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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 of heating water. It can be used in newly built or previously
existing heating systems.
The heat pump is suitable for mono energy and bivalent opera-
tion 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).
NOTE
The device is not suitable for operation with a frequency converter.
2.2 Operating Principle
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 the electrically driven compressors. It
is then transferred to the heating water using the liquifier (heat
exchanger).
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 compressors, 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. Uneven
accumulation during this process does not indicate a fault. The
evaporator is defrosted automatically by the heat pump as re-
quired. Steam may be emitted from the air outlet depending on
the atmospheric conditions.
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3
Scope of Delivery
3.1 Basic Device
The heat pump contains the components listed below.
The refrigerant circuit is hermetically sealed. It contains the
Kyoto protocol approved refrigerant R410A with a GWP value of
1975. It is CFC-free, does not deplete ozone and is non-flamma-
ble..
1)
Evaporator
2)
Ventilator
3)
Switch box
4)
Filter dryer
5)
Liquifier
6)
Expansion valve
7)
Compressor
452161.66.04 · FD 9303
LI 20TES - LI 28TES
EN-3
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