Fujitsu AIRSTAGE J-IIIL Design & Technical Manual page 556

• Selection of pipe size
Pipe no.
a
b
b1
c
d
e1
e2
f1
f2
f3
• 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
in (mm)
Ø1/2 (12.70)
Ø3/8 (9.52)
Ø1/4 (6.35)
A = (0.077 lb × 311 ft) + (0.039 lb × 104 ft) + (0.014 lb × 82 ft) = 29.151 (lb)
A = (0.114 kg × 95 m) + (0.058 kg × 32 m) + (0.021 kg × 25 m) = 13.211 (kg)
– Calculation of factory charge amount (B)
Outdoor unit
B = 24.25 lb (11.0 kg)
– Total refrigerant amount check (C)
C = A + B = 29.151 + 24.25 = 53.402 (lb) < 56.44 (lb) → OK
C = A + B = 13.211 + 11.0 = 24.211 (kg) < 25.6 (kg) → OK
Check pipe length and height difference between the units by comparing with
page 06-17.
2-6. Piping design example
Liquid pipe
Ø1/2 (12.70)
Ø1/2 (12.70)
Ø3/8 (9.52)
Ø3/8 (9.52)
Ø3/8 (9.52)
Ø3/8 (9.52)
Ø1/4 (6.35)
Ø1/4 (6.35)
Ø1/4 (6.35)
Ø1/4 (6.35)
Pipe
Additional amount for pipe
1
Pipe diameter: in (mm)
Gas pipe
Ø1-1/8 (28.58)
Ø7/8 (22.22)
Ø5/8 (15.88)
Ø5/8 (15.88)
Ø3/4 (19.05)
Ø5/8 (15.88)
Ø1/2 (12.70)
Ø3/8 (9.52)
Ø3/8 (9.52)
Ø3/8 (9.52)
Example
Diagram
Total 498 (152)
a + b + c + f3 364 (111)
b + c + f3 118 (36)
a + b1 269 (82)
a 246 (75)
length
lb/ft (kg/m)
0.077 (0.114)
0.039 (0.058)
0.014 (0.021)
Model name
AOU120RLAVL
- (06-34) -
Length example
ft (m)
246 (75)
65 (20)
22 (7)
32 (10)
26 (8)
22 (7)
22 (7)
19 (6)
19 (6)
19 (6)
Limitation
Judge
ft (m)
1,312 (400)
OK
or less
393 (120)
OK
or less
295 (90)
OK
or less
17 (5)
OK
or more
10 (3)
OK
or more
Liquid pipe length
ft (m)
311 (95)
104 (32)
82 (25)
Factory charge amount
24.25 lb (11.0 kg)
"Piping limitation"
2. Piping design
on