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The LED(s) (on some models) are used to indicate proper burner operation or errors.
During normal operation, the boiler operates as follows:
1. The triple aquastat temperature controller activates the burner based on a call for heat
or low limit setting.
2. If the preheater is hot enough to close the internal thermostat (120°F), then the
controller is released to start the burner.
3. The burner motor comes on, which starts the combustion air blower and compressor.
4. The ignition transformer is powered to spark the igniter.
5. The fuel pump turns on and the solenoid valve opens to start delivering fuel.
6. Within 15 seconds the flame lights, and is recognized by the cad cell.
7. The burner continues firing and the water is heated through the heat exchange tubes.
8. The triple aquastat controls the circulation pump to deliver hot water to the system.
9. The burner continues to operate until the aquastat temperature controller determines
that combustion is no longer needed due to low limit differential or high limit water
temperature settings being reached.
Primary Control
