Hitachi YUTAKI S80 Series - Page 69

4. Capacity and selection data
TCGB0075 rev.0 - 11/2012
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Mono-valent system
The YUTAKI S80 is sized to provide 100% of the heating requirements on the coldest day 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
Alternating Bi-valent system
The boiler is congured to alternate with the split air to water heat pump. A hydraulic separator of buffer tank has to be used
to ensure hydraulic balancing.
Example of Alternating Bi-valent system
N O T E
• T
A
: Outdoor ambient temperature.
• P
H
: Heating capacity.
• Bivalent point can be set through the LCD
user’s interface.
Air to water heat
pump Capacity
Heat Demand
Air to water heat pump
Boiler
Bi-valent point
P
H
T
A