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18 Glossary
Air/flue gas duct
An air/flue gas duct is a line system with two separate flow
channels. The flue gas is routed into separate chambers at
the same time as the required combustion air is pumped to
the boiler. The air/flue gas duct can be designed as a con-
centric or adjacent double flue gas pipe (the flue gas chan-
nel is sealed from the air channel). Floor-standing boilers
and gas-fired wall-hung boilers can be operated as room-
sealed through the air/flue gas duct. As a result, boilers can
be installed in new buildings that do not offer sufficient
combustion air for open-flued heaters due to their airtight
construction.
Burner anti-cycling time
The burner is electronically locked for a specific time after
each time it is switched off ("restart interlock") to avoid fre-
quent switching on and off of the burner (energy losses)
and to extend the working life of the boiler.
The burner anti-cycling time is only activated for the heat-
ing mode.
Hot water handling is not affected if burner anti-cycling
time is running.
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.
The energy contained in steam can also be used if the
steam liquefies on cooling.
Compact thermal module
The compact thermal module is an assembly of Vaillant
condensing units that consists of the following five main
components in the ecoTEC plus: speed-regulated fan, gas
valve including support plate, Venturi including gas supply
pipe, burner door and premix burner.
Condensing technology
Technology which maximises the use of the calorific value
of the fuel. The flue gas is cooled until the water vapour
that it contains condenses. The condensation heat that this
releases can also be used.
In particular, the flue gas losses are greatly reduced. The
losses from conduction of heat and radiation are also
reduced by the lower system temperatures. The entire heat-
ing installation should therefore be designed for low system
temperatures (flow/return temperature) for the effective
use of the calorific value. The level of efficiency attainable
for boilers is always given based on the heating value of the
gas. Due to the additional condensation heat used, the cal-
culated values can exceed 100%.
Installation and maintenance instructions ecoTEC plus 0020134833_01
Digital information and analysis system (DIA)
The Vaillant ecoTEC plus boiler is fitted with a digital infor-
mation and analysis system (DIA). If additional settings are
required, which have not been configured using the installa-
tion assistant, you can view and modify further parameters
using the DIA.
eBUS
eBUS is an abbreviation for energyBUS. The eBUS is a spe-
cial bus used in heating technology, which assists the com-
munication between intelligent components in the heating
technology. In a Vaillant system, up to eight different heat-
ers can be connected via the eBUS.
The eBUS communications protocol simplifies the control-
related linking of different system components within a
heating installation. It provides particular flexibility for ret-
rofitting and expanding the system. This simplifies the
installation of boiler cascades or the subsequent addition of
components such as solar hot water generation.
The eBUS provides extended facilities for connecting con-
trollers.
Multi-functional module
The multi-functional module is an accessory that controls
additional functions or components in combination with
Vaillant boilers with eBUS electronics. It also allows you to
select and control 2 in 7 functions, e.g. circulation pump,
external heating pump, external solenoid valve or response
from the flue non-return flap.
Glossary
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