Fujitsu AJ 126LELDH Series Design & Technical Manual page 744

• Selection of pipe size
Pipe no.
a
a1
b
b1
c
c1
d
d1
e
e1
f
f1
g
g1
h
• 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
• Calculation of additional charge refrigerant
– Calculation of additional amount for pipe length (A)
Diameter of liquid pipe (mm)
Ø12.70
Ø9.52
Ø6.35
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
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
page 06-17.
2-6. Piping design example
Liquid pipe
Ø9.52
Ø6.35
Ø12.70
Ø6.35
Ø12.70
Ø6.35
Ø12.70
Ø6.35
Ø9.52
Ø6.35
Ø9.52
Ø6.35
Ø9.52
Ø6.35
Ø6.35
Pipe
a + b + c + d + e + f
b + c + d + e + f + g
Additional amount for pipe
1
Pipe diameter (mm)
Gas pipe
Ø19.05
Ø12.70
Ø22.22
Ø12.70
Ø22.22
Ø12.70
Ø19.05
Ø12.70
Ø19.05
Ø12.70
Ø15.88
Ø12.70
Ø15.88
Ø12.70
Ø9.52
Example
Diagram
Total 152
77
+ g + h
37
+ h
a + a1 55
a 40
length (kg/m)
0.114
0.058
0.021
Model name
AJ072LELDH
- (06-30) -
Length example
(m)
40
15
5
10
5
10
5
10
5
10
5
10
5
10
7
Limitation
Judge
m
400
OK
or less
120
OK
or less
90
OK
or less
5
OK
or more
3
OK
or more
Liquid pipe length (m)
15
55
82
Factory charge amount (kg)
7.0
"Piping limitation"
2. Piping design
on