Burner flashback detection and system shutdown apparatus

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

2007-04-12

2010-12-14

McAllister, Steven B (Department: 3749)

Liquid heaters and vaporizers

Stand boiler

Fluid fuel burner

C122S014200, C122S014310, C122S014100, C431S021000, C431S022000

Reexamination Certificate

active

07849821

ABSTRACT:
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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Canadian Patent Office, Office Action dated Sep. 4, 2009, Application No. 2,628,762, 2 pages.

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