Hitachi YUTAKI S80 Series - System Configurations

11. Installation conguration
TCGB0075 rev.0 - 11/2012
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11.1 System congurations
The YUTAKI S80 will generate hot water up to 80ºC and it is ideal for existing properties, in particular older establishments
where higher water supply temperatures may be required to keep the house warm – as well as for new builds. It is designed
for boiler substitution, offering heating and sanitary hot water all year round, without boiler back-up.
The YUTAKI S80 is designed to work in a mono-valent, mono-energetic or bi-valent heating systems. It provides efcient
control and reduces energy use while maintaining comfort in the building.
The functionality of the YUTAKI S80 unit depends on the installed components and the selected conguration and it can
be congured and upgraded to meet many application requirements.

Mono-valent system
The YUTAKI S80 is sized to provided 100% of the heating requirements on the coldest days of the year.
Example of Mono-valent system
N O T E
• T
A
: Outdoor ambient temperature.
• P
H
: Heating capacity.
Air to water heat
pump Capacity
Heat Demand
Air to water heat pump
Design point
P
H
T
A

Mono-energy system
The YUTAKI S80 is sized to provide approximately 80% of the heating requirements in the coldest days of the year. An
auxiliary electric heater (as accessory) is used to provide the additional heating required on cold days.
Example of Mono-energy system
N O T E
• T
A
: Outdoor ambient temperature.
• P
H
: Heating capacity.
• SP1/2/3:Heatersteps.
• Bivalent point can be set through the LCD
user’s interface.
Air to water heat
pump + EH capacity
Air to water heat
pump capacity
Heat demand
Air to water heat pump
Air to water
heat pump +
Heater
Bi-valent point
P
H
T
A