Fujitsu AJ 126LELDH Series - Page 746

• Selection of pipe size
Pipe no.
Pipe diameter (mm)
Length example
(m)
Liquid pipe Gas pipe
a Ø12.70 Ø22.22 75*
b Ø12.70 Ø22.22 5
b1 Ø9.52 Ø15.88 10
c Ø9.52 Ø15.88 5
d Ø9.52 Ø15.88 5
e1 Ø6.35 Ø12.70 10
e2 Ø6.35 Ø12.70 5
f1 Ø6.35 Ø9.52 5
f2 Ø6.35 Ø9.52 5
f3 Ø6.35 Ø9.52 5
*: When the length of the pipe between outdoor unit and the first separation tube or header is
greater than 70 m, liquid pipe must be size up from 9.52 mm to 12.70 mm.
For details, refer to "Pipe size selection" on page 06-22.
• Limitation check
Pipe Diagram
Example Limitation
Judge
m
Total pipe length Total 155
400
or less
OK
Between outdoor unit and farthest indoor
unit
a + b + c + f3 110
120
or less
OK
Between the first separation tube and the
farthest indoor unit
b + c + f3 30
90
or less
OK
Between outdoor unit and the nearest
indoor unit
a + b1 90
5
or more
OK
Between outdoor unit and the first
separation tube
a 75
3
or more
OK
• Calculation of additional charge refrigerant
– Calculation of additional amount for pipe length (A)
Diameter of liquid pipe (mm)
Additional amount for pipe
length (kg/m)
Liquid pipe length (m)
Ø12.70 0.114 80
Ø9.52 0.058 20
Ø6.35 0.021 30
A = (0.114 kg × 80 m) + (0.058 kg × 20 m) + (0.021 kg × 30 m) = 10.91 (kg)
– Calculation of factory charge amount (B)
Outdoor unit Model name Factory charge amount (kg)
1
AJ090LELDH
7.5
B = 7.5 kg
– Total refrigerant amount check (C)
C = A + B = 10.91 + 7.5 = 18.41 (kg) < 20.0 (kg) → OK
Check pipe length and height difference between the units by comparing with "Piping limitation" on
page 06-17.
2-6. Piping design example
- (06-32) - 2. Piping design
SYSTEM DESIGN SYSTEM DESIGN