• Limitation check
Pipe Diagram
Example Limitation
Judge
ft (m)
Total pipe length Total 295 (90)
1,312 (400)
or less
OK
Between outdoor unit and farthest indoor
unit
a + b3 255 (78)
393 (120)
or less
OK
Between the first separation tube and the
farthest indoor unit
b3 22 (7)
295 (90)
or less
OK
Between outdoor unit and the nearest
indoor unit
a + b1 252 (77)
17 (5)
or more
OK
Between outdoor unit and the first
separation tube
a 232 (71)
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) 232 (71)
Ø3/8 (9.52) 0.039 (0.058) 42 (13)
Ø1/4 (6.35) 0.014 (0.021) 19 (6)
A = (0.077 lb × 232 ft) + (0.039 lb × 42 ft) + (0.014 lb × 19 ft) = 19.768 (lb)
A = (0.114 kg × 71 m) + (0.058 kg × 13 m) + (0.021 kg × 6
m) = 8.974 (kg)
– Calculation of factory charge amount (B)
Outdoor unit Model name Factory charge amount
1 AOU96RLAVL 24.25 lb (11.0 kg)
B = 24.25 lb (11.0 kg)
– Total refrigerant amount check (C)
C = A + B = 19.768 + 24.25 = 44.019 (lb) < 44.09 (lb) → OK
C = A + B = 8.974 + 11.0 = 19.974 (
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
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