7.1 Product description
Low temperature oil/gas boiler
Three-pass boiler in individual cast iron sections
For operation with modulating boiler water temperature
Permissible flow temperature (= safety temperature) up to 110 ºC
Permissible operating pressure 6 bar
■ CE designation: CE-0085AS0002
– according to Efficiency Directive 92/42/EEC (up to 380 kW)
– 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
).
■ Improvement in the standard seasonal efficiency [to DIN] by utilising
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 homogenous structure of the special eutectic cast
iron ensures an even heat transfer and prevents stress fractures.
■ Fastfix assembly system for rapid and simple installation.
■ Easy installation even in tight spaces through sectional design and
low transport weight of individual sections.
■ Fast and straightforward assembly of individual cast iron sections
through double groove system and 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.
7.2 Operating conditions with Vitotronic boiler control units
Requirements
Operation with burner load
≥ 60 %
< 60 %
1. Heating water flow rate 30 % at rated output
2. Boiler return temperature (minimum value)
*3
– Oil operation 40 °C – Oil operation 53 °C
– Gas operation 53 °C – Gas operation 53 °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.
Vitorond 200, type VD2, 320 to 1080 kW
OIL/GAS BOILERS
VIESMANN
11
5822 426 GB
7
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