6.1 Product description
Low temperature oil/gas boiler
Three-pass boiler as cast iron sectional design (available as a block
or in individual sections)
For operation with modulating boiler water temperature
Permissible flow temperature (= safety temperature) up to 110 °C
Permissible operating pressure 6 bar
■ CE designation: CE-0085BS0005
– according to the Efficiency Directive 92/42/EEC
– 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:
88 % (H
s
)/94 % (H
i
).
■ Standard seasonal efficiency [to DIN] improved by up to 12 % due
to condensing technology with stainless steel flue gas/water heat
exchanger Vitotrans 300.
■ Three-pass boiler, enabling clean combustion with low emissions.
■ Eutectoplex heating surface for high operational reliability and a long
service life. The homogeneous structure of the special eutectic cast
iron provides an even thermal transfer and prevents stress fractures.
■ Integral Therm-Control start-up system for easy hydraulic connec-
tions – a shunt pump and a return temperature raising facility are not
required.
■ Fastfix assembly system for rapid and simple installation.
■ Fast and straightforward assembly of individual cast iron sections
through tongue & groove system with resilient seal for permanent
hot gas tightness.
■ Economical and safe operation of the heating system through the
digital Vitotronic control system with communication capability.
Standardised LON BUS for complete integration into building man-
agement systems.
6.2 Operating conditions with Vitotronic boiler control units and Therm-Control
Requirements
Operation with burner load
≥ 60 %
< 60 %
1. Heating water flow rate None
2. Boiler return temperature (minimum value)
*3
None
*2
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.
*2
No requirements only in conjunction with Therm-Control.
Vitorond 200, type VD2A, 125 to 270 kW
10
VIESMANN
OIL/GAS BOILERS
6
5822 426 GB
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