Flue gas monitoring sensor
Part no. 7266 023
Sensor for installation in draught hood with plug "CN2" for burner con-
trol unit.
If flue gas enters the installation room, the flue gas monitoring device
switches the burner off.
Design information
5.1 Selection of rated output
Select a boiler according to the required heat demand including DHW
heating.
The rated output for low temperature boilers, condensing boilers and
multi-boiler systems may be higher than the calculated heat demand
of the building in question.
The level of efficiency of low temperature boilers is consistent across
a wide boiler load range.
5.2 System design
The boiler water temperature is limited to 75 °C.
The boiler water temperature and the flow temperature can be raised
by adjusting the thermostat.
To minimise distribution losses, we recommend that you size the heat
distribution system and the DHW heating system for a max. flow tem-
perature of 70 °C.
5.3 Flue system
With draught in the flue gas system exceeding 10 Pa, we recommend
the installation of a Vitoair combined draught stabiliser (for chimney
installation) near the ceiling (see the separate datasheet in regis-
ter 9).
5.4 Safety equipment
Equip these boilers with a type-tested safety valve in accordance with
EN 12828 for hot water heating systems with a safety temperature of
up to 110 °C.
This must be identified in accordance with TRD 721 as follows:
■ "H" up to 3.0 bar permissible operating pressure and max.
2700 kW rated output
■ "D/G/H" for all other operating conditions.
5.5 Thermal safety shut-off valve
According to paragraph 4, section 5 of the FeuVo '96 [or local regula-
tions], thermally activated shut-off equipment must be installed in com-
bustion equipment or in gas lines immediately upstream of the com-
bustion equipment, which will shut off the gas supply, if the external
temperature exceeds 100 °C.
These valves must isolate the gas supply for at least 30 minutes up to
a temperature of 650 °C. This should prevent the formation of explo-
sive gas mixtures in the event of a fire.
5.6 Heating circuits
For heating systems with plastic pipes, we recommend the use of
impermeable pipes to prevent the diffusion of oxygen through the pipe
walls. Provide system separation in heating systems with plastic pipes
to DIN 4726 that are permeable to oxygen. We supply a separate heat
exchanger for this.
We recommend a return temperature raising facility for systems with
a water content > 15 l/kW.
Underfloor heating systems and heating circuits with very large water
content should be connected to the boiler via a three-way mixer; see
the technical guide on "Control of underfloor heating systems".
Install a temperature limiter into the flow of the underfloor heating cir-
cuit to limit the maximum temperature.
Observe the requirements of DIN 18560-2 [or local regulations].
5.7 Plastic pipework for radiators
We also recommend the installation of a temperature limiter to limit the
maximum temperature of plastic pipes in heating circuits with radia-
tors.
Installation accessories
(cont.)
VITOGAS
VIESMANN
45
5822 428 GB
5
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