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Once power is applied to the unit (120vac or 24vac), the system will allow gas to flow to the pilot assembly- the hot wire igniter will glow igniting the gas. The thermocouple on the pilot assembly will sense this pilot flame and safely open the valve to the main burner- the pilot flame then ignites the main burner. If at any time the pilot flame is lost, the unit will turn off the gas for safety, and then automatically restart.