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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Startup from postpurging
Direct startup from postpurging (TN2) can take place via Postpurging mode, provided
the mode was selected without home run and no air pressure switch is used (LP mode
1 or LP mode 5). If there is a request for heat during postpurging (TN2), the home run is
skipped and startup is immediately started without driving the fan to standstill during the
home run.
Note!
If monitoring of air supply is needed, interruptable postpurging is not permitted.
Start prevention
Certain internal or external events can trigger start prevention. In that case, the burner
control changes to phase STARTVER. The diagnostic code indicates the reason why
burner startup was prevented.
Some of the reasons are the following (among others):
Short-circuit or interruption of sensor
No gas pressure switch signal (depending on parameterization)
Open air pressure switch input (depending on parameterization)
Triggering of Limit thermostat function
Some of the functions that lead to start prevention can be deactivated through
parameterization.
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