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Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
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
2334
233
Burner output
7471d72e/0811
Figure 41: Pump speed as a function of burner output
Key
Line no. Operating line
2334 Output at pump speed minimum
2335 Output at pump speed maximum
PWM-min Parameterized minimum speed of boiler pump
PWM-max Parameterized maximum speed of boiler pump
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