Hitachi UTOPIA RAS-4 Series - Combinations of Piping Size and Piping Length; Refrigerant Piping Size and Multikit;Distributor

9 Piping work and refrigerant charge
Refrigerant piping range
TCGB0136 rev.1 - 05/2021
88
ืืืื
20m
ื
30m
IU1
IU4
IU3
IU2
OU1
OU1
ื
3m
ื
3m
ื
3m
ื
3m
ื3m
? 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.
9.2.4 Combinations of piping size and piping length
Liquid
Ø6.35 Ø9.52 Ø12.70 Ø15.88
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
3 HP -
30
(1) (2)
30
(2)
- 30
(1)
50 - - - - - - - - - - -
4 - 5 - 6 HP - - 5
(2)
5
(2)
40
(1)
75 50
(4)
- - 30
(3)
30
(3) (4)
- - - - - -
(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
(mm)
Outdoor Unit HP
Pipe Size (L)
Gas Liquid
3 - 6 Ø15.88 Ø9.52