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Glossary
FA ROTEX RoCon mb • 09/2017
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Glossary
Operating mode
Heat generator function requested by the user or the controller (e.g. room heating, hot water prepa-
ration, Stand-by, etc.)
Backup requirement
Operating situation in which the required feed temperature cannot be reached efficiently or at all using
the heat pump process. A heater booster (e.g. a backup heater) is therefore integrated to support the
ROTEX HPSU monobloc compact in generating heat.
Backup heater
Optional electric heater booster for general support of the ROTEX HPSU monobloc compact during
heat generation.
Heating characteristic curve Mathematical relationship between the external temperature and the target T-HS (synonym = heat
slope) in order to achieve the desired room temperature at all outside temperatures.
Refrigerant
A substance used for heat transfer in the heat pump process. At low temperature and low pressure,
heat is absorbed and at high temperature and a high pressure, heat is emitted.
Anti-legionella system
Periodic heating of the storage tank water to >60 °C to preventively kill pathogenic bacteria (Legionella)
in the hot water circuit.
Modulation
Automatic and stepless adjustment of the heating performance/pump performance to the respective
heating requirement, without different heating/pump steps or cycles having to be switched.
Off-peak mains connection
(HT/NT)
A special mains connection to the energy supplier, which offers various cheaper rates during so-called
low-load periods for electrical current (day-, night-, heat pump current, etc.).
Nominal output
Maximum heating performance, which the heat generator provides under test conditions for certain op-
erating temperatures.
Parameters
A value that influences the execution of programs or processes or defines specific states.
Control unit
Device electronics that are used to control the processes for heat generation and heat distribution for
the heating system. The control unit consists of a number of electronic components. The most im-
portant component for the operator is the control panel in the front area of the heat generator; it in-
cludes controls (rotary switches, rotary buttons, Exit button) and a display.
Return flow
Part of the hydraulic circuit that directs the cooled water from the radiators in the rooms back to the
heat generator via the piping system.
Switching time program
Setting of weekdays and times on the controller to define regular heating, cooling, economy and hot
water cycles.
Smart Grid (SG)
Intelligent use of energy for inexpensive heating. By using a special electricity meter, it is possible to
receive a "Smart Grid signal" from the utility company.
Depending on the signal, the heat pump is shut off, or operated as normal or at higher temperatures.
Flow
Part of the hydraulic circuit that diverts the heated water from the heat generator to the heating sur-
faces.
Domestic hot water circuit
The water circuit in which cold water is heated and conducted to the hot water tap.
Domestic hot water gener-
ation
Operating status of the heat generator in which heat with elevated temperatures is generated and fed
to the hot water circuit, e.g. loading of the hot water storage tank.
Heat pump process
In a closed-loop refrigerant circuit, the refrigerant absorbs the heat from the ambient air. By means of
compression, the refrigerant achieves a higher temperature which is transferred to the heating system
(thermodynamic cycle).
Heat exchanger
A component that transfers thermal energy from one circuit to another. The two circuits are separated
from each other hydraulically by a wall in the heat exchanger.
Water shortage/Overheating
protection
Safety facility that shuts off the heat generator automatically in the event of a water shortage to prevent
overheating.
Weather-dependent T-HS
control
Target feed temperature determined from the measured value for the outside temperature and a de-
fined heating curve for temperature control in the heater.
Circulation pump
Optional circulation pump that circulates the hot water in the circulation circuit (return from the tapping
point to the hot water storage tank), thus making it available immediately at each tapping point. This
circulation is especially useful in extensively branching pipe networks. In hot water distribution net-
works without circulation, the cooled water in the removal line first emerges during the tapping process
until the removal line has been heated sufficiently by the inflowing hot water.
Heater booster
Additional heat generator (e.g. backup heater or external boiler) integrated in the heating system to
achieve the required target feed temperature in the case of an inadequate or inefficient heat pump
process.
