Combinations Of Piping Size And Piping Length - Hitachi UTOPIA R32 Series Installation And Operation Manual

◆ Maximum height difference (clarification)

NOTE
All pictures are as example. Branch and headers are not showed as real sizes or real picture, for the
installation of this components follow the technical documentation.
6.1.3 Combinations of piping size and piping length
Liquid
Gas
Performance capacity
2 HP
2.5 HP
3 HP
Standard
(1) Reducing gas pipe size will lower cooling capacity due to larger pressure loss in gas piping and narrow operation
range.
(2) Reducing liquid pipe size will narrow operation range due to indoor unit relation with expansion valve capacity.
(3) Increasing liquid pipe size will require additional refrigerant charge.
PMEN0654 rev.0 - 12/2023
OU1
30m
IU1
OU1
Ø6.35
Ø9.52 Ø12.70
15 50
(1)
- 50
- 30
(1) (2)
OU1
IU2
3m
3m
3m
IU1
OU1
Ø15.88 Ø19.05
(m)
30 -
30 -
30 -
(2)
Ø9.52
Ø12.70 Ø15.88
15 15
(3) (3)
20 20
(3) (3)
30 50
(1)
30
6