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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 4 Burner control 13.08.2004
4.2 Program sequence
The sequence diagrams show the program sequence in detail (refer to 4.2.5 Sequence
diagrams).
4.2.1 Parameters
The most important time parameters for the program sequence are the following (refer
to 7.5 Menu and parameter lists):
− Prepurge time
− Preignition time / circulation time heavy oil
− Safety time 1 (TSA1)
− Safety time 2 (TSA2)
− Interval 1
− Interval 2
− Postpurge time 1 (t8-1) with FGR damper shut (this part of the postpurge time is al-
ways executed)
− Postpurge time 3 (t8-3) with FGR damper open (this part of the postpurge time will be
interrupted when there is demand for heat)
− Postpurging in the lockout phase (if G = ON before lockout occurred)
All the times mentioned above - with the exception of «Postpurging in the lockout
phase» - depend on the type of fuel, which means that different times can be set for oil
and gas.
The prepurge time and the safety times are safety-related. This means that, using the
AZL51…, the heating engineer can only readjust them in the «safe» direction (against
internal maximum or minimum values).
In other words, «ts» times can only be shortened and «tv» times can only be extended.
Time parameters
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