1 Control unit
2 PushupapupstreamofUSBconnection
(forqualiedpersonnelforsoftware
updates and for data logging)
3 Wall-mountedbracket(onlynecessary
for wall-mounted installation)
Underside of control unit
1
3 42
1 RBE (RS 485)
2 Networkcableconnection
3 LIN bus cable connection to the heat pump
4 not used
3.2 Accessories
The following accessories are available for the unit
through the manufacturer's local partner:
● Additional cover for the front cover panel, if the
control unit is mounted on the wall
● Room thermostat for switching the cooling function
(if available)
● Dew point monitor for protecting a system with
cooling function at low ow temperatures
● Expansion board for automatic changeover
between heating and cooling mode
● Manual output control heating element (MLRH) for
limiting the output of the electric heating element
● “Cooling package” for retrotting type H units with
a cooling function
3.3 Function
Liquid refrigerant is evaporated (evaporator), the
energy for this process is environmental heat and
comes from the “ground” heat source (collector,
borehole heat exchanger or groundwater via
intermediate exchanger). The gaseous refrigerant is
compressed (compressor), this causes the pressure
to rise and therefore the temperature too. The
gaseousrefrigerantwithhightemperatureisliqueed
(condenser).
Here the high temperature is discharged to the heating
water and is used in the heating circuit. The liquid
refrigerant with high pressure and high temperature
is expanded (expansion valve). The pressure and
temperature drop and the process begins again.
Due to the integrated changeover valve and the
integrated energy efciency circulation pump the
heated heating water can be used for charging the
domestic hot water or for heating the building. The
temperatures required and use are controlled by the
heat pump controller. Reheating, drying out screed or
increasing the domestic hot water temperature can
be carried out using the integrated electric heating
element, which is activated by the heat pump controller
as and when necessary.
An integrated overow valve ensures that the heat
pump does not switch to high-pressure fault if all
heating circuits are closed. The integrated vibration
isolators for the heating circuit and heat source prevent
structure-borne sound and vibrations from being
transferredontothexedpipesandthereforeintothe
building.
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