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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of heating engineer settings 26.03.2001
4.61 Reset integral of boiler
sequence
Optimum switching off of the heat sources in cascaded systems.
Setting the amount of surplus heat required for switching off a heat source.
Setting range Unit Factory setting
0...500 °C (K) min 50
The setting will change the switch off behaviour of the heat sources.
Increase: Heat source will be locked when surplus heat is greater
Decrease: Heat source will be locked when surplus heat is smaller
When, with the amount of heat currently generated, the required energy is exceeded by
the reset integral set here, the master will switch off one of the heat sources.
4.61.1 Temperature-time integral
The temperature-time integral is a continuous summation of the temperature differential
over time. In this case, the decisive criterion is the cascade flow temperature being
exceeded TVKx-(TKw+SDK/2).
Through the generation of the temperature-time integral it is not only the period of time
that is considered, but also the extent of overshoot. This means that when the crossing
is significant, the second heat source will be locked earlier.
When the release integral (area "b“ in the diagram below) has reached the value set
(point in time tR), the second heat source will be locked.
50
48
52
TVKx
2371Z35
°C
44
46
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