Fujitsu AJ 126LELDH Series - Page 744

• Selection of pipe size
Pipe no.
Pipe diameter (mm)
Length example
(m)
Liquid pipe Gas pipe
a Ø9.52 Ø19.05 40
a1 Ø6.35 Ø12.70 15
b Ø12.70 Ø22.22 5
b1 Ø6.35 Ø12.70 10
c Ø12.70 Ø22.22 5
c1 Ø6.35 Ø12.70 10
d Ø12.70 Ø19.05 5
d1 Ø6.35 Ø12.70 10
e Ø9.52 Ø19.05 5
e1 Ø6.35 Ø12.70 10
f Ø9.52 Ø15.88 5
f1 Ø6.35 Ø12.70 10
g Ø9.52 Ø15.88 5
g1 Ø6.35 Ø12.70 10
h Ø6.35 Ø9.52 7
• Limitation check
Pipe Diagram
Example Limitation
Judge
m
Total pipe length Total 152
400
or less
OK
Between outdoor unit and farthest indoor
unit
a + b + c + d + e + f
+ g + h
77
120
or less
OK
Between the first separation tube and the
farthest indoor unit
b + c + d + e + f + g
+ h
37
90
or less
OK
Between outdoor unit and the nearest
indoor unit
a + a1 55
5
or more
OK
Between outdoor unit and the first
separation tube
a 40
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 15
Ø9.52 0.058 55
Ø6.35 0.021 82
A = (0.114 kg × 15 m) + (0.058 kg × 55 m) + (0.021 kg × 82 m) = 6.62 (kg)
– Calculation of factory charge amount (B)
Outdoor unit Model name Factory charge amount (kg)
1
AJ072LELDH
7.0
B = 7.0 (kg)
– Total refrigerant amount check (C)
C = A + B = 6.62 + 7.0 = 13.62 (kg) < 20 (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
- (06-30) - 2. Piping design
SYSTEM DESIGN SYSTEM DESIGN