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7 Internal Burner Firing-rate Controller
Fig. 7-2 Startup sequence
7.12 Thermostat and Control Range
The thermostat function switches the burner on and off on the basis of the temperature and/
or pressure value, but only when burner is released by the start signal. The control range is
formed by entering the controller set-point value and the parameters P 802 (switch-on point),
P803 (upper control range) and P 804 (burner OFF). The cut-off hysteresis is divided into 2
ranges. The first part lies above the set-point and forms the upper control range. The second
part lies below the setpoint and forms the lower control range.
The control range may lie asymmetrically around the setpoint.
The power control unit functions within the upper and lower control range according to its set-
tings in the parameters and the default values.
If the actual value of the control unit reaches the shut-down range, the base load request is
emitted. If the control unit’s setpoint exceed the shut-down range a control shut-off occurs.
This is done by internal processing. If the actual value drops below the lower control range, a
re-start can occur.
No FMS ETA Short Text Description Min Max Default
791 0 0 Anf.Temp Max. start-up temperature 0 999 0
Maximum start-up temperature or pressure in relation to
the actual value

Start - up circuit parameter:

Enter the actual temperature, up to which the start - up
circuit is active.
792 0 0 Anf.Leis Start-up output 0 999 0
Burner start-up firing-rate, corresponding to the internal
firing-rate (in digit)

Set the firing-rate value at which the burner should start.

see figure start - up circuit
793 0 0 Anf.Zeit Start-up time 0
32767
0
Burner-start-up-time in seconds

The maximum time the start - up circuit is active is set
here.

see figure start - up circuit