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Standby
IQ Boiler Control
can display
Thermostat Calls
(typical)
for Heat
Self Testing
Circulator Output
Energizes
Limits Closed Checked
Waiting For
Damper To Close
Vent Damper Energized
Waiting For
Damper to Open
Ignition Source Energized
Pilot Gas On
Trial For Ignition
Pilot Flame
Proven
Ignition Source Off
Main Gas On
Call For Heat Ends
Main Gas Off
Vent Damper De-Energized
Circulator Output De-Energized
Standby
Figure 3: Sequence of Operation
Pilot Flame
Continuous
Not Proven
Ignition Source Off
Pilot Gas Off
Delay 60 Seconds
Retry
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