2.1 Product description
Low temperature oil/gas boiler
Three-pass boiler
For operation with modulating boiler water temperature
Permissible flow temperature (= safety temperature) up to 110 °C (up
to 120 °C on request)
Permissible operating pressure 6 bar
■ CE designation: CE-0085BQ0020
– according to Gas Appliances Directive 2009/142/EC
■ Economical and environmentally friendly through modulating boiler
water temperature.
Standard seasonal efficiency [to DIN] for operation with fuel oil:
89 % (H
s
)/95 % (H
i
).
■ Optional stainless steel flue gas/water heat exchanger for higher
standard seasonal efficiency [to DIN] through condensing technol-
ogy.
■ Three-pass boiler with low combustion chamber loading, resulting in
clean combustion with low emissions.
■ Wide water galleries and large water content provide excellent nat-
ural circulation and safe heat transfer.
■ Long burner runtimes and fewer cycle intervals, due to large water
content, protect the environment.
■ Compact design for easy transportation – important for modernisa-
tion projects.
■ Economical and safe operation of the heating system through the
digital Vitotronic control system with communication capability.
Standardised LON for complete integration into building manage-
ment systems.
2.2 Operating conditions with Vitotronic boiler control units
Requirements
Operation with burner load
≥ 60 %
< 60 %
1. Heating water flow rate None
2. Boiler return temperature (minimum value)
*3
– Oil operation 40 °C – Oil operation 53 °C
– Gas operation 53 °C – Gas operation 58 °C
3. Low-end boiler water temperature – Oil operation 50 °C – Oil operation 60 °C
– Gas operation 60 °C – Gas operation 65 °C
4. Two-stage burner operation Stage 1; 60 % of rated output No minimum load required
5. Modulating burner operation Between 60 and 100 % of rated output No minimum load required
6. Reduced mode Single boiler systems and lead boiler of multi-boiler systems
– Operation with the low-end boiler water temperature
Lag boilers of multi-boiler systems
– Can be shut down
7. Weekend setback As per reduced mode
Note
For water quality requirements, see page 44.
*3
For sample applications, see technical guide sample applications.
Vitoplex 200, type SX2A, 700 to 1950 kW
6
VIESMANN
OIL/GAS BOILERS
2
5822 426 GB
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