Lochinvar Corporation

Robert W Wiseman

Howard Scott Ryan

Douglas M Russell

Kurt R Werner

Mohamed Mehdi Doura

Brian J Iske

Benjamin Paul Putnam

Neil W Rolph

Dave C Baese

Elan R Christen

Moshin H Ibrahim

John Charles Paine

Curtis George Gagne

Daniel B Mitchell

John Paine

Daniel Mitchell

A hydronic water heating system heats water for various types of heat emitters. A boiler assembly includes a user interface which receives user-defined water temperature set point corresponding to a minimum outdoor temperature, and an integrated controller generates a nonlinear outdoor reset curve between the user-defined set point and a second set point corresponding to maximum outdoor temperature for which heating is required, and regulates the boiler to heat water to a temperature corresponding to a set point along the nonlinear output reset curve and based on a detected outdoor temperature. The nonlinear outdoor reset curve may be generated based on aggregated heat output functions for various types of heat emitters. A linear outdoor reset curve may be generated between a maximum water temperature set point and the user-defined set point, having a slope equal to an instantaneous slope of the nonlinear outdoor reset curve at the user-defined set point.

Boiler integrated control with non-linear outdoor reset methodology

A modulating burner apparatus includes a burner and a blower placed upstream of the burner. A venturi is placed upstream of the blower. A damper valve is placed upstream of the venturi. The damper valve has an open position and a restricted position. A smaller gas valve and a larger gas valve are communicated with the venturi. A controller is operably associated with the system to select a position of the damper valve and to select the appropriate one of the gas valves so as to provide a low output operation mode and a high output operation mode, which in combination provide an overall turndown ratio of at least 25:1.

Modulating burner with venturi damper

Boiler cabinet and cover

Cover for a boiler cabinet

Growing community of inventors

Brentwood, TN, United States of America

Robert W Wiseman