Maximum Lenght Of Refrigerant Piping - Hitachi UTOPIA R32 Series Technical Catalogue

9 Piping work and refrigerant charge
Refrigerant piping range

9.2.3 Maximum lenght of refrigerant piping

Maximum piping length between
the outdoor unit and the farthest
indoor unit
Total piping length
Maximum piping line after first
branch
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)
?
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 Multi-Kits at the same horizontal level.
86 TCGB0136 rev.1 - 05/2021
Outdoor Unit
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 units (B, C)
2 and 3 units (B, C, D)
4 units (B+D, B+E, C+F, C+G)
Example:
3 HP 4 HP 5 HP
50 75
70 95
50 85
-- 85
-- 85
15 15
-- 15
-- 15
30 / 20
3
3
< 8 < 10
(m)
6 HP