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Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
6.11.25 Quick shutdown of burner
To prevent boiler overtemperatures under certain operating conditions, quick shutdown
with boiler temperature supervision is introduced. Resetting the DHW flow switch at the
instantaneous water heater and – with activated room thermostat supervision –
resetting the last active room thermostat of a heating circuit, starts the monitoring time
for quick shutdown. As soon as the DHW flow switch at the instantaneous water heater
makes, the monitoring time is ended. If, during the monitoring time, the boiler
temperature rises by more than the set temperature gradient within 400 ms, the burner
is switched off for the remaining monitoring time. The monitoring time is adjustable, the
function can be deactivated.
Line no. Operating line
2510 Quick shutdown temp grad
Here, you can set the maximum permissible boiler temperature rise within 400 ms. The
parameter can be used to deactivate the function.
Line no. Operating line
2511 Quick shutdown superv time
Here, you can set the supervision time.
Line no. Operating line
2512 Quick shutdown superv RT
Off
On
This parameter can be used to activate monitoring of the heating circuit’s room
thermostat.
Off
Only the DHW flow switch is monitored.
On
In addition to the DHW flow switch, the room thermostats of the heating circuits are
monitored.
Note!
When quick shutdown is activated and monitoring of the room thermostat is active,
the local boiler of a cascaded system can be switched off, independent of whether
other cascaded consumers demand heat and whether other boilers are in operation.
Quick shutdown is dependent on the progression of the local boiler temperature
during the monitoring time.
Prerequisites for quick shutdown:
- Quick shutdown on the local boiler is active
- The contacts of the last local room thermostat are open
Quick shutdown temp grad
Quick shutdown superv
time
Quick shutdown superv
RT
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