Hitachi Yutaki s80 Serie Manual De Instrucciones página 21

REFRIGERANT AND WATER PIPING
Additionally, the following elements are required for the DHW circuit:
• 1 Shut-down valve (field 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
?
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.
4.3.3 Additional hydraulic optional elements (For DHW)
In case of a recirculation circuit for the DHW circuit:
• 1 Recirculation water pump (field 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 (field supplied) (5): one before the recirculation water pump (3) and other after the water check valve
accessory (4).
11 PMML0340B rev.1 - 03/2016
Nature Nº
1 Water inlet (DHW)
Piping connections
2 Water outlet (DHW)
Pressure and temperature relief valve
3a
3
3b
Field supplied
3c
4 Shut-off valve
5 Draining
Nature Nº
1 Water inlet (DHW)
Piping connections
2 Water outlet (DHW)
Water check valve
Accessories 3
(ATW-WCV-01 accessory)
4 Water pump
Field supplied
5 Shut-off valve
Part name
Shut-off valve
Water check valve
Pressure relief valve
Part name