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4 Capacity and selection
data
TCGB0070 rev.3 - 04/2012
69
4
•
Mono-energy system
The YUTAKI S system is sized to provide 80% of the heating requirements on the coldest day of the year. An auxiliary
electric heater (inside the indoor unit) is used to provide the additional heating required on the coldest days.
Example of Mono-energy system (Mono-valent)
N O T E
•
T
A
: Outdoor ambient temperature (ºC).
• 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
-20
20
T
A
•
Alternating Bi-valent system
The boiler is configured to alternate with the YUTAKI S system.
Example of Alternating Bi-valent (Only boiler)
Example of Alternating Bi-valent ( boiler)
-20
20
Air to water heat
pump Capacity
Heat Demand
Air to water heat pump
Boiler
Bi-valent point
P
H
T
A
Air to water heat
pump capacity
Heat demand
Air to water heat pump only
Air to
water heat
pump +
Heater
Air to water heat
pump + EH capacity
Boiler
-20
20
P
H
T
A
The example given in this chapter is based on a Mono-energy system, allowing for an unit with electrical heater to be used
(auxiliary electric heater available to cover temporary heating requirements on the coldest days of the year).
In installations which already have a conventional boiler (gas/oil), it can be used to alternate with YUTAKI S system (electric
heater enabled or disabled) which will help to increase the overall performance of the whole installation significantly.
In any case, the calculation example can be applied to all the energy systems mentioned.