Reset Integral Of Burner Stage 2; Temperature-Time Integral - Siemens RVA63.280 Basic Documentation

Benefit
Description
Setting
Effect
Burner stage 2
Note
Switching point
Example
Siemens Building Technologies
Landis & Staefa Division
3.6

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
0...500
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.
3.6.1

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.
°C
TKx
52
50
48
46
44
b reset limit
TKw Boiler temperature setpoint
TKx Actual value of boiler temperature
SDK Switching differential of boiler
t Time
tR Time to reset
Basic Dokumentation RVA63.280, RVA53.280
Unit
°C (K) min
b
tR
Factory setting
10
TKw+SDK/2
TKw
TKw-SDK/2
t
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CE1P2374E
19.04.2001