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Thermostat calls for heat. Induced draft fan motor starts. Vent pressure switch verifies pressure. Simultaneously gas valve opens and ignitor lights burner(ignition varies: hot surface ignitor, electronic spark ignitor, or standing pilot). Flame is sensed. High limit temperature switch is made. Blower fan runs. Thermostat calls for no heat. Gas valves close. Burners shut off. Induced draft fan shuts off. Blower fan put into fan delay(fan blower continues to run). Low limit temperature switch made. Fan blower stops.

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