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A method for operating a boiler including sensing a demand for heat and generating and ignition request to a flame safety controller. An ordered succession of evaluation modes compares normal operation to actual operation of control devices through the step of controlled ignition and transitions to

A method for operating a boiler including sensing a demand for heat and generating and ignition request to a flame safety controller. An ordered succession of evaluation modes compares normal operation to actual operation of control devices through the step of controlled ignition and transitions to a failure mode if an evaluation mode is not successfully completed. In addition, a series of status modes with each status mode being represented as an input condition are tested. A relative priority structure is established among the status modes and a unique message is associated with each status mode having an input condition that is true. Testing of the individual status modes proceeds in a predefined order until a status mode in a true condition is found and the unique message is displayed. In multiple boiler installations, a sequencer maintains a record of run times, determines an energy need and issues control commands to vary a firing rate or add or delete boilers giving consideration to the runtimes of the boilers.

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A method for operating a boiler including sensing a demand for heat and generating and ignition request to a flame safety controller. An ordered succession of evaluation modes compares normal operation to actual operation of control devices through the step of controlled ignition and transitions to

A method for operating a boiler including sensing a demand for heat and generating and ignition request to a flame safety controller. An ordered succession of evaluation modes compares normal operation to actual operation of control devices through the step of controlled ignition and transitions to a failure mode if an evaluation mode is not successfully completed. In addition, a series of status modes with each status mode being represented as an input condition are tested. A relative priority structure is established among the status modes and a unique message is associated with each status mode having an input condition that is true. Testing of the individual status modes proceeds in a predefined order until a status mode in a true condition is found and the unique message is displayed. In multiple boiler installations, a sequencer maintains a record of run times, determines an energy need and issues control commands to vary a firing rate or add or delete boilers giving consideration to the runtimes of the boilers. mprising the steps of generating laser light; providing a single multi-faceted mirrored polygon in a path of said laser light; generating a first group of scanning beams, a second group of scanning beams, and a third group of scanning beams by reflecting said Laser light off said mirror polygon; directing said first group of scanning beams through a first transparent member oriented in a first plane to scan a surface of the item from one orthogonal direction; directing said second group of scanning beams through the first transparent member oriented in the first plane to scan the item from a diagonal direction; and directing said third group of scanning beams through a second transparent member oriented in a second plane orthogonal to said first plane to scan the item from an other orthogonal direction. 8. An optical scanner comprising: a housing having a substantially vertical surface containing a first aperture and a substantially horizontal surface containing a second aperture; a single laser which produces a laser beam within the housing; a polygon spinner having mirrored facets for reflecting the laser beam in a plurality of directions to produce a plurality of scanning beams including a first group of scanning beams, a second group of scanning beams, and