Hitachi EV-1.5N1, Service Manual

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3. Piping work and refrigerant charge
64
SMGB0079 rev.0 - 01/2013
IVX Standard series
(m)
Outdoor Unit 3HP 4HP 5HP 6HP 8HP 10HP 12HP
Maximum piping length
between the outdoor unit
and the farthest indoor
unit Actual Length (L)
50 70 75 100
Equivalent Length (EL)
70 90 95 125
Total piping length
2 units (A+B+C)
60 80 85 100 115
3 units (A+B+C+D)
-- 90 95 100 130
4 units
(A+B+C+D+E+F+G+)
-- 90 95 100 145
Maximum piping line
after first branch
2 and 3 units (B, C, D)
10 15
4 units
(B+D, B+E, C+F, C+G)
-- 10 15
Main piping length A
A > B, C, D, E, F, G
Maximum height difference
Outdoor / Indoor (H)
(Outdoor Unit is Higher / Lower.)
30 / 20
Maximum height difference Indoor / Indoor
3
Maximum height difference:
branch pipe/Indoor (2,3 and 4 indoor units system)
branch pipe/branch pipe (4 indoor units system)
3
(B-C) / (B-D) / (C-D) / (C+G)-(B+E) / (C+G)-(B+D) /
(C+F)-(B+E) / (C+F)-(B+D)
< 8
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.