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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.23.6 Boiler pump
The boiler pump is activated whenever the boiler is released or the burner is running.
Note!
The boiler pump can also be activated via the following functions:
Frost protection for the plant
Boiler protection
Chimney sweep (via release)/special operating modes
Forced signals (storage tank recooling)
To give consideration to special hydraulic configurations, assignment of the boiler pump
to heat requests can be changed. If the following parameter was set to On, a request
for heat from heating circuits 2 and 3 would not lead to an activation of the boiler pump.
Basics of boiler pump
Control of the boiler pump is performed based on the speed calculated for the DHW
pump (charging pump Q3 or instantaneous water heater pump Q34) for DHW mode, or
based on the highest speed calculated for the 3 heating circuit pumps for Heating mode
only. The calculated pump speed for heating circuits 2 and 3 is evaluated only if these
heating circuits also are hydraulically dependent on the position of the diverting valve
(parameters Ctrl boiler pump/DHW valve (5774)).
The speed of the boiler pump is fully adopted from the DHW or heating circuit pump.
Hence, only the PWM limits of the respective DHW or heating circuit pump are valid. In
that case, no consideration is given to the PWM limits of the boiler pump.
Note!
This function is only used in connection with single-boiler plants.
For cascaded systems, one of the other functions must be selected.
The function is selected via enumeration Demand of parameter Pump modulation
(2320).
Line no. Operating line
881 Starting speed
2320 Pump modulation
5101 Pump speed min
5530 Pump speed min
882 Pump speed min
5102 Pump speed max
5531 Pump speed max
885 Pump speed min OEM
5106 Pump speed min OEM
5535 Pump speed min OEM
886 Pump speed max OEM
5107 Pump speed max OEM
5536 Pump speed max OEM
Line no. Operating line
8308 Boiler pump speed
8310 Boiler temp
Speed according to DHW
pump/heating circuit
pumps
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