Emerson Electric Company

Andrew Juengst

Horst E Jaeschke

A controller for a fuel-fired appliance comprising a microprocessor that is able to detect an interruption in power, and immediately store errors and historical diagnostic information in a non-volatile memory before the microprocessor powers down. Upon restoration of power, the microprocessor would flash or display the most recent error codes on the controller's diagnostic LED or display. The microprocessor is also able to detect an open fuse condition, and flash or display the fuse error on the display.

Controller for fuel fired heating appliance

An apparatus is provided for controlling a fuel fired heating appliance, the apparatus comprising a first processor for controlling the ignition operation of the furnace and a second processor for controlling the operation of a variable speed blower motor, wherein the first processor sends communication signals to the second processor requesting a desired speed of the blower motor to provide air flow for combustion. The second processor responsively sends a signal to the first processor indicating the receipt of the requested speed for the blower motor. The apparatus further comprises at least one pressure switch, where the first processor senses an opening of the pressure switch and responds by successively sending incrementally higher speed request signals to the second processor until the first processor detects the closing of the at least one pressure switch.

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St. Louis, MO, United States of America

Andrew Juengst