Hitachi UTOPIA RAS-4HVRP2E - System Installation

3 Piping work and refrigerant charge
Refrigerant piping range
SMGB0136 rev.0 - 07/2021
56
3.3.6 System installation
? NOTE
• Pipe connection size on outdoor units, indoor units and the multikit or distributor vary according to the system.
• The sizes of the indoor and outdoor units could be different. Adjust the are adapter (accessory) to the indoor pipe connection in these
cases.

Height difference between indoor units and distributor
It is recommended to install all indoor units at the same height. When the height difference between the indoor units due
to building construction is necessary, this should be less than the value indicated in the table.
Maximum height difference (clarication)
≤≤≤≤
20m
≤
30m
IU1
OU1
OU1
ืืืื
20m
ื
30m
IU1
IU2
OU1
OU1
ื
3m
ื
3m
ื3m
ืืืื
20m
ืืืื
30m
IU1
IU3
IU2
IU2
OU1
OU1
ื
3m
ื
3m
ื
3m
ื
3m
ื3m