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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of OEM settings 26.03.2001
5.6 Reset integral of burner stage 2
Optimum switching off of burner stage 2.
Adjustment of the amount of surplus heat for locking burner stage 2.
Setting range Unit Factory setting
0...500 °C (K) min 10
The setting will change the switch-off behaviour of burner stage 2.
Entry:
Increase: Burner stage 2 will be locked when surplus heat is greater
Decrease: Burner stage 2 will be locked when surplus heat is smaller
If, with burner stages 1 and 2, the switch-off setpoint (TKw + SDK/2) is exceeded by the
amount of the reset integral set here, the controller will lock burner stage 2.
When burner stage 2 is locked, the controller will activate and deactivate burner stage 1
according to the set switching differential.
5.6.1 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 difference by which the boiler
temperature exceeds the burner’s switch-off setpoint TKx- (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, burner stage 2 will be locked earlier.
When the release integral (area "b" in the diagram below) has reached the value set
(point in time tR), burner stage 2 will be locked.
50
48
52
TKx
2371Z34
°C
44
46
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