Hitachi YUTAKI S80 R410A Series Installation And Operation Manual page 7

4.1 Power supply working range ...........................................................................17
4.2 Temperature working range ............................................................................17
4.2.1 Space heating ........................................................................................17
4.2.2 DHW .......................................................................................................18
4.2.3 Swimming pool heating .........................................................................18
4.3 Hydraulic working range ..................................................................................19
4.3.1 Hydraulic data ........................................................................................19
4.3.2 Pump performance curves ....................................................................20
4.3.2.1 Version for indoor unit alone ...................................................20
4.3.2.2 Version for combination with DHW tank .................................21
5. Refrigerant and water piping
5.1 General notes before performing piping work ...............................................23
5.2 Refrigerant circuit ............................................................................................24
5.2.1 Refrigerant piping ..................................................................................24
5.2.1.1 Refrigerant charge before shipment (W
5.2.2 Precautions in the event of gas refrigerant leaks ..................................25
5.3 Water piping ....................................................................................................27
5.3.1 Water piping length ...............................................................................27
5.3.2 Water piping size ...................................................................................27
5.3.3 Water quality for primary (space heating/cooling) and secondary
(DHW) circuit..........................................................................................30
5.3.3.1 Water filling ..............................................................................32
5.3.4 Requirements and recommendations for the hydraulic circuit ............34
5.3.5 Water flow control .................................................................................35
5.4 Space heating and DHW ..................................................................................36
5.4.5.1 Additional hydraulic necessary elements for space heating ...36
PMEN0648 rev.0 - 03/2023
....................................................................................22
(kg)) .........................25
0
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