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2 Purpose of the Heat
Pump
2.1 Application
The air-to-water heat pump is designed for use in existing or
newly built heating systems.
It is designed exclusively for heating and cooling heating water!
In heating operation, the heat pump is suitable for mono energy
and bivalent operation down to an external temperature of -
20 °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. The minimum
water temperature is +7 °C.
ATTENTION!
The device is not suitable for operation with a frequency converter.
2.2 Operating Principle
Heating
Outside air is drawn in by the ventilator and fed via the evapora-
tor (heat exchanger). The evaporator cools the air, i.e. it extracts
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).
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, 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.
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 compressor
raises the temperature level of the refrigerant and the heat is
passed on to the surrounding air via the liquifier (functioning as
an evaporator in heating operation).
3 Scope of Delivery
3.1 Basic Device
The compact heat pump is supplied complete with all of the im-
portant components of the heating circulation system:
Expansion vessel
Heat circulating pump
Overflow valve and safety components (pressure relief
valve, pressure gauge)
R404A is used as the refrigerant.
1) Evaporator (heating operation)
2) Ventilator
3) 24 l expansion vessel
4) Switch box
5) Liquifier (heating operation)
6) Compressor
7) Overflow valve
8) Heat circulating pump
9) Buffer tank
10) Filter dryer
11) Inspection window
12) Expansion valve