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Key
Building Technologies Division
Burner output
This function is suited for use with single-boiler plants and cascaded systems, with or
without pressureless header.
With this function, the speed of the boiler pump is directly dependent on the burner's
current output. When the burner operates at low output, the boiler pump is controlled at
low speed, when the output is high, the boiler pump is controlled at high speed.
The speed of the boiler pump is calculated based on the burner's current output. As
long as the burner's output does not exceed the parameterized threshold (Output at
pump speed min (2334)), the boiler pump is parameterized at minimum speed. When
the burner's output exceeds the parameterized threshold, the pump's speed is raised
as the burner's output increases until, at the upper threshold (Output at pump speed
max (2335)), the pump is parameterized at maximum speed. If the burner's output
increases further, the pump's speed is maintained at its maximum.
Pump-PWM
PWM-max
PWM-min
Figure 41: Pump speed as a function of burner output
Line no.
Operating line
2334
2335
PWM-min
PWM-max
User Manual LMS14...
6 The settings in detail
7471d72e/0811
2334
Output at pump speed minimum
Output at pump speed maximum
Parameterized minimum speed of boiler pump
Parameterized maximum speed of boiler pump
Burner output
2335
CC1U7471en
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07.05.2014
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