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How the Vitodens 200 boiler operates... /
Installation Examples
How the Vitodens 200 boiler operates...
The MatriX burner blower and the
combination gas valve are factory calibrated
and pre-adjusted for optimum boiler
performance at all firing rates through a
non-mechanical, pneumatic modulating link
between combustion air and gas flows.
Blower speed is automatically increased or
decreased based on heat demand and
venting system resistances, thereby
regulating the amount of combustion air
drawn. The pneumatic modulating link
between air and gas introduces the required
amount of gas for correct combustion to
meet the current heat demand, based on a
linear relationship between ∆ P air and ∆ P
gas. The optimum combustion air flow rate
is recognized and monitored by the
differential air pressure sensor (transducer).
The output voltage signal of the transducer
is analyzed for logic by the LGM 29 burner
control unit. The LGM 29 burner control unit
contains pre-programmed performance
curves and operational safety parameters
unique for every boiler model.
Installation Examples
IMPORTANT
The examples on the following pages depict
possible piping layouts of the Vitodens 200
boiler equipped with Viessmann System
Technology.
For boiler and tank combinations, please
install only feasible combinations listed in
the Viessmann Price List.
Please note that the following examples are
simplified conceptual drawings only!
Piping and necessary componentry must be
field verified.
A low water cut-off (LWCO) must be
installed where required by local codes.
Proper installation and functionality in the
field is the responsibility of the heating
contractor.
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Flue gas adaptation function
The Vitodens 200 has a flue gas adaptation
function. This function records, processes,
and reacts in real time to fluctuations in
pressure drop in the vent air-intake pipe
during normal operation caused by partial
pipe blockages due to ice formation at the
vent termination, debris and/or sudden high
winds. Such increase in pressure drop, if
not promptly corrected, will reduce the
combustion air flow rate, and hence lead to
unstable combustion. The differential air
pressure sensor (transducer) records such
pressure drops and supplies voltage signals
to the LGM 29 burner control unit which, in
turn (based on stored performance curves
and safety parameters), initiates prompt
adjustment of the blower rotational speed,
thus readjusting the combustion air flow
rate for optimum combustion. The same
automatic adaptation logic applies if
combustion air is reduced (or increased) due
to slower (or faster) blower speed resulting
from line voltage drops (or increases) below
(or above) the threshold of 85% (or 110%).
WARNING
If a DHW storage tank other than a
Viessmann Vitocell 100 or 300 tank is
used, the installer must verify proper
operation of the Viessmann DHW tank
temperature sensor with the original
manufacturer of the tank. Viessmann
strongly recommends the installation of a
temperature tempering valve in the DHW
supply line.
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