Reznor ULSA 035(EC) - Page 22

1701ULSA(EC)--EN, p. 22/30
Ignition system – time table
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Definitions
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Startposition
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Pre‐purgetime
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Safetytime
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Post‐purgetime
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Thesystemisnotinlock‐outpositionandcanproceedwiththestart‐upsequenceuponademandfor
heat.
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Thisisaperiodof20secduringwhichthecombustionfanoperatesprior
toactivationoftheignition
device.
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Thesafetytimeisthedelaybetweenthegasvalvebeingenergisedandtheflamesensorcheckingforthe
presenceofaflame.Thisisaperiodof5seconds.
Note:ifnoflameissensed,theburnerrelaywillattemptignition5
timesbeforegoingintolock‐out
mode.
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Thisisthetimeof10secondsbetweenburnershut‐downandthemomentthecombustionfan(venter)is
de‐energized.
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