Siemens LMV50 Series Manual page 294

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Building Technologies
Only LMV52.4:
Examples of tables showing the damper positions with flue gas recirculation
(FGR)
Table with setting values:
Output
Flue gas recirculation (FGR) curve
Flue gas recirculation (FGR)
temperature
The LMV52.4 uses these setting values to calculate a zero curve:
Example of flue gas recirculation (FGR) positions calculated by the LMV52.4 for a flue
gas recirculation (FGR) factor of 100%:
Position flue gas recirculation with
T = 0 °C zero curve
Example of flue gas recirculation (FGR) positions calculated from the identical setting
values for a flue gas recirculation (FGR) factor of 50%:
Position flue gas recirculation with
T = 0 °C zero curve
The above example shows that – with the zero curve – a flue gas recirculation (FGR)
factor of 50% leads to a 50% reduction of the damper positions.
The LMV52.4 performs a linear interpolation of the damper positions between the
setting values and the zero curve, depending on the current flue gas temperature.
When the flue gas temperatures lie above the setting values, the calculated damper
positions are higher than the setting values.
Basic Documentation LMV5...
20 Flue gas recirculation (FGR) function (LMV50/LMV51.3/LMV52)
37.5% 62.5%
19.3° 25.0°
72 °C 105 °C 121 °C
15.2° 18.0°
7.6° 9.0°
75% 100%
28.5° 37.0°
150 °C
19.7° 23.8°
9.8° 11.9°
CC1P7550en
22.05.2018