Service Manual

PIPING LIMITATION
ADDITIONAL CHARGE
Additional refrigerant depends
on the liquid pipe diameter.
2010.06.15 16
a b
d
H2
H3
H4
H1
f
g
h
i
j
k
l
m
e
c
Pipe length
Total pipe length
Less than 377 ft (115 m) Total
Between outdoor unit and the farthest indoor unit
Less than 230 ft (70 m)
a + b + c + m
Between outdoor unit and branch boxes
Less than 180 ft (55 m)
Less than 197 ft (60 m)
Less than 49 ft (15 m)
Less than 49 ft (15 m)
Less than 98 ft (30 m)
Less than 98 fr (30 m)
a + b + c + d + e
Between branch box and indoor unit
Total
f + g + h + i + j + k + l + m
Each unit
10 to 49 ft (3 to 15 m)
f, g, h, i, j, k, l, m
Between outdoor unit and the first separation tube
More than 16 ft (5 m)
More than 16 ft (5 m)
a
Between outdoor unit and branch box
(When there is no separation tube)
a + d
Height difference
Between outdoor unit and indoor unit
H1
Between outdoor unit and branch box H2
Between branch boxes
H3
Between indoor units H4
Liquid pipe diameter Additional charge
1/4 in. (6.35 mm) 0.014 lbs/ft (21 g/m)
3/8 in. (9.52 mm) 0.039 lbs/ft (58 g/m)
PIPE DIAMETER
Liquid pipe
Gas pipe
AOU48RLXFZ
3/8 in. (9.52 mm)
ASU18RLF
AUU18RLF
ARU18RLF
ASU24RLF
ARU24RLF
ASU7, 9, 12RLF
AUU9, 12RLF
ARU9, 12RLF
5/8 in. (15.88 mm)
1/4 in. (6.35 mm)
1/2 in. (12.7 mm) 3/8 in. (9.52 mm) 1/2 in. (12.7 mm) 5/8 in. (15.88 mm)
Branch box,
main (x1)
Branch box,
branch (x3)