Hitachi RWM-2.5NE Instruction Manual page 15

REFRIGERANT AND WATER PIPING
4.3 SPACE HEATING AND DHW
!
D A N G E R
Do not connect the power supply to the indoor unit prior to filling the space heating circuit (and DHW circuit if it were the case) with water
and checking water pressure and the total absence of any water leakage.
4.3.1 Additional hydraulic necessary elements for space heating
The following hydraulic elements are necessary to correctly perform the space heating water circuit:
• Two shut-off valves (factory supplied accessory) (3) must be installed in the indoor unit. One at the water inlet connection (1)
and the other at the water outlet connection (2) in order to make easier any maintenance work.
• A water check valve (ATW-WCV-01 accessory) (5) with 1 shut-off valve (field supplied) (4) must be connected to the water
filling point when filling the indoor unit. The check valve acts as a safety device to protect the installation against back pressure,
back flow and back syphon of non-potable water into drinking water supply net.
4.3.2 Additional hydraulic necessary elements for DHW
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-(200/260)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.
7 PMML0336B rev.1 - 03/2016
Nature No.
1 Water inlet (Space heating)
Piping connections
2 Water outlet (Space heating)
Factory supplied 3 Shut-off valve (factory-supplied)
Water check valve
Accessories 4
(ATW-WCV-01 accessory)
Field supplied 5 Shut-off valve
Nature
Piping
connections
Factory supplied
Accessories
Field supplied
Part name
Nº Part name
1 Water inlet (Space heating)
2 Water outlet (Space heating)
3 Heating coil inlet
4 Heating coil outlet
5 Water inlet (DHW)
6 Water outlet (DHW)
7 Shut-off valve (factory-supplied)
Domestic hot water tank
8 (DHWT-(200/300)S-3.0H2E
accessory)
3-way valve
9
(ATW-3WV-01 accessory)
10 T-branch
11 Heating coil pipes