ENGLISH
Additionally, the following elements are required for the DHW circuit:
Nature Nº Part name
Piping connections
1 Water inlet (DHW)
2 Water outlet (DHW)
Field supplied
3
Pressure and temperature relief valve
3a Shut-off valve
3b Water check valve
3c Pressure relief valve
4 Shut-off valve
5 Draining
• 1 Shut-down valve (eld supplied): one shut-down 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-down valve
- Filling
- Draining
? NOTE
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.
6.7.3.3 Additional hydraulic optional elements (For DHW)
In case of a recirculation circuit for the DHW circuit:
Nature Nº Part name
Piping connections
1 Water inlet (DHW)
2 Water outlet (DHW)
Accessories 3
Water check valve
(ATW-WCV-01 accessory)
Field supplied
4 Water pump
5 Shut-off valve
• 1 Recirculation water pump (eld supplied): this water pump (3) will help to correctly recirculate the hot water to the DHW inlet.
• 1 Water check valve (ATW-WCV-01 accessory): this Hitachi accessory (4) is connected after the recirculation water pump (31)
in order to ensure the non-return of water.
• 2 Shut-down valves (eld supplied) (5): one before the recirculation water pump (3) and other after the water check valve
accessory (4).
REFRIGERANT AND WATER PIPING
PMML0575 rev.2 - 03/2022
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