Rotex HPSU compact 304, Instruction Manual

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9 x Glossary
BA ROTEX HPSU compact 4 - 09/2013
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9 Glossary
Anti-legionella system Periodic heating of storage water to > 60 °C for preventative elimination of pathogenic bacteria
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(so-called legionella) in the hot water circuit.
Backup function Operation for support of the HPSU compact during heat generation (by backup heater)
Backup heater Optional electric ancillary heater for general support of the HPSU compact during heat generation.
Circulation circuit Is an optional ancillary circuit in the hot water circuit which serves to ensure that hot water flows out of
the discharge point as soon as the tap is turned on. In this circuit the hot water circulates via a circu-
lation pump between the hot water storage tank and the draw-off point.
Circulation pump Is an additional electrical circulation pump which permanently recirculates the hot water in the hot water
pipes and thus provides it at each draw-off point without delay. Circulation is particularly effective in
widely branched piping networks. In systems without a circulation pipe, at first the water cooled in the
outlet pipe escapes during the tapping process until the outlet pipe is sufficiently heated by the hot
water flowing subsequently.
Control Device electronics, with which the processes for heat generation and heat distribution for the heating
system are controlled. The Solar tank with integrated interior heat pump unit consists of many elec-
tronic components. The component that is most important to the operator is the operating element to
the front of the heat generator, which has programme selection buttons, rotary push button and display.
Direct circuit Is the water circuit which is heated in an uncontrolled manner directly by the heat source.
Domestic hot water

generation
Operating status of the heat generator, in which heat is generated at increased temperatures and
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supplied to the hot water circuit, e.g. filling the hot water storage tank.
Flow Part of the hydraulic circuit which directs the heated water from heat generator to the heating surfaces.
Heat exchanger A part that transfers thermal energy from one circuit to another. Both circuits are separated from each
other hydraulically by a wall in the heat exchanger.
Heating characteristic curve Mathematical relationship between the external temperature and the target flow temperature (synonym
= heating curve), in order to achieve the desired room temperature at all outside temperatures.
Hot water circuit Is the water circuit in which the cold water is heated and directed to the hot water discharge point.
Low tariff 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.).
Mixing circuit Is a water circuit that flows through various different heating circuits (as required) in a controlled
manner.
Modulation Automatic and continuous adjustment of the thermal / pump output to the particular heat requirement,
without having to switch various heating / pumping stages or cycles.
Nominal output Maximum heat output given by the heat generator at certain operating temperatures under test condi-
tions.
Operating Mode User or Solar tank with integrated interior heat pump unit-demanded function of the heat generators
(e.g. room heating, hot water heating, stand-by, etc.)
Parameter A value that influences the execution of programs or processes or defines specific states.
Refrigerant A material which is used for thermal transfer in a coolant system. At low temperature and low pressure,
heat is absorbed and at high temperature and a high pressure, heat is emitted.
Return flow Part of the hydraulic circuit that directs the cooled water via the piping system from the radiators back
to the heat generator.
SMART GRID (SG) Intelligent energy utilisation for economical heating. Using a special electricity meter it is possible to
receive a "SMART GRID signal" from the energy supply company which, depending on the signal type,
moves the heat generator into the standby, normal or storage tank operating mode.
Storage tank charging circuit Is the water circuit which heats the water stored in the hot water storage tank (not to be confused with
the hot water circuit).
Switching time programme Programme for setting times at the Solar tank with integrated interior heat pump unit to define regular
heating, cooling, setback and hot water cycles.
Water shortage/ overheating
protection Safety device which switches the boiler off automatically in the event of a water shortage to prevent
overheating.
Weather-controlled flow

temperature regulation
The suitable flow temperature is calculated from the measured value for the external temperature and
a defined heating curve; this temperature serves as the target value for temperature control in the
heating unit.