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PURPOSE OF HEAT PUMP
SCOPE OF DELIVERY
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 cooling or heating
of water for heating purposes and the supply of
domestic hot water!
The heat pump is suitable for mono-energetic and
bivalent operation.
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 increased heat demand during the
drying phase of new buildings. The additional heat
demand must therefore be met by special appliances
to be supplied on site. For the structural drying of
new buildings during autumn and winter, its is
recommended that an additional electric heating
element (available as an accessory) be installed.
The unit is not suited for operation
with a frequency converter.
2.2 Principle of Operation
Ambient air is drawn in by the fan and passed over a
finned heat exchanger, which extracts heat from the
air in the heating mode or gives off heat to the air in
the cooling mode. This energy difference is
transferred to the working fluid (refrigerant) in the
heat exchanger.
With the aid of an electrically driven compressor, the
absorbed heat is "pumped" to a higher temperature
level through pressure increase and - depending
on the particular application (cooling or heating) - is
given off to the heating water or the waste air via the
heat exchanger.
During heating mode, electrical energy is used to
raise the heat of the environment to a higher
temperature level. Due to the fact that the energy
extracted from the air is transferred to the heating
water, this type of appliance is referred to as air-to-
water heat pump.
The air-to-water heat pump consists of the following
main components: evaporator, fan and expansion
valve as well as the low-noise compressor, a
condenser and the electric control unit.
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 evaporator is
automatically defrosted by the heat pump, if required.
Vapour pluming may occur at the air outlet depending
on the weather conditions.
SCOPE OF DELIVERY
3.1 Baseline Unit
The heat pump is deliverd as a compact unit
containing the components listed below.
The refrigerant used is R407C.
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4
98 7 6 5
1) Evaporator 6) Receiver/
2) Control box filter drier
3) Fan 7) Circulat. pump
4) Pressostats 8) Electric heater
5) Expansion vessel 9) 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 contactors, the soft start unit as well as the
terminals for the remote control.
The control of the heat pump is effected via the
remote control included in the scope of delivery (see
also section 8.).
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CAUTION!