Hitachi YUTAKI RWM-2R1E Installation & Operation Manual page 78

REFRIGERANT AND WATER PIPING
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:
• 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:
64 PMML0575 rev.2 - 03/2022
Nature Nº
1
2
3
Piping connections
4
5
6
Factory supplied 7
8
Accessories
9
10
Field supplied
11
Nature Nº
1
Piping connections
2
3
Field supplied
4
5
Part name
Water inlet (Space heating)
Water outlet (Space heating)
Heating coil inlet
Heating coil outlet
Water inlet (DHW)
Water outlet (DHW)
Shut-off valve (factory-supplied)
Domestic hot water tank
(DHWT-(200/300)S-3.0H2E accessory)
3-way valve
(ATW-3WV-01 accessory)
T-branch
Heating coil pipes
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