Hitachi RAS-(4-12)HNP(1)(E) - Refrigerant Piping Size and Multikit;Distributor Selection

3 Piping work and
refrigerant charge
77
SMGB0087 rev.0 - 12/2013
3
3.3.5 Refrigerant piping size and multikit/distributor selection
 C A U T I O N
• DonotuserefrigerantpipesizesotherthanthoseindicatedinthisTechnicalCatalogue.Thediameteroftherefrigerant
pipesdependsdirectlyontheoutdoorunitcapacity.
• Iflargerdiametergasrefrigerantpipesareused,thecircuitlubricationoiltendstoseparatefromthegascarryingit.The
compressorwillbeseriouslydamagedduetoalackoflubrication.
• Ifsmallerdiametergasrefrigerantpipesareused,thegasorliquidrefrigerantwillhaveseriousdifcultiesincirculating.
Systemperformancewillbeaffected.Thecompressorwillrunundermoresevereconditionsthanforeseenandwillbe
damagedinashortspaceoftime.
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
2 / 2.5 Ø12.70 Ø6.35
3 - 6 Ø15.88 Ø9.52
8 Ø25.40 Ø9.52
10 / 12 Ø25.40 Ø12.70
2indoorunitssystem
(mm)
OutdoorUnitHP
PipeSize(A)
Branchpipe
Gas Liquid
2 / 2.5 Ø12.70 Ø6.35 TE-03N1
3 / 4 Ø15.88 Ø9.52
3HP: TE-03N1
4HP: TE-04N1
5 / 6 Ø15.88 Ø9.52 TE-56N1
8 Ø25.40 Ø9.52 TE-08N
10 / 12 Ø25.40 Ø12.70 TE-10N
(mm)
IndoorUnitcapacity
PipeSize(B,C)
Gas Liquid
≤ 1.5 HP Ø12.70 Ø6.35
1.8 / 2.0 HP Ø15.88 Ø6.35
> 2.3 HP Ø15.88 Ø9.52
N O T E
ConnectionsincludingIndoorUnits8and10HParenotpossible.