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10 Appendix
Footnotes of the process sequence chart
Legend of the process sequence chart
Any condition
t1 Readiness
t2 Running time, servo actuator
t3 Pre-purge time
t4 Running time, servo actuator
t5 Ignition position
t6 Retardation of the re-circulation damper
t7 Base firing rate
t10 Operating phase
t11 Control mode
t12 Post-purge time (optional) 0 - 255 s, adjustable
* If the ducts run closed after a shut-off, the pre-purge signal is ignored until they
have reached the lower monitoring threshold.
** In the absence of the re-circulation signal, the re-circulation dampers remain closed
or run closed (even in pre-purge). The extend to which re-circulation is retarded dur-
ing pre-purge compared to the air damper, can be set via parameter "VODeIR (No.
427) "0".
*** Parameters can be used to select whether the signal is to function as a limit switch
or whether it is always present after ignition.
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