)]
2. Factory charged amount
Outdoor unit
B = 11.7 (lbs.)
[5.30 (kg)]
3. Total refrigerant amount check
C = A + B = 12.75 + 11.7 = 24.45(lbs.) < 34.61 (lbs.) → OK
[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".
a1 b b1
3/8"
1/4" (6.35)
(9.52)
1/2" 3/4" 1/2"
(19.05) (12.70)
16 (5) 32 (10)
f1 g g1
3/8"
1/4" (6.35) 1/4" (6.35)
(9.52)
1/2" 5/8" 1/2"
(15.88) (12.70)
16 (5) 32 (10)
3/8" 1/4"
(9.52) (6.35)
0.039 0.014
(0.058) (0.021)
230 (70) 270 (82)
Factory charged
Model
amount lbs. (kg)
AOU60 11.7 (5.30)
c c1 d
3/8" 3/8"
1/4" (6.35)
(9.52) (9.52)
3/4" 1/2" 5/8"
(19.05) (12.70) (15.88)
16 (5) 32 (10) 16 (5)
h
1/2"
(12.70)
22 (7)
Diagram
Total
a+b+c+d+e+f+g+h
b+c+d+e+f+g+h
a+a1
a
- (06 - 23) -
d1 e
3/8"
1/4" (6.35) 1/4" (6.35)
(9.52)
1/2" 5/8"
(12.70) (15.88)
32 (10) 16 (5)
Example Limitation
ft. (m) ft. (m)
498 (152) 590 (180) or less
252 (77) 393 (120) or less
121 (37) 131 (40) or less
180 (55) 16 (5) or more
131 (40) 9 (3) or more
e1
1/2"
(12.70)
32 (10)
Judge
OK
OK
OK
OK
OK