Burner flashback detection and system shutdown apparatus

Details Burner flashback detection and system shutdown apparatus Burner flashback detection and system shutdown apparatus

F - Mech Eng,Light,Heat,Weapons

23

K

F23K 5/16 (2006.01) F23D 14/82 (2006.01) F23N 5/24 (2006.01) F24H 9/20 (2006.01)

Patent

CA 2694080

A fuel-fired water heater is provided with a premixing type main burner and an associated pilot burner for igniting it. A specially designed protective system is operative to detect a flame flashback burning condition in the main burner and responsively shut down the water heater. In one embodiment thereof, the protective system uses main burner body heat to melt a portion of a fuel supply line connected to the pilot burner during a flame flashback condition in the main burner. Such melting responsively causes an associated fuel supply valve to close and terminate water heater operation. In a second protective system embodiment a normally closed pressure switch is opened, thereby shutting down the water heater, when the switch detects a pressure indicative of a flame flashback condition in the main burner.

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