Combinations Of Piping Size And Piping Length; Refrigerant Piping Size And Multikit/Distributor - Hitachi UTOPIA R32 Series Technical Catalogue

9 Piping work and refrigerant charge
Refrigerant piping range
30m
?
N O T E
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.

9.2.4 Combinations of piping size and piping length

Liquid
Ø6.35
Gas
Ø9.52 Ø12.70 Ø15.88 Ø19.05 Ø12.70 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø28.58 Ø22.20 Ø25.40 Ø28.58
30
3 HP -
(1) (2)
4 - 5 - 6 HP - -
(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.
(4).When using Ø19.05 gas pipe (soft-annealed), please switch ON DSW2-4# in the Outdoor Unit PCB.
Default combination

9.2.5 Refrigerant piping size and multikit/distributor

Select the piping connection sizes according to the following procedures
• Between outdoor unit and branch pipe: Select the same pipe connection size as the pipe size of the outdoor unit.
• Between branch pipe and indoor unit: Select the same pipe connection size as the pipe size of the indoor unit.
1 indoor unit system
88 TCGB0136 rev.1 - 05/2021
IU4
IU3
3m
3m
3m
IU2
IU1
Ø9.52
30 - 30 50 -
(2) (1)
5 5 40 75 50
(2) (2) (1) (4)
Outdoor Unit HP
3 - 6
OU1
3m
3m
OU1
Ø12.70
- - - - -
30
- - 30 -
(3)
(3) (4)
Pipe Size (L)
Gas
Ø15.88
20m
Ø15.88
- - - - -
- - - - -
(mm)
Liquid
Ø9.52