Glossary
Operating instructions ecoTEC plus 0020134822_01
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10
10 Glossary
Air/flue gas duct
The air/flue gas duct consists of all components that route
combustion air to the boiler or flue gas away 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 usable 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 considerably higher efficiency
levels than conventional boilers.
Controller
The controller is the interface to the boiler, by means of
which you can adjust, for example, the room temperature,
the hot water temperature, the heating times or the night
set-back phase in accordance with your requirements and
wishes.
A distinction is made between room thermostat, weather
compensator and solar control.
Cylinder charging
Cylinder charging mode refers to the process of heating up
the cylinder. See also hot water generation.
Dew point
The dew point is the temperature at which steam turns to
liquid (condensation). The steam in the flue gas from the
boiler contains thermal energy, which can be released by
condensation. In gas-fired and oil-fired boilers using calo-
rific values, the flue gases are cooled so that the steam
condenses and the heat that it contains can be output into
the heating system.
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 installa-
tion and dwelling from frost damage. If the heating flow
temperature falls below 5 °C when the on/off switch is on,
the boiler comes into operation and heats the circulating
water to 30 °C.
Heating flow temperature
Your boiler heats water which is pumped through your
heating installation. The temperature of this hot water as it
leaves the boiler is referred to as the heating flow tempera-
ture.
Hot water generation
Your boiler heats the water in the domestic hot water cylin-
der to the selected target temperature. If the temperature
in the DHW cylinder falls by a specific amount, the water is
heated up again to the target temperature.
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 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
installation 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.
vrnetDIALOG Internet communication system
-vrnetDIALOG is a service connection to the Internet. Using
vrnetDIALOG, your competent person can set the heating
installation in your house from your PC. Fault diagnosis can
also be carried out remotely via the integrated DIA system.
-vrnetDIALOG can also forward fault messages by fax,
e-mail or SMS to your competent person. This allows the
competent person to prepare in advance of carrying out
any work, if a repair is required, and to arrive with the right
spare parts on the service date.
If necessary, your competent person can also carry out
adjustments on the controller or boiler via vrnetDIALOG to
save unnecessary visits.
Weather compensator:
A weather compensator is a controller that controls the
heating flow temperature of the heating installation,
depending on the measured outside temperature.
With the weather compensator, you can also enter individ-
ual heating times. The outside temperatures that are meas-
ured and the heating times that are set control the opera-
tion of the burner, the output of which is adjusted automati-
cally to the relevant heat demand.
