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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
The LMS14... keeps controlling the boiler’s output by maintaining the boiler temperature
setpoint. Pump speed control ensures control of the boiler pump speed such that the
parameterized boiler temperature differential between boiler return and boiler flow is
maintained.
If the current boiler temperature increase exceeds the nominal differential, the pump
speed is increased or, otherwise, decreased.
The pump’s speed is limited by the parameterized minimum and maximum speeds.
In DHW heating mode, the boiler pump’s speed is not controlled to the parameterized
nominal boiler temperature increase. The speed of the boiler pump in DHW heating
mode is calculated based on the Demand function (see above).
For all other operating modes – with the exception of DHW heating mode – following
applies:
If the boiler return temperature is not available (sensor defective or not configured), or if
no valid boiler temperature increase is configured, the speed of the boiler pump is
calculated based on the Boiler temperature setpoint function.
The function is selected via enumeration Temp differential nominal of parameter Pump
modulation (2320).
Line no. Operating line
2317 Temp differential nominal
2320 Pump modulation
2322 Pump speed min
2323 Pump speed max
2324 Speed Xp
2325 Speed Tn
2326 Speed Tv
2327 Pump speed min OEM
2328 Pump speed max OEM
Line no. Operating line
8308 Boiler pump speed
8310 Boiler temp
8314 Boiler return temp
Control according to
boiler temperature
differential
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