Hitachi RAS-(2-6)HVNP1(E), Service Manual

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3 Piping work and
refrigerant charge
74
SMGB0087 rev.0 - 12/2013
IVX Standard series
(m)
Outdoor Unit 3HP 4HP 5HP 6HP 8HP 10HP 12HP
Maximum piping length bet-
ween 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
Maximum lenth difference of the several branches:
(B-C) (2 and 3 unit system)
(B-D) (3 unit system)
(C-D) (3 unit system)
(C+G)-(C+F) (4 unit system)
(B+E)-(B+D) (4 unit system)
(C+G)-(B+E) (4 unit system)
(C+G)-(B+D) (4 unit system)
(C+F)-(B+E) (4 unit system)
(C+F)-(B+D) (4 unit system)
< 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.