Hitachi YUTAKI S Series Installation And Operation Manual page 37

YUTAKI S is not factory-supplied ready for DHW operation, but it can be used for the production of
DHW if the following elements are installed:
• A domestic hot water tank (DHWT-(200/300)S-3.0H2E accessory) (8) has to be installed in
combination with the indoor unit.
• A 3-way valve (ATW-3WV-01 accessory) (9) must be connected at one point of the water outlet
pipe of the installation.
• A T-branch (field supplied) (10) must be connected at one point of the water inlet pipe of the
installation.
• Two water pipes (field supplied) (11). One pipe between 3-way valve and the heating coil inlet
(3) of the DHW tank, the other one between the T-branch and the heating coil outlet (4) of the
DHW tank.
Additionally, the following elements are required for the DHW circuit:
Nature
Piping connections
Field supplied
• 1 Shut-off valve (field supplied): one shut-off 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:
PMEN0643 rev.0 - 04/2023
DHW TANK
No.
1 Water inlet (DHW)
2 Water outlet (DHW)
Pressure and temperature relief valve
3a Shut-off valve
3
3b Water check valve
3c Pressure relief valve
4 Shut-off valve
5 Draining
Part name
5
28