Hitachi RAS-(4-12)HNP(1)(E) - Refrigerant Piping Range; Refrigerant Piping Length; Piping System for Header Branch

3 Piping work and
refrigerant charge
72
SMGB0087 rev.0 - 12/2013
3.3 Refrigerantpipingrange
3.3.1 Refrigerant piping length
The refrigerant piping between the indoor unit and the outdoor unit should be designed using the following chart.
Keep the design point within the area of the chart, which is showing the applicable height difference according to piping
length.
Height difference (m)
Total length between outdoor unit and each
indoor unit
When outdoor
unit is installed
higher than
indoor unit
When outdoor
unit is installed
lower than
indoor unit
Factory Setting
3.3.2 Piping system for header branch
1indoorunitsystem(O.U.from2to10HP) 2indoorunitssystem(O.U.from2to12HP)
3indoorunitssystem(OUfrom4to12HP) 4indoorunitssystem(OUfrom4to12HP)
(pictures are as example)
N O T E
8and10HPIndoorUnitsallowedfor1indoorunitcombinationsystemonly.
≤5 m
≥30 m