Hitachi YUTAKI S80 Serie Manuel D'instructions page 15

REFRIGERANT AND WATER PIPING
- For DHW tank beside the indoor unit (both right or left side), the pipes factory-supplied with the DHW tank accessory (11) are
not required. In this case, the dedicated Hitachi flexible water pipe kit (ATW-FWP-02 accessory) (12) is needed. This kit is
provided with the following items:
Š 4 flexible water pipes (Two pipes (12a) to connect to the indoor unit (3-way (8) valve and T-branch (9)) and other two
pipes (12b) to connect to the heating coil inlet/outlet connections of the DHW tank (5-6). To connect the indoor unit with
the DHW tank, two additional field-supplied pipes are required (13).
Š 9 gaskets (2 gaskets for each flexible water pipe end and 1 spare gasket).
Š 3 extension cables (1 for the tank's electric heater, 1 for the tank's thermistor and 1 for the unit controller).
Additionally, the following elements are required for the DHW circuit:
• 1 Shut-down valve (field supplied): one shut-down 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:
- 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.
7 PMML0344B rev.2 - 01/2021
Type 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
Part name
Shut-off valve
Water check valve
Pressure relief valve