Hitachi UTOPIA R32 Series Installation And Operation Manual page 38

◆ Maximum refrigerant piping length
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 indoor units system
Maximum length difference of the several branches: (B-C) (2 unit system)

NOTE
• 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 Multi-Kits at the same horizontal level.
PMEN0654 rev.0 - 12/2023
Outdoor Unit
Actual length (L)
Equivalent length (EL)
2 units (A+B+C)
2 units (B, C)
2 HP 2.5 HP
50 50
70 70
-- --
-- --
-- --
30 / 20 30 / 20
-- --
-- --
-- --
3 HP
50
70
50
15
A > B, C
30 / 20
3
3
< 8
6
29