System and method for reduced purge operation of a forced...

Details System and method for reduced purge operation of a forced... System and method for reduced purge operation of a forced...

Category

F - Mech Eng,Light,Heat,Weapons

Subcategory

24

Subsubcategory

H

IPC codes

F24H 9/20 (2006.01) F23N 1/02 (2006.01) F23N 1/10 (2006.01) F24H 9/18 (2006.01) F23N 3/08 (2006.01)

Type

Patent

Patent number

CA 2135675

Description

A system and method for controlling operation of a water heater provides generating a heating demand signal which a minimum level corresponds to a required heat input for maintaining water temperature in the water tank in case of no exogenous demand for water. Responsive to the heating demand signal, air flow from the forced draft blower and flow of combustible fluid from the combustible fluid delivery system are varied to produce combustion product over a minimum 15 to 1 ratio. This allows water heating to be varied to meet maximum expected exogenous demand or to maintain water temperature with no exogenous demand.

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