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2
Purpose of the Heat
Pump
2.1 Application
The air-to-water heat pump is to be used exclusively for the heat-
ing and cooling of heating water. It can be used in new or previ-
ously existing heating systems.
In heating operation, the heat pump is suitable for mono energy
and bivalent operation down to an external temperature of
-25 °C.
Proper defrosting of the evaporator is guaranteed by maintaining
a heating water return flow temperature of more than 18 °C dur-
ing continuous operation.
The heat pump is not designed for the increased heat consump-
tion required when a building is being dried out. The additional
heat consumption should be met using special devices provided
by the customer. If a building is to be dried out in autumn or win-
ter, we recommend installing an additional heating element
(available as an accessory).
In cooling operation, the heat pump is suitable for temperatures
ranging from +15 °C to +40 °C.
It can be used for silent and dynamic cooling. Minimum water
temperature +7 °C.
ATTENTION!
The device is not suitable for operation with a frequency converter.
2.2 Operating Principle
Heating
Surrounding air is drawn in by the ventilator and fed via the evap-
orator (heat exchanger). The evaporator cools the air, i.e. it 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 increasing
its pressure with the aid of an electrically driven compressor. It is
then transferred to the heating water using the liquifier (heat ex-
changer).
Domestic water can be prepared simultaneously, or separately,
via the desuperheater connected in series.
Electrical energy is used to raise the temperature of the heat in
the environment to a higher level. Because 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 the main components
evaporator, ventilator and expansion valve, as well as the low-
noise compressor, desuperheater, liquifier and electrical control
system.
At low ambient temperatures, humidity accumulates on the evap-
orator in the form of frost reducing the transfer of heat. The evap-
orator is defrosted automatically by the heat pump as required.
Steam may be emitted from the air outlet depending on the at-
mospheric conditions.
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Cooling
The functions of the evaporator and the liquifier are reversed in
the "Cooling" operating mode.
The heating water transfers its heat to the refrigerant via the liq-
uifier which is now functioning as an evaporator. The refrigerant
is pumped to a higher temperature level using the compressor.
Heat is passed on to the surrounding air via the liquifier (function-
ing as an evaporator in heating operation).
The waste heat can be used also for hot water consumers, such
as domestic hot water, swimming pool or bathroom heating, via
the additional heat exchanger.
3
Scope of Delivery
3.1 Basic Device
The heat pump is of compact design and is supplied complete
with the components listed below.
The refrigerant circuit is hermetically sealed. It contains the
Kyoto protocol approved refrigerant R404A with a GWP value of
3260. It is CFC-free, does not deplete ozone and is non-flamma-
ble.
1)
Evaporator (heating operation)
2)
Ventilator
3)
Switch box
4)
Pressure switches
5)
Liquifier (heating operation)
6)
Compressor
3.2 Switch Box
The switch box is located in the heat pump. It can be swung out
after removing the lower front cover and loosening the fastening
screw located in the upper right-hand corner.
The switch box contains the supply connection terminals as well
the power contactors and the soft starter unit.
The plug connector for the control line is located on the base of
the device adjacent to the cable gland in the base plate.
3.2
EN-3
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