Ducted secondary air fuel-fired water heater LDO detection

Details Ducted secondary air fuel-fired water heater LDO detection Ducted secondary air fuel-fired water heater LDO detection

2007-05-29

2007-05-29

Wilson, Gregory (Department: 3749)

Liquid heaters and vaporizers

Stand boiler

And condition responsive feature

C122S014200

Reexamination Certificate

active

11374356

ABSTRACT:
A radiant burner within the combustion chamber of a fuel-fired water heater is supplied with primary and secondary combustion air from outside the combustion chamber. A flame-holding mesh section of the burner is protected from becoming unacceptably clogged by particulate matter in the primary combustion air by causing the incoming secondary combustion air to flow sequentially through a finer mesh section and a tapered duct which increases the velocity of the secondary combustion air before causing it to impinge upon and cool a temperature sensor connected to a controller. Clogging of the finer mesh section decreases the cooling of the temperature sensor, thereby causing the controller to terminate operation of the burner before it becomes unacceptably clogged.

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