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Vitodens 200-W, B2HB 19 to 35 Technical Data
Standard Equipment
Standard Equipment
The Vitodens 200-W gas-fired condensing boiler with
Inox-Radial heat exchanger, modulating MatriX cylinder
burner for liquid propane gas and natural gas (available
on all models), comes standard with:
■
pressure gage
■
installation fittings with 30 psig pressure
relief valve and air vent
■
thermometer guage (field installation on supply pipe)
■
LLH immersion sensor (if LLH is used)
■
DHW sensor
■
boiler control unit with outdoor
temperature sensor
- The boiler comes prewired and fully piped
internally for field connections and prewired.
- Side wall co-axial vent installations must include
Viessmann protective screen!
- Enclosure finish:
black steel, powder-coated white
- The Vitodens 200-W comes ready for use
with natural gas and can be fuel
converted to liquid propane gas in the field.
- Air vent
Wall mounting componentry
The following wall mounting components are supplied
with the Vitodens 200-W boiler:
■
Mounting bracket
■
Mounting bolts
■
Installation fittings
■
Screws for mounting bracket on
- wood studs (2” x 4”)
- metal studs
- brick/concrete wall
Combustion Management System
The combustion management system utilizes the physical
correlation between the level of the ionization current
and the air factor
λ
. For all gas qualities, the maximum
ionization current results with air factor
λ
.
The ionization signal is evaluated by the combustion
management system, and the air factor is adjusted to
between
λ
=1.24 and 1.44. This range provides for an
optimum combustion quality. Thereafter, the electronic
gas valve regulates the required gas volume based on the
prevailing gas quality.
To check the combustion quality, the CO
2
content or the
O2 content of the flue gas is measured. The actual values
enable the prevailing air factor to be determined.
The relationship between the CO
2
or O2 content and
air factor
λ
is illustrated in the table below.
To achieve an optimum combustion control, the system
regularly performs an automatic self-calibration; also after
a power failure (shutdown). For this, the combustion is
briefly regulated to max. ionization current (equals air factor
λ
=1). The automatic calibration is performed shortly after
the burner starts and lasts approximately 5 seconds. During
the calibration, higher than normal CO emissions may occur
briefly.
The Vitodens 200-W, B2HB boilers come equipped with Lambda Pro, the industry’s first intelligent combustion
management system. The boiler adjusts automatically to any gas type and quality without the need for a fuel
conversion kit.
Air factor
λ
- CO
2
/O2 content
Air factor
λ
O2 content (%)
CO
2
content (%) for natural gas
CO
2
content (%) for liquid propane gas
1.20
3.8
9.6
11.3
1.24
4.4
9.2
10.9
1.27
4.9
9.0
10.6
1.30
5.3
8.7
10.3
1.34
5.7
8.5
10.0
1.37
6.1
8.3
9.8
1.40
6.5
8.1
9.6
1.44
6.9
7.8
9.3
1.48
7.3
7.6
9.0
