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2
Purpose of the Heat
Pump
2.1 Application
The high-temperature air-to-water heat pump is to be used exclu-
sively for the heating of heating water. It can be used for retrofit-
ting existing heating systems when flow temperatures up to
75 °C are required.
The heat pump is suitable for mono energy and bivalent opera-
tion 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.
2.2 Operating Principle
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 a
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. 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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3
Scope of Delivery
3.1 Basic Device
The heat pump is of compact design and is supplied complete
with the components listed below.
Both refrigerating circuits are "hermetically sealed" and contain
the Kyoto protocol approved fluorinated refrigerants R404A and
R134a with a GWP value of 3260 and 1300 respectively. They
are CFC-free, non-ozone depleting and are non-combustible.
1)
Evaporator
2)
Check valve
3)
Ventilator
4)
Switch box
5)
Pressure switches
6)
Liquifier
7)
Filter dryer
8)
R404A compressor
9)
R134a compressor
3.1
E-3
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