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GENERAL INFORMATION
1.1.2.2 Summary of operations
Space heating
YUTAKI units are factory-supplied ready for space heating operation. Different heating installation configurations can be selected
providing a comfortable atmosphere all year long even in the coldest climates:
•
Mono-valent system
The air to water heat pump is sized to provide 100% of the heating requirements on the coldest day the year.
•
Mono-energy system
This is the most popular configuration. The air to water heat pump is sized to provide 80% of the heating requirements on the
coldest days of the year. An auxiliary electric heater is used to provide the additional heating required on cold days. This option
usually results in an ideal balance between installation costs and future energy consumption, as proven by its popularity in colder
climates, such as Sweden and Norway.
•
Alternating Bi-valent system
For installations with an existing heating system by boiler, and when is needed to heat the supplied water temperature to the
circuit up to high temperatures (80ºC), the boiler can be configured to alternate with the air to water heat pump.
Selecting the different configuration types it is possible to adapt the system to all customer requirements, providing a wide
application range from the simplest configuration to complete configuration: Radiator, heating floor or both (2nd temperature area).
Domestic hot water production
YUTAKI models also give the option of domestic hot water production, allowing the user to benefit from the heat pump's high
efficiency and achieve domestic hot water.
This is made possible by a domestic hot water tank. In case of YUTAKI S COMBI, the domestic hot water tank is built in the indoor
unit. For YUTAKI S, the Hitachi accessory "DHWT-(200/300)S-3.0H2E" can be used for the production of DHW.
An electric heater is incorporated inside the tank in order to allow an immediate heating of the domestic hot water in accordance with
the user's needs.
Space cooling
YUTAKI units can also be operated in cooling operation The dedicated "Cooling kit" accessory has been designed for this purpose.
Combining the heating only models with these cooling kits, the reversible models become available. In this case, combination with
fan-coils, refreshing floor or both (2nd temperature area) can be applied.
Combination with solar panels
YUTAKI system can be combined with solar panels. The solar combination enables to heat up the DHW by means of the sun. The
solar combination is designed to transfer the heat from the solar panels (sun radiation) to the heat exchanger of DHW tank.
Swimming pool water heating operation
For summer session period, YUTAKI system can be used to heat the water temperature of swimming pools up to a value between
24 and 33ºC.
2
PMML0575 rev.1 - 09/2021
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