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2
Purpose of Heat Pump
2.1 Field of Application
The air-to-water heat pump is intended for use in existing or
newly built heating systems.
The heat pump is designed for the heating of water for heating
purposes and the supply of domestic hot water!
The heat pump is suitable for mono-energetic and bivalent oper-
ation.
During heating mode, a heating water return temperature of
more than 18 °C must be maintained in order to assure proper
defrosting of the evaporator.
The heat pump is generally not designed for satisfying any in-
creased heat demand during the drying phase of new buildings.
The additional heat demand must therefore be met by special ap-
pliances to be supplied on site. If a building is to be dried out in
the autumn or winter, we recommend installing an additional
electric heating element in the buffer tank (available as acces-
sory).
ATTENTION!
The unit is not suited for operation with a frequency converter.
2.2 Principle of Operation
Surrounding air is drawn in by the ventilator and passed over a
finned heat exchanger. During operation, this extracts heat from
the air and transfers it to the working medium (refrigerant) in the
heat exchanger.
The heat is "pumped" to a higher temperature level by increasing
its pressure with the aid of an electrically driven compressor. It is
then transferred to the heating water via a steel plate heat ex-
changer.
As the energy extracted from the air is transferred to the heating
water, this type of device is called an air-to-water heat pump.
The air-to-water heat pump consists of these main components:
evaporator, compressor, liquefier, ventilator, expansion valve
and the electrical control system. For the heating and water cir-
cuit, a circulating pump and electric reheating, as well as an ex-
pansion vessel and pressure relief valve, are already integrated
into the device.
In the case of low ambient temperatures in the heating mode,
moisture contained in the air may accumulate on the evaporator
in the form of frost thus impairing the heat transfer. The evapora-
tor is automatically defrosted by the heat pump, if required. Va-
pour pluming may occur at the air outlet depending on the
weather conditions.
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Scope of Delivery
3.1 Baseline Unit
The heat pump is deliverd as a compact unit containing the com-
ponents listed below.
1)
Evaporator (covered)
2)
Control box
3)
Fan (covered)
4)
Pressostats
5)
Expansion vessel
6)
Circulat. pump
7)
Electric heater
8)
Compressor
3.2 Control Box
The control box is integrated in the heat pump. It is accessible
after removal of the cover panel (the fastening screw holes of the
cover panels are capped).
The control box houses the mains terminals, the power contac-
tors, the soft start unit as well as the terminals for the remote con-
trol.
The heat pump is operated via the remote control included in the
scope of supply (see also section 8).
3.2
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