Continuous Pump Operation - Siemens LMS14 User Manual

Continuous pump
operation
Building Technologies Division

6.5.20 Continuous pump operation

Line no.
HC1 HC2 HC3
809 1109 1409
In the case of continuous pump operation, the pump (boiler or heating circuit pump)
also keeps running when the heating circuit receives no valid heat request (e.g. during
quick setback, or when the room thermostat's contacts have opened).
Continuous pump operation does not generate a valid heat request, which means that
the burner will not be put into operation. For mixing circuits, a local setpoint of 8 °C
applies so that the mixing valve maintains the flow temperature at that level.
In the case of heating circuits without own heating circuit pump, the diverting valve's
normal position must be parameterized as the heating circuit position. Otherwise, the
diverting valve changes over to the DHW position during continuous pump operation.
No
The heating circuit pump/boiler pump can be deactivated via quick setback or when
reaching the room temperature setpoint.
Yes
The heating circuit pump/boiler pump also keeps running during quick setback and
when reaching the room temperature setpoint.
Note!
If Overtemp prot pump circuit (820, 1120, 1420) is released, it becomes active due to
the low local setpoint of 8 °C – even in the case of continuous pump operation. To
prevent this, Overtemp prot pump circuit (820, 1120, 1420) must be deactivated.
User Manual LMS14...
6 The settings in detail
Operating line
Continuous pump operation
No
Yes
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CC1U7471en
07.05.2014