Viessmann VITOPLEX 200 Type SX2A Technical Manual page 9

Vitoradial 300-T, type VR3, 101 to 335 kW
5.1 Product description
Low temperature boiler with oil/gas condensing heat exchanger
Three-pass boiler with multi-layered convection heating surfaces
and downstream Inox-Radial spiral heat exchanger
For operation with a modulating boiler water temperature
Permissible flow temperature (= safety temperature) up to 110 ºC
Permissible operating pressure 4 bar
■ CE designation: CE-0035BU104
– according to the Efficiency Directive 92/42/EEC
– according to Gas Appliances Directive 2009/142/EC
■ Oil Unit condensing boiler with Vitoflame 100 pressure-jet oil burner
or gas condensing system with on-site burner.
■ Standard seasonal efficiency [to DIN] for operation with fuel oil: 97
% (H )/103 % (H ).
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5.2 Operating conditions with Vitotronic boiler control units and Therm-Control
Operation with burner load
1. Heating water flow rate
2. Boiler return temperature (minimum value)
3. Low-end boiler water temperature
4. Two-stage burner operation
5. Modulating burner operation
6. Reduced mode
7. Weekend setback
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.
OIL/GAS BOILERS
■ Inox-Radial heat exchanger for condensing hot gases, matched to
the compact boiler.
■ Complete with heat exchanger pipework and pump, matched to the
respective boiler output.
■ Long burner runtimes and fewer cycle intervals, due to large water
content, protect the environment.
■ Economical and safe operation of heating systems through the dig-
ital Vitotronic control system with communication capability.
■ Integral Therm-Control start-up system for easy hydraulic connec-
tion – no shunt pump or return temperature raising facility are
required.
■ No low water indicator required, you save even more.
■ Compact design for easy transportation and low build height – impor-
tant for modernisation projects.
Requirements
≥ 60 %
None
*1 *2
None
– Oil operation 40 °C
– Gas operation 50 °C
Stage 1; 60 % of rated output
Between 60 and 100 % of rated output
The boiler can be switched OFF if no heat is required.
As per reduced mode
< 60 %
– Oil operation 50 °C
– Gas operation 60 °C
No minimum load required
No minimum load required
VIESMANN
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