Patent ID: 6684944
Filing Date: 2004-02-03
Classification: F04D,F24F,Y02B,Y10S

Abstract:
A method for controlling a fan motor of a forced air heating and cooling system for controlling the flow of air through said heating and cooling system, said heating and cooling, system including a first controller having a temperature sensor in an air conduit of said heating and cooling system for controlling operation of said motor during at least one of heating and cooling of a space, said method comprising the steps of:providing a second controller operable to be connected to a source of electrical energy and said motor, said second controller being operable for substantially continuously varying the speed of said motor between a minimum speed and a maximum speed independently of said first controller, said second controller including a first temperature sensor operable to sense the temperature of air in said conduit of said heating and cooling system, a second temperature sensor operable to sense a reference temperature of air in said space or returning from said space and circuit means operably connected to said temperature sensors for effecting a change in speed of said motor in response to a differential temperature sensed by said temperature sensors, respectively; operably connecting said second controller to said source of electric energy and said motor; and causing said second controller to substantially continuously change the speed of said motor between a minimum speed and a substantially maximum speed independently of said first controller and based on the differential temperature of air flowing through said heating and cooling system sensed by said temperature sensors, respectively.