Hitachi YUTAKI S Series Technical Catalogue page 108

8 Refrigerant and water piping
Space heating and DHW
8.3.2 Additional hydraulic necessary elements for DHW
The next hydraulic elements are necessary to correctly perform the domestic hot water circuit:
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COMMON
The following elements are required for all YUTAKI units.
• 1 Shut-off valve (field supplied): one shut-off valve (4) must be connected after the DHW outlet connection of the
DHW tank (2) in order to make easier any maintenance work.
• A Security water valve (Field-supplied): this accessory (3) is a pressure and temperature relief valve that must be
installed as near as possible to the DHW inlet connection of the DHW tank (1). It should ensure a correct draining (5)
for the discharge valve of this valve. This security water valve should provide the following:
- Pressure protection
- Non-return function
- Shut-off valve
- Filling
- Draining
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N O T E
The discharge pipe should always be open to the atmosphere, free of frost and in continuous slope to the down side in case that water
leakage exists.
100 TCGB0123 rev.2 - 10/2019
Type Nº
1 Water inlet (DHW)
Piping
connections
2 Water outlet (DHW)
Pressure and temperature relief valve
3a Shut-off valve
3
3b Water check valve
Field supplied
3c Pressure relief valve
4 Shut-off valve
5 Draining
Part name