Lochinvar ECOKNIGHT EKW46CE Installation Manual page 59

If flame is not detected after spark ends the control will perform a post-purge, then
start another pre-purge cycle and try to light the water heater again. On the 145
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model up the control will lock out after this second attempt on the 115 down a
further four attempts will be made before the unit goes to lock-out.
If the flame is detected it holds the firing rate steady for a few seconds then begins
to modulate the firing rate based on a set point or some other command (such as
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the 0-10v signal)
Once the call for heat is satisfied the control will turn off the burner. The fan will
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continue to run during the post-purge period.
Any pumps that are running will continue for their respective pump overrun time
period before switching off. A 60 second anti-cycle period will start which will delay
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any call for heat.
In standby ready to start a new cycle.
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1.1.1 SEQUENCE OF OPERATION
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