Hitachi UTOPIA R410A Series - Maximum Lenght of Refrigerant Piping

9 Piping work and refrigerant charge
Refrigerant piping range
TCGB0136 rev.1 - 05/2021
86
9.2.3 Maximum lenght of refrigerant piping
(m)
Outdoor Unit 3 HP 4 HP 5 HP 6 HP
Maximum piping length between
the outdoor unit and the farthest
indoor unit
Actual length (L)
50 75
Equivalent length (EL)
70 95
Total piping length
2 units (A+B+C)
50 85
3 units (A+B+C+D)
-- 85
4 units (A+B+C+D+E+F+G)
-- 85
Maximum piping line after first
branch
2 units (B, C)
15 15
2 and 3 units (B, C, D)
-- 15
4 units (B+D, B+E, C+F, C+G)
-- 15
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 length difference of the several branches:
< 8 < 10
(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)
Example:
? 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.