Maximum Refrigerant Piping Length - Hitachi RAS-(3-6)HVNC1(E) Service Manual

3 Piping work and
refrigerant charge

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)
Maximum length 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)
73
SMGB0087 rev.0 - 12/2013
2HP 2.5HP 3HP
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)
4 and 3 units (B+C+D)
4 units (B+D, B+E, C+F,
C+G)
4HP 5HP
50 75
70 95
50 60 85
-- 60 95
-- 95
10
-- 10
A > B, C, D, E, F, G
30 / 20
3
3
< 8
(m)
6HP 8HP 10HP 12HP
100
125
100 115
100 130
100 145
15
15
10
3