Fujitsu AIRSTAGE J-IIIL - Page 556

• Selection of pipe size
Pipe no.
Pipe diameter: in (mm)
Length example
ft (m)
Liquid pipe Gas pipe
a Ø1/2 (12.70) Ø1-1/8 (28.58) 246 (75)
b Ø1/2 (12.70) Ø7/8 (22.22) 65 (20)
b1 Ø3/8 (9.52) Ø5/8 (15.88) 22 (7)
c Ø3/8 (9.52) Ø5/8 (15.88) 32 (10)
d Ø3/8 (9.52) Ø3/4 (19.05) 26 (8)
e1 Ø3/8 (9.52) Ø5/8 (15.88) 22 (7)
e2 Ø1/4 (6.35) Ø1/2 (12.70) 22 (7)
f1 Ø1/4 (6.35) Ø3/8 (9.52) 19 (6)
f2 Ø1/4 (6.35) Ø3/8 (9.52) 19 (6)
f3 Ø1/4 (6.35) Ø3/8 (9.52) 19 (6)
• Limitation check
Pipe Diagram
Example Limitation
Judge
ft (m)
Total pipe length Total 498 (152)
1,312 (400)
or less
OK
Between outdoor unit and farthest indoor
unit
a + b + c + f3 364 (111)
393 (120)
or less
OK
Between the first separation tube and the
farthest indoor unit
b + c + f3 118 (36)
295 (90)
or less
OK
Between outdoor unit and the nearest
indoor unit
a + b1 269 (82)
17 (5)
or more
OK
Between outdoor unit and the first
separation tube
a 246 (75)
10 (3)
or more
OK
• Calculation of additional charge refrigerant
– Calculation of additional amount for pipe length (A)
Diameter of liquid pipe
Additional amount for pipe
length
Liquid pipe length
in (mm) lb/ft (kg/m) ft (m)
Ø1/2 (12.70) 0.077 (0.114) 311 (95)
Ø3/8 (9.52) 0.039 (0.058) 104 (32)
Ø1/4 (6.35) 0.014 (0.021) 82 (25)
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 Model name Factory charge amount
1 AOU120RLAVL 24.25 lb (11.0 kg)
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 "Piping limitation
" on
page 06-17.
2-6. Piping design example - (06-34) - 2. Piping design
SYSTEM DESIGN SYSTEM DESIGN