Hitachi RAS-2-HVNP Service Manual page 77

3. Piping work and refrigerant charge
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Maximum refrigerant piping length
IVX Premium 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)
63
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
2HP 2.5HP 3HP 4HP
50
70
50 60
-- 60
--
10
--
A > B, C, D, E, F, G
3
5HP 6HP 8HP 10HP
75 100
95 125
85 100 115
95 100 130
95 100 145
15
10 15
30 / 20
10
3
< 8
(m)
12HP
3