Hitachi YUTAKI RWM-2R1E Installation & Operation Manual page 81

REFRIGERANT AND WATER PIPING
• 1 Shut-down valve (field supplied): one shut-down valve (4) must be connected after the DHW water 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 water 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.
6.7.2.3 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 (4) will help to correctly recirculate the hot water to the DHW
water inlet.
• 1 Water check valve (ATW-WCV-01 accessory): this Hitachi accessory (3) is connected after the recirculation water pump (4)
in order to ensure the non-return of water.
• 2 Shut-down valves (field supplied) (5): one before the recirculation water pump (4) and other after the water check valve
accessory (3).
67 PMML0575 rev.2 - 03/2022
Nature Nº
1
Piping connections
2
3
Field supplied
4
5
Nature Nº
1
Piping connections
2
Accessories 3
4
Field supplied
5
Part name
Water inlet (DHW)
Water outlet (DHW)
Pressure and temperature relief valve
3a Shut-off valve
3b Water check valve
3c Pressure relief valve
Shut-off valve
Draining
Part name
Water inlet (DHW)
Water outlet (DHW)
Water check valve
(ATW-WCV-01 accessory)
Water pump
Shut-off valve