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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.16.5 Overtemperature protection
Line no. Operating line
4140 Pump overrun time
If the temperature of the solid fuel boiler drops below the minimum temperature
differential or the minimum setpoint, the boiler pump remains activated for the
parameterized overrun time.
There is no pump overrun, if the pump was activated due to frost protection for the
boiler, frost protection for the plant, or overtemperature.
Line no. Operating line
4141 Excess heat discharge
If the boiler temperature reaches the set maximum value, excess heat discharge
becomes active. This forces the connected consumers to draw heat from the solid fuel
boiler. At the same time, the boiler pump is activated.
T
4141
0
1
Q10 + ZS
5 K
8310
t
7471d30/0910
Figure 69: Overtemperature protection - Excess heat discharge
Key
Line no. Meaning
4141 Excess heat discharge
8310 TKx Current boiler temperature
Q10 Solid fuel boiler pump
ZS Forced signal
Excess heat discharge is stopped when the boiler temperature lies 5 K below the set
Excess heat discharge (4141).
Using parameter Excess heat draw (e.g. (861) for heating circuit 1), it is possible to
select for every consumer whether or not the forced signal shall be considered, thus
deciding whether or not the consumer shall contribute to the dissipation of heat.
The discharge of excess heat in the system always takes place segment by segment.
System-wide distribution of excess heat discharge starting from segment 0 is not
possible.
The consumers give consideration to the forced signal only if demanded by parameter
Excess heat draw (e.g. (861) for heating circuit 1).
Note!
RVA... devices do not understand the forced signal and do not therefore take part in
the discharge of heat.
Pump overrun time
Excess heat discharge
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