9 x Glossary
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BA ROTEX HPSU compact 2 - 04/2011
9 Glossary
Anti-legionella system Periodic heating of storage water to >71 °C for preventative elimination of pathogenic bacteria in the hot water circuit
(so-called legionella).
Booster, backup heater Electrical heater used to support heat generation by heat exchanger.
Bottom plate heater Bottom plate heater for the external heat pump unit.
Control unit Operating unit in the front area of the heat generator, which comprises main switch, fault indicators. water pressure
gauge as well as program selection keys, rotary knobs and display.
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.
Low tariff mains connection 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.).
Modulation Automatic and continuous adjustment of the heat output to the heat requirement at the time, without having to switch
various heat stages or cycles.
Nominal output Maximum heat output, which the heat generator emits at certain operating temperatures.
Operating mode Function of the heat exchanger requested by the user or control unit (e.g. room heating, hot water heating, room cooling,
standby 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 from the radiators in the rooms back to the heat generator via
the piping system.
Switching time programme Times which you can set on the operating unit to define regular heating, economy and hot water phases.
Water shortage/ overheating
protection
Safety device which switches the boiler off automatically in the event of a water shortage to prevent overheating.
Weather-dependent set value
regulation
The suitable flow temperature is calculated from the mesaured value for the external temperature and a defined heating
curve; this temperature serves as the target value for temperature control in the heating unit.
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