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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.13.7 Supervision of temperature differential
Line no. Operating line
3590 Temp differential min
This function prevents excessive cascade return
temperatures and improves the system’s switch-off
behavior.
If the temperature differential between sensor B10 and
sensor B70 becomes smaller than the set minimum
temperature differential (Temp differential min (3590),
one of the heat sources is switched off as early as
possible, independent of the selected lead strategy.
When the temperature differential is sufficiently great
again, the selected lead strategy is resumed.
T
B10
T
B70
7471z115/1009
Note!
Switching off due to the minimum temperature differential does not apply to the last
heat source in the cascaded system.
6.14 Extra heat source
The extra heat source is activated by configuring one of the Qx outputs to Heat request
K27.
Line no. Operating line
3690 Setpoint incr main source
For the period of time the extra heat source is released, the setpoint of the main heat
source is increased by the value set here.
This prevents the main heat source from reducing its level of modulation.
So the output of the main heat source is not reduced due to the additional output
delivered by the extra heat source.
Temp differential min
Setpoint incr main
source
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