Patent ID: 8479689
Filing Date: 2013-07-09
Classification: F22B

Abstract:
1. A control system for a multiple boiler plant with mixed condensing and non-condensing boilers comprising: a system control unit; a plurality of boilers said boilers being separated into separate condensing and non-condensing groups each of said groups having at least one boiler, said system control unit receiving a system threshold level to select which of said separate groups shall serve as lead boiler group for a selected boiler operating condition, said system threshold comprising a desired water supply temperature; an operation condition sensor for sensing system operating conditions, said system control unit receiving information from said operation condition sensor, said system control unit further receiving customer programmed parameters, whereby said operation conditions and said customer programmed parameters are used to determine said desired water supply temperature; said desired water supply temperature being stored by said system control unit, said system control unit receiving a selected switch temperature, said switch temperature comprising a temperature switch point; comparator means to compare said desired water supply temperature with said temperature switch point to generate a control signal to control which separate group shall be the lead group in response to a control signal provided by said comparator means.