Refrigerant And Water Piping - Hitachi YUTAKI S80 R410A Series Installation And Operation Manual

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
5.5 Additional hydraulic necessary elements for DHW ........................................36
5.5.1 TYPE 1: Version for operation in DHW but with a remote tank ............36
5.5.2 TYPE 2: Version for operation with Hitachi DHW tank ..........................37
5.5.3 Additional hydraulic optional elements (For DHW) ..............................38
PMEN0648 rev.0 - 03/2023
(kg)) .........................25
0
5
22