Retrofit air conditioning system

A retrofit air conditioning unit for receipt in an existing distribution unit of a room, comprising:

• a housing sized for receipt in the distribution unit;
• a primary air inlet for receiving conditioned air from a conditioned air source into said housing;
• an adjustable damper disposed across said primary air inlet;
• means for adjusting said adjustable damper in response to a first damper signal;
• a recirculated air inlet for receiving recirculated air from the room into said housing;
• a fan disposed in said housing downstream of said adjustable damper and said recirculated air inlet, said fan inducing conditioned air through said adjustable damper and inducing recirculated air through said recirculated air inlet, said fan exhausting a mixture of conditioned air and recirculated air;
• means for sensing temperature in the room and producing a temperature signal;
• means for heating the mixture of conditioned air and recirculated air, said heating means being responsive to a plurality of heating signals to provide a corresponding plurality of heating levels;
• and
• controller means for receiving the temperature signal and producing the first damper signal and the plurality of heating signals in accordance with the sensed temperature.

A retrofit air conditioning unit for receipt in an existing distribution unit of a room, comprising:

• a housing sized for receipt in the distribution unit;
• a primary air inlet for receiving conditioned air from a conditioned air source into said housing;
• an adjustable damper disposed across said primary air inlet;
• means for adjusting said adjustable damper in response to a first damper signal;
• a recirculated air inlet for receiving recirculated air from the room into said housing;
• a fan disposed in said housing downstream of said adjustable damper and said recirculated air inlet, said fan inducing conditioned air through said adjustable damper and inducing recirculated air through said recirculated air inlet, said fan exhausting a mixture of conditioned air and recirculated air;
• means for sensing temperature in the room and producing a temperature signal;
• controller means for receiving the temperature signal and producing the first damper signal in accordance with the sensed temperature;
• means for heating the mixture of conditioned air and recirculated air in response to any of a plurality of heating signals;
• wherein said controller means includes means for producing the heating signals in accordance with the sensed temperature;
• a fan discharge plenum disposed downstream of said fan and receiving the mixture of conditioned air and recirculated air exhausted from said fan;
• said fan discharge plenum being acoustically insulated to reduce noise transmitted to the room;
• said fan discharge plenum including said heating means, said fan discharge plenum exhausting the mixture of conditioned air and recirculated air through said heating means;
• and
• an expansion nozzle disposed downstream of said fan discharge plenum;
• wherein said expansion nozzle receives the mixture of conditioned air and recirculated air exhausted from said fan discharge plenum at a first velocity and exhausts the mixture at a reduced second velocity.

An air conditioning system for supplying conditioned air to a room, comprising:

• a housing;
• means for receiving conditioned air into said housing;
• means for adjusting the amount of conditioned air received into said housing in response to a first signal;
• means for receiving recirculated air from the room;
• fan means for inducing the conditioned air into said housing and the recirculated air from the room, said fan means exhausting a mixture of conditioned air and recirculated air;
• means for sensing temperature in the room and producing a temperature signal;
• controller means for receiving the temperature signal and producing a first signal in accordance with the sensed temperature;
• means for heating the mixture of conditioned air and recirculated air in response to a second signal;
• wherein said controller means includes means for producing a second signal in accordance with the sensed temperature;
• and
• means for cooling the mixture of conditioned air and recirculated air in response to a third signal;
• wherein said controller means includes means for producing a third signal in accordance with the sensed temperature.

A retrofit air conditioning system for use with an existing induction air conditioning system of a building having a plurality of rooms, the existing system including an existing central fan system supplying conditioned air through existing ducting of the building to a plurality of existing distribution units corresponding to the plurality of rooms, wherein each distribution unit includes an existing heating unit receiving heat from an existing heat source and an existing induction unit receiving conditioned air from the existing ducting, the heating unit and induction unit being contained within an existing enclosure, said retrofit air conditioning system comprising:

• a retrofit induction unit sized for receipt in an existing distribution unit, said retrofit induction unit being received in the existing enclosure and replacing the existing heating and induction units, and said retrofit induction unit receiving heat from the existing heat source;
• said retrofit induction unit further comprising means for receiving the conditioned air from the existing ducting of the building, means for adjusting the amount of conditioned air received from the existing ducting in response to a first signal, means for receiving recirculated air from the room, fan means for inducing conditioned air from the existing ducting and inducing recirculated air from the room, said fan means exhausting a mixture of conditioned air and recirculated air, and means for receiving heat from the existing heat source and heating the mixture of conditioned air and recirculated air in response to a second signal;
• means disposed downstream from said fan means for diffusing said mixture of conditioned air and recirculated air, said diffusing means receiving said mixture at a first velocity and further exhausting said mixture at a reduced second velocity;
• means for sensing temperature in the room and producing a temperature signal;
• means for sensing the flow of conditioned air from the existing ducting into the retrofit induction unit and producing an air flow signal;
• and
• controller means for receiving the temperature signal and air flow signal and producing the first signal and the second signal in accordance with the sensed air flow and temperature.