Air conditioner blower control

Claim 1

In a home type heating and cooling system having a blower motor with at least two speeds, a common terminal of said blower motor being connected to a first side of a line voltage, stepped-down transformer means for reducing said line voltage to thermostat control means which includes a thermostat selector switch operatively connected to a secondary winding of said stepped-down transformer, a thermostat operatively connected to said thermostat selector switch to indicate if heating or cooling is desired, a fan selector switch having automatic and ON positions and being connected to said secondary winding, contactor relay means energized by said secondary winding via said thermostat and said thermostat selector switch if both call for cooling thereby connecting a compressor means and condenser fan means to said line voltage, heating control means connected to said thermostat selector switch to operate furnace means for heating if said thermostat and said thermostat selector switch call for heating, evaporator fan relay means connected to said fan selector switch and said secondary winding, the improvement comprising: economizer control relay coil means connected to said secondary winding and said thermostat for energization if said thermostat and said thermostat selector switch both call for cooling, said economizer control relay coil means switching said blower motor from low speed to high speed if said fan selector switch is in said ON position.

Claim 5

A method of controlling a heating and cooling system for regulating temperature in an enclosed space consisting of the following steps: first setting a thermostat selector switch to heat and a fan selector switch to automatic during the heating season; first energization of a heating control unit upon a thermostat closing indicating heat is required thereby beginning operation of a furnace to heat said enclosed space; closing a furnace fan switch to operate blower motor at low speed to circulate heat from said furnace to said enclosed space; second setting said thermostat selection switch to cool and said fan selector switch to ON during the cooling season; second energization of an evaporator fan relay means to continuously operate said blower motor; third energization of an economizer control relay means and a contactor relay means upon said thermostat closing indicating cooling is required, said contactor relay means connecting compressor means and condenser fan motor means to line voltage, said economizer control relay means operating said blower motor at a high speed during said third energization and at said low speed during remaining times of said cooling season.

Claim 6

A method of controlling a heating and cooling system for regulating temperature in an enclosed space consisting of the following steps: first setting a thermostat selector switch to heat and a fan selector switch to automatic during the heating season; first energization of a heating control unit upon a thermostat closing indicating heat is required thereby beginning operation of a furnace to heat said enclosed space; closing a furnace fan switch to operate blower motor at low speed to circulate heat from said furnace to said enclosed space; second setting said thermostat selection switch to cool and said fan selector switch to ON during the cooling season; second energization of an evaporator fan relay means to continuously operate said blower motor; third energization of an economizer control relay means and a contactor relay means upon said thermostat closing indicating cooling is required, said contactor relay means connecting compressor means and condenser fan motor means to line voltage, said economizer control relay means operating said blower motor at a high speed during said third energization and at said low speed during remaining times of said cooling season.

Claim 7

A method of converting a home heating and cooling system for regulating temperature inside a home; said home heating and cooling system having a heating furnace, compressor and condenser fan operated by a thermostat selector switch and thermostat means; multiple speed blower operated by a fan selector switch; evaporator switching means operating said multiple speed blower at a high speed if said fan selector switch is in an ON position, or if said thermostat selector switch and thermostat means both call for cooling, and at a low speed if said fan selector switch is in an automatic position and said thermostat selector switch and thermostat means calls for heating and said furnace fan switch is closed, said converting consisting of the following steps: disconnecting said evaporator switching means from said multiple speed blower; connecting economizer relay coil means between a cooling terminal of said thermostat means indicating cooling is required and to a voltage source; inserting relay contact means of said economizer relay coil means between said evaporator switching means and high and low speed terminals of said multiple speed blower; said relay contact means operating said multiple speed blower during the cooling season at a high speed when cooling is required and said compressor is operating, otherwise at a low speed.

Claim 8

A method of converting a home heating and cooling system for regulating temperature inside a home; said home heating and cooling system having a heating furnace, compressor and condenser fan operated by a thermostat selector switch and thermostat means; multiple speed blower operated by a fan selector switch; evaporator switching means operating said multiple speed blower at a high speed if said fan selector switch is in an ON position, or if said thermostat selector switch and thermostat means both call for cooling, and at a low speed if said fan selector switch is in an automatic position and said thermostat selector switch and thermostat means calls for heating and said furnace fan switch is closed, said converting consisting of the following steps: disconnecting said evaporator switching means from said multiple speed blower; connecting economizer relay coil means between a cooling terminal of said thermostat means indicating cooling is required and to a voltage source; inserting relay contact means of said economizer relay coil means between said evaporator switching means and high and low speed terminals of said multiple speed blower; said relay contact means operating said multiple speed blower during the cooling season at a high speed when cooling is required and said compressor is operating, otherwise at a low speed.