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Necessary conditions
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refrigerant branch kit for the indoor
unit beyond 130 ft. (40 m).
If upsizing is impossible, the condi-
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If the upsized line would become
larger than the main pipe, then the
main pipe should also be upsized.
2. The total piping length, calculated
by doubling the piping length as
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(The main pipe, and lines that are
not upsized, should not be doubled.)
3. The actual piping length from each
indoor units to the nearest refriger-
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4. The difference between the actual
piping length from the outdoor unit
to the farthest indoor unit, and the
actual piping length from the outdoor
unit to the nearest indoor unit, is
In the case of a multi Branch Selector unit, if a junction pipe kit (separately sold) is used for combining 2 lines, the actual piping length between the
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1. Upsize the liquid line between the joined 2 branches and the indoor unit.
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3. Double the pipe length of upsized line between joined 2 branches and the indoor unit, when calculating the overall total piping length.
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Upsize the liquid pipes b, c, d, e, f and g in the
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lows:
f3/8 in. (9.5 mm) → f1/2 in. (12.7 mm)
f1/2 in. (12.7 mm) → f5/8 in. (15.9 mm)
f5/8 in. (15.9 mm) → f3/4 in. (19.1 mm)
f3/4 in. (19.1 mm) → f7/8 in. (22.2 mm)
a +b×2+c×2+d×2+e×2+f×2+g×2
+h+i+j+k+l+m+n+p+q+r+s
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Actual piping length of 9
Actual piping length of 1
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Outdoor unit
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b
A
B
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B1
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2
From outdoor unit to the farthest indoor unit 9
From outdoor unit to the nearest indoor unit 1
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oor
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Branch Selector units (B1-B7)
REFNET joints
(A-G)
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e
f
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C
D
E
F
G
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k
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B2
B3
B4
B5
B6
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Indoor unit (1-9)
b c d e f g p 130 ft. ( 0 m)
3P362438-5N English
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B7
9
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