Fujitsu AUYG07LVLA Design & Technical Manual page 268

Selection of pipe size
a
Liquid pipe size 9.52
mm (in.) (3/8)
Gas pipe size 15.88
mm (in.) (5/8)
Pipe length
7
m
h
Liquid pipe size 6.35
mm (in.) (1/4)
Gas pipe size 9.52
mm (in.) (3/8)
Pipe length
5
m
Limitation check
Total pipe length
Between outdoor unit and the farthest indoor unit
Between outdoor unit and branch boxes
Between branch box and indoor unit
etween outdoor unit and the first separation tube
Calculation of additional charge refrigerant
Liquid pipe size
mm (in.)
Additional refrigerant
g/m
Liquid pipe length
m
Additional charge = (21 x 43) + (58 x 37) = 3049 g = 3.05 kg
b c d
9.52 9.52 9.52
(3/8) (3/8) (3/8)
15.88 15.88 15.88
(5/8) (5/8) (5/8)
10 10 5
i j k
6.35 6.35 6.35
(1/4) (1/4) (1/4)
9.52 9.52 9.52
(3/8) (3/8) (3/8)
5 5 5
Diagram
a + b + c + m
a + b + c + d + e
Total f + g + h + i + j + k + l + m
Each unit f, g, h, i, j, k, l, m
6.35 9.52
(1/4) (3/8)
21 58
43 37
- (06 - 20) -
e f g
9.52 6.35 6.35
(3/8) (1/4) (1/4)
15.88 9.52 9.52
(5/8) (3/8) (3/8)
5 5 5
l m
6.35 6.35
(1/4) (1/4)
9.52 9.52
(3/8) (3/8)
5 8
Example
m
Total 80
35
37
43
5 to 8
a 7
Limitation
Judge
m
115 or less
OK
70 or less
OK
55 or less
OK
60 or less
OK
Between 3 to 15
OK
5 or more
OK
6. SYSTEM DESIGN