• 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) 49 (15)
Ø3/8 (9.52) 0.039 (0.058) 180 (55)
Ø1/4 (6.35) 0.014 (0.021) 269 (82)
A = (0.077 lb × 49 ft) + (0.039 lb × 180 ft) + (0.014 lb × 269 ft) = 14.559 (lb)
A = (0.114 kg × 15 m) + (0.058 kg × 55 m) + (0.021 kg × 82
m) = 6.622 (kg)
– Calculation of factory charge amount (B)
Outdoor unit Model name Factory charge amount
1 AOU72RLAVL 24.25 lb (11.0 kg)
B = 24.25 lb (11.0 kg)
– Total refrigerant amount check (C)
C = A + B = 14.559 + 24.25 = 38.809 (lb) < 44.09 (lb) → OK
C = A + B = 6.622 + 11.0 = 17.622 (
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
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