The indoor unit consists of:
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Colour touch screen (CM)
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Relay circuit board (BM)
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Insulated stainless water heater
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Temperature sensors
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1x pwm controlled circulation pump (Athena Compact & Athena Total 300L)
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2x pwm controlled circulation pumps (Athena Total EQ)
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Extra volume tank 60L for space heating system (Athena Total EQ)
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Electric immersion heater for space heating and tap water heating
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Reversing valve between heating and tap water
Heating system
In your heating system, water is circulating from the heat pump through radiators or floor heating and back
again to provide heating to the building, and to prevent freezing, except during summer when there is no need
for heating . If you have cooling installed, the cooling is supplied in a similar way, often to fan coils or under
floor systems prepared for cooling*.
* Cooling function is for Athena HC only. Athena HC is only available in certain markets.
Note: During the outdoor unit's defrost cycle, it is common that quite a lot of steam comes from the unit. This is
a natural process to keep the outdoor unit from building up ice, from water condensation.
Heat curve & supply line temperature
The heat pump is automatically calculating how much heat it has to produce to keep a comfortable indoor
climate based on the measured outdoor temperature and the settings made on the so called "heat curve" in
the heat pump control.
The temperature of the water supplied from the heat pump to the heating system is called "supply line temper-
ature" as it is the temperature that is supplied from the heat pump to the heating system.
The supply line temperature needs to be increased when the outdoor temperatures gets lower because more
heat is required to the heating system when it gets colder outside to keep the same indoor temperature. This is
what the "heat curve" makes sure.
The heat curve settings are normally adjusted by the heat pump installer, but fine tuning to the specific house
conditions and individual preferences may be required after some time to obtain desired indoor climate in all
weather conditions.
A correctly set heat curve saves energy, gives a very good indoor climate and often also reduces the need of
maintenance.
General guidance:
In order to increase the indoor temperature with 1 degree, the supply line temperature should often be in-
creased by 3 °C in radiator systems and 2 °C in floor heating systems.
User Guide
Athena
Thermia AB AWAT01UG0102
9
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