Glossary
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Operating instructions ecoTEC plus 0020116701_00
12
12 Glossary
Air/flue gas duct
The air/flue gas duct consists of all components that route
combustion air to the boiler or exhaust gas from the boiler.
Burner
The burner on a gas-fired condensing boiler is the compo-
nent on whose surface the gas/air mix is control-burnt.
Calorific value
Unlike the heating value, the calorific value of a fuel
describes the total useable heat during combustion, based
on the quantity of fuel used, including the condensation
heat in the steam. Condensing boilers use this additional
condensation heat to achieve much higher efficiency levels
than conventional boilers.
Controller
The controller is the interface to the boiler and can be used
to adjust the room temperature, hot water temperature,
heating times or night-time temperature reduction.
A distinction is made between room thermostat, weather
compensator and solar controller.
Cylinder charging
Cylinder charging mode refers to the process for heating up
the cylinder.
See also hot water generation.
eBUS
The abbreviation eBUS is short for energyBUS.
The eBUS is a special cable system used in the heating
technology field, which is used for communication between
the heating technology components (e.g. controller, boiler,
vrnetDIALOG).
Frost protection
The frost protection function protects your heating system
and dwelling from frost damage. If the heating flow temper-
ature falls below 5 °C when the on/off switch is on, the
boiler comes into operation and heats the heat generation
circuit to approx. 30 °C.
Heating flow temperature
Your boiler heats water which is pumped through your
heating system. The temperature of this hot water as it
leaves the boiler is referred to as the heating flow tempera-
ture.
Hot water production in VU boilers
Your boiler heats the water in the domestic hot water cylin-
der to the selected target temperature. If the temperature
in the domestic hot water cylinder falls by a specific
amount, the water is heated up again to the target temper-
ature.
Hot water production in VUW boilers
In the VUW boiler, the water is heated directly in the
through-flow principle.
Comfort mode immediately supplies you with hot water at
the required temperature, without you having to wait for
the water to heat up. In order to do this, the hot water heat
exchanger is kept at a preselected temperature level.
Legionella
Legionella are water-borne bacteria which can quickly prop-
agate and cause serious lung diseases. Legionella bacteria
occur wherever heated water provides the optimum condi-
tions for multiplication. Temporarily heating the water to
above 60 °C kills off the legionella.
Room thermostat
A room thermostat continuously measures the room tem-
perature and compares it with the room temperature you
have set (target room temperature). This allows the heating
system to maintain a constant set temperature in your
room.
In addition, you can enter individual heating times. The tar-
get room temperature and the heating times set by you
control the operation of your boiler, the power of which is
adapted automatically to the respective heat demand.
Weather compensator
A weather compensator is a controller that controls the
heating flow temperature of the heating system as a func-
tion of the measured outside temperature.
On the weather compensator you can also enter individual
heating times. The outside temperatures measured and the
heating times set control the operation of the burner, the
output of which is adjusted automatically to the respective
heat demand.
