Part # MCOSM06 Rev 1 (11/03/08) Page 33
Figure 2No Yes
Yes
No Maximum
number of trials
attempted?
Yes
No
YesNo
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 valveRun
Thermostat
calling for heat?
Flameout?
Interpurge
End