Hitachi RAS-2-HVNP Service Manual page 78

3. Piping work and refrigerant charge
IVX Standard series
Outdoor Unit
Maximum piping length
between the outdoor unit
and the farthest indoor
unit
Total piping length
Maximum piping line
after first branch
Main piping length A
Maximum height difference
Outdoor / Indoor (H)
(Outdoor Unit is Higher / Lower.)
Maximum height difference Indoor / Indoor
Maximum height difference:
branch pipe/Indoor (2,3 and 4 indoor units system)
branch pipe/branch pipe (4 indoor units system)
(B-C) / (B-D) / (C-D) / (C+G)-(B+E) / (C+G)-(B+D) /
(C+F)-(B+E) / (C+F)-(B+D)
N O T E
• The liquid piping and the gas piping must be of the same piping length and run along the same route.
• Install the branch piping as much as possible near the indoor units
• Install Multikits at the same horizontal level.
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Actual Length (L)
Equivalent Length (EL)
2 units (A+B+C)
3 units (A+B+C+D)
4 units
(A+B+C+D+E+F+G+)
2 and 3 units (B, C, D)
4 units
(B+D, B+E, C+F, C+G)
SMGB0079 rev.0 - 01/2013
3HP 4HP 5HP
50 70 75
70 90 95
60 80 85
-- 90 95
-- 90 95
10
-- 10
A > B, C, D, E, F, G
6HP 8HP 10HP
100
125
100 115
100 130
100 145
15
15
30 / 20
3
3
< 8
(m)
12HP