Additional Hydraulic Optional Elements (For Dhw) - Hitachi YUTAKI S COMBI Series Installation And Operation Manual

✓ 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.
5.4.4.3 Additional hydraulic optional elements (For DHW)
In case of a recirculation circuit for the DHW circuit:
Nature
Piping connections
Accessories
Field supplied
• 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).
PMEN0645 rev.0 - 04/2023
DHW TANK
No.
1 Water inlet (DHW)
2 Water outlet (DHW)
Water check valve
3
(ATW-WCV-01 accessory)
4 Water pump
5 Shut-off valve
Part name
5
31