3.1 Product description
Low temperature oil/gas boiler
Three-pass boiler with multi-layered convection heating surfaces
For operation with a modulating boiler water temperature
Permissible flow temperature (= safety temperature) up to 110 ºC (up
to 120 °C on request)
Permissible operating pressure 4 bar
■ CE designation: CE-0085BT0478
– according to Efficiency Directive 92/42/EEC (up to 390 kW)
– according to Gas Appliances Directive 2009/142/EC
■ Multi-layered convection heating surfaces for high operational relia-
bility and a long service life.
■ Standard seasonal efficiency [to DIN] for operation with fuel oil:
90 % (H
s
)/96 % (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.
■ The integral Therm-Control start-up system replaces the shunt pump
or constant raising of the return temperature, thereby saving instal-
lation time and costs.
■ 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.
3.2 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)
*1
None
*2
3. Low-end boiler water temperature – Oil operation 40 °C – Oil operation 50 °C
– Gas operation 50 °C – Gas operation 60 °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.
*1
For a corresponding sample application using the Therm-Control start-up system, see technical guide sample applications.
*2
No requirements only in conjunction with Therm-Control.
Vitoplex 300, type TX3A, 90 to 500 kW
OIL/GAS BOILERS
VIESMANN
7
5822 426 GB
3
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