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DOK4x HOIAO WxDEN · FD 9912
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English
Air-to-water heat pump 6 kW
2 Intended use of the heat pump
2.1 Area of application
The air-to-water heat pump is to be used exclusively for heating
of heating water and domestic hot water. It can be used in new
or existing heating systems.
The heat pump is suitable for mono energy operation at
outside air temperatures as low as -22 °C.
Proper defrosting of the evaporator is guaranteed by maintain-
ing a heating water return temperature of more than 20 °C dur-
ing continuous operation.
It is not designed for the increased heat consumption required
when a building is being dried out. For this reason, the addi-
tional heat consumption should be met using special devices
provided by the customer.
2.2 Operating principle
Surrounding air is drawn in by the fan and fed through the evap-
orator (heat exchanger). The evaporator cools the air, i.e. ex-
tracts heat from it. This extracted heat is then transferred to the
working medium (refrigerant) in the evaporator.
The heat is "pumped" to a higher temperature level by increas-
ing its pressure with the aid of the electrically driven compres-
sors. It is then transferred to the heating water via the liquefier
(heat exchanger).
Electrical energy is used to raise the temperature level of the
heat from the environment. Because the energy extracted from
the air is transferred to the heating water, this type of device is
referred to as an air-to-water heat pump.
The air-to-water heat pump consists of the main components
evaporator, fan and expansion valve, as well as the compres-
sors, the liquefier and the electrical control system.
At low ambient temperatures, humidity accumulates on the
evaporator in the form of frost, reducing the transfer of heat.
Uneven accumulation during this process does not indicate a
fault. The evaporator is defrosted automatically by the heat
pump as required. Under certain atmospheric conditions,
steam may be emitted from the air outlet.
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