Part # MCOSM06 Rev 1 (11/03/08) Page 33

Figure 2
No 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