3
About your heat pump
3.1
Heat pump components
The heat pump is a complete heat pump installation for heating and hot water. Certain models have an inte-
grated water heater. Using the TWS (Tap Water Stratification) technology, more effective heat transfer and effi-
cient layering of the water in the water tank is achieved.
The heat pump is equipped with control equipment, which is operated using a control panel.
Heat is distributed throughout the house via a water-borne heating system. The heat pump supplies as much
of the heat demand as possible before auxiliary heating is engaged and assists.
The heat pump consists of five basic units:
3
4
5
1
2
1
Heat pump unit with compressor, heat exchanger, circulation
pumps for brine and heating systems, valves and safety equip-
ment.
2
Water heater
3
Exchange valve or shunt valve that the heated water either
passes through to the heating system or to the water heater
depending on whether heating or hot water is to be produced.
4
Auxiliary heater with an electrical heater installed on the heat-
ing system’s supply line.
5
Control equipment.
3.2
Outdoor and defroster function
Applies to Atria.
Atria are equipped with an outdoor unit that uses air as a heat source down to -20°C. The outdoor unit has a
coil that uses brine to recover energy from the outside air. During normal operation the coil becomes cold as
energy is lost through the exchange of heat. In humid air conditions it may build up a layer of ice. Atria has an
automatic function to defrost the coil by reusing the heat energy produced. When required, a defrosting se-
quence is triggered. The defrosting sequence is described as follows:
User Guide
Domestic heat pumps
Thermia Värmepumpar
VUGFD202
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