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Glossary
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BA ROTEX A1 BO - 10/2007
8
Glossary
Additional water
The volume which needs to be added to compensate for water losses.
Air/flue system (LAS)
System comprising the flue gas and air intake pipes which cools the flue gas and heats the intake air in a counterflow
principle. On the one hand the heat of condensation from the flue gas is used. On the other hand the flue gas heats up the
combustion air that is drawn in. Both factors increase the efficacy of the installation.
Ambient air dependent
operation
Operating mode of the installation whereby the boiler draws the air required for combustion from the installation room.
Automatic firing unit
The system that starts and controls the oil burner, that monitors the combustion process and switches the oil burner off in
the event of a malfunction.
Boiler control panel
Operating panel on the front area of the boiler which contains the main switch, the warning lamps, the water pressure
gauge and the programme selection buttons, the rotary switches and the display.
Burner setting
Settings on the oil burner which can only be carried out by engineers, for example setting the oil-air mixture,
the burner output and the electrodes.
Calorific value
Energy created by combustion of the fuel and from condensation of the flue gas which is produced as heat and which can
be used (synonym = gross calorific value)
Condensate
preparation unit
Unit for cleaning and neutralising the condensation product created when the combustion gases cool down (strongly acidic).
Condensing
technology
Heating technology which uses, in addition to the sensitive combustion energy (calorific value), the heat of condensation
of the flue gas, thus increasing the efficiency of the system.
Control
Electronic operating and control unit for controlling the burner, valve and pump, with which the thermal conditions of the
heating system are determined and monitored.
Control measurement
An analysis of the flue gas is carried out at a defined operating condition of the boiler in order to monitor the quality of
combustion. There is an automatic programme integrated in the control for this purpose.
Energy saving
directive (ENEV)
Legal directive which defines the standards of construction and heating technology and which evaluates the efficiency of
the heating and hot water preparation system.
Filling water
Volume of water which must be poured into the heating system before initial start-up.
Flue gas mass flow
Volume of flue gas produced during combustion and directed to the open air via the flue system, depending upon the set
burner output.
Heat of condensation
Energy created by the condensation of the water vapour in the cooling flue gas and which is used to generate heat in
condensation technology.
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.
Heating circuit
Circuit of heated water from the boiler to the radiators and back.
Heating return
Part of the heating circuit that directs the cooled water from the radiators in the rooms back to the boiler via the piping
system.
Heating return flow
Part of the heating circuit that directs the heated water from the boiler to the radiators in the rooms.
Nominal output
Maximum heating output which the boiler produces at specific operating temperatures.
Operation independent
of ambient air
Operating mode of the installation where the boiler does not draw the air required for combustion from the installation room,
but from outside via the air-flue gas system. ROTEX recommends this method of operation.
Timer programme
Time settings that are entered in the control to specify regular heating, setback 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.
