Standard Equipment; Combustion Management System - Viessmann VITODENS 222-F Technical Data Manual

Standard Equipment/Management System

Standard Equipment

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
O2 content of the flue gas is measured. The actual values
enable the prevailing air factor to be determined. The
relationship between the CO
λ is illustrated in the table below.
Air factor λ - CO /O2 content
2
O2 content (%)
Air factor λ
1.20 3.8
1.24 4.4
1.27 4.9
1.30 5.3
1.34 5.7
1.37 6.1
1.40 6.5
1.44 6.9
1.48 7.3
The Vitodens 222-F, B2TA 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.
22
content or the
2
or O2 content and air factor
2
CO content (%) for natural gas
2
9.6
9.2
9.0
8.7
8.5
8.3
8.1
7.8
7.6
Vitodens 222-F, B2TA 19 and 35 Technical Data
The Vitodens 222-F gas-fired condensing combi-boiler
with Inox-Radial heat exchanger, modulating MatriX
cylinder burner for liquid propane gas and natural gas
(available on all models), comes standard with:
stainless steel DHW tank
■
pressure gage
■
relief valve and air vent and heat exchanger
■
bleeding valve
Integral diaphram expansion tank
■
■ boiler control unit with outdoor
temperature sensor, power/pump module:
- installation fittings with 30 psig pressure
- The boiler comes prewired and fully piped
internally for field connections and prewired.
- Venting material (coaxial) is to be supplied by
Viessmann only. Side wall vent installations
must include Viessmann protective screen!
- Enclosure finish:
black steel, powder-coated white
- The Vitodens 222-F comes ready for use
with natural gas and can be fuel
converted to liquid propane gas in the field.
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 combustion management system can also be
calibrated manually, e.g. after maintenance or service
work (coding address "85", see Service Instructions).
CO content (%) for liquid propane gas
2
11.3
10.9
10.6
10.3
10.0
9.8
9.6
9.3
9.0