Hitachi YUTAKI S COMBI Series Instruction Manual page 26

REFRIGERANT AND WATER PIPING
4.4.2 Additional hydraulic necessary elements
for DHW
YUTAKI S COMBI is factory-supplied ready for DHW operation
(Fitted with DHW tank and 3-way valve). Only the following
elements are required in the DHW circuit:
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
• 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.
8 PMML0573 rev.1 - 07/2021
Part name
Shut-off valve
Water check valve
Pressure relief valve
4.4.3 Additional hydraulic optional elements
(For DHW)
In case of a recirculation circuit for the DHW circuit:
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
• 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).
4.4.4 Additional hydraulic necessary elements
for DHW (only for UK market)
Nature Nº
T&P relief valve outlet pipe Ø15
1
(factory supplied)
Piping connections
2 Tundish outlet pipe (Field supplied)
Pressure and Temperature relief valve
Accessories 3
(Factory supplied)
4 Tundish (Field supplied)
Field supplied
5 Drain (Field supplied)
Part name
Part name