16 PMML0291A rev.2 - 09/2014
SYSTEM DESCRIPTION
2.2.1 Space heating main notes (Heating coil)
NOTE
The DHW Tank is designed to work with the YUTAKI S80 system
air to water heat pump only. Therefore, the tank’s heating coil will
be heated by the YUTAKI S80 indoor unit and not need specic
intermediate elements.
2.2.2 DHW main notes
• The pressure and temperature relief valve accessory (DH-
WT-SWG-01: pressure setting 7 bar) must be installed at the
DHW inlet connection of the tank (as close as possible to the
tank) to provide the following functions:
- Pressure protection
- Non-return function
- Shut-off valve
- Filling
- Draining
• 1 shut-off valve (eld supplied) must be installed in the DHW
outlet connection, in order to make easier any maintenance
work.
• If the domestic cold water entry pressure is higher than the
equipment’s design pressure (6 bar), a pressure reducer must
be tted with a nominal value of 7 bar.
NOTE
For more details, please refer to the section DHW hydraulic circuit.
HITACHI is introducing a new Domestic Hot Water Tank to work
with the YUTAKI S80 system only. It provides high quality domes-
tic hot water for human beings.
HITACHI offers two DHW tanks (DHWS195S-2.0H1E and
DHWS260S-2.0H1E) that can be combined only with the YUTAKI
S80 indoor unit (integrated or beside the indoor unit), allowing the
user to benet from the heat pump’s high efciency and achieve
hot water up to 75ºC.
In the integrated option the tank is mounted over the indoor unit.
For separated option, on the oor beside to the indoor unit, the
dedicated Flexible Water Pipes Kit (ATW-FWP-01) is required.
The DHW Tank is designed to be installed with he YUTAKI S80
system. In case another tank is used, HITACHI cannot guarantee
the system good operation.
The DHW tank is made with high advanced technology using
stainless steel chemically descaled and passivated materials.
It has been designed to be high thermal efcient insulated with
rigid, mould-injected, Neopor EPS.
The DHW Tank has been designed to have a compact size to
reduce the installation space and to eliminate the cold zones at
the bottom of the storage tank to prevent the risk of bacteria pro-
liferation (e.g. Legionella).
The system is simple to control; its remote controller (PC-S80TE)
is integrated on the DHW tank and is a variation of the well-re-
ceived and successful design used with the existing YUTAKI S
system, which includes a helpful LCD graphic display, one-touch
holiday button, weekly timer and frost protection.
3 SYSTEM DESCRIPTION
2.2 GENERAL NOTES FOR HYDRAULIC SYSTEM
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