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Part # MCOSM06 Rev 1 (11/03/08) Page 33
Figure 2
No
Yes
Yes
No
Maximum
number of trials
attempted?
Yes
No
Yes
No
Yes
No
Yes
De-energize
control and valves
No
Sixteenth
ameout?
Control with
ignition
recycle?
Ignition lockout
(optional LED
ashes)
Yes
No
Recycle delay
period
Shuto
Flame present when
not expected
Hard Lockout
(optional LED
turns o)
Start
Thermostat
call forheat
Prepurge
Flame
present for
30 seconds?
Detected fault
Trial for
ignition
Pilot
ame
sensed?
Energize
main valve
Run
Thermostat
calling for heat?
Flameout?
Interpurge
End