Variable volume constant throw terminal re-heat system

Claim 2

A variable volume constant throw terminal re-heat system for temperature conditioning the air of a room in a building comprising an air supply source, grille means opening into said room, duct means for communicating said air supply with said grille means, a unit including a housing defining a passage for air to flow therethrough, said housing being interposed in said duct means, means for heating said air supply, said heating means being positioned internally of said housing, heating damper valve means having infinite positions for selectively and gradually admitting a portion of said air supply linearly through said heating means and for selectively stopping the passage of said air supply through said heating means; cooling damper valve means having at least an open position, intermediate positions and a closed position for thermal sealing the downstream side of said heating means when in said open position, for selectively reducing the cross sectional area effectively of said passage when in said intermediate positions, and for selectively stopping the passage of air to said grille means, except the air which may be admitted through said heating means, when in said closed position; and means for proportionally varying the volume of air passing through said housing to maintain a constant air pressure adjacent to and upstream of said heating and cooling damper valVe means irrespective of the positions thereof.

Claim 3

The apparatus of claim 1 which includes means dividing said passage into an upper flow path and a flower flow path containing said heating means, with said lower flow path being disposed below said upper flow path to cause the heated air to exit from said grille below the cooler air.

Claim 4

A variable volume constant throw terminal re-heat system for temperature conditioning the air of a room in a building comprising a cooled pressurized air supply source, grille means opening into said room, duct means for communicating said pressurized air supply source with said grille means, a unit including a housing defining a passage for air to flow therethrough, said housing being interposed in said duct means, means for heating said air supply, said heating means being positioned internally of said housing downstream from said pressurized air source, heating damper valve means having infinite positions including an open position and a closed position for selectively and gradually admitting a portion of said air supply linearly through said heating means as said heating damper valve means is moved from said closed position to said open position and for selectively stopping the passage of said air supply through said heating means when moved to positions including at least an open position, intermediate positions and a closed position for thermal sealing the downstream side of said heating means when in said open position to insulate said heating means from said air supply as it passes adjacent thereto, for selectively reducing the cross sectional area effectively of said passage when in said intermediate positions, and for selectively stopping the passage of air to said grille means, except the air which may be admitted through said heating means, when in said closed position; control means including thermostatic switch means positioned in said room operably coupled to said cooling damper valve means for actuating said cooling damper valve means, means interconnecting said heating damper valve means with said cooling damper valve means for sequentially actuating said heating damper valve means with said cooling damper valve means as said cooling damper valve means responds to said thermostatic switch means, and means for maintaining a constant air pressure within said housing as said heating and cooling damper valve means sequentially respond to said thermostatic means.

Claim 5

A variable volume constant throw terminal re-heat system for temperature conditioning the air of a room in a building comprising a cooled pressurized air supply source, grille means opening into said room, duct means for communicating said pressurized air supply source with said grille means, a unit including a housing defining a passage for air to flow therethrough, said housing being interposed in said duct means, means for heating said air supply, said heating means being positioned internally of said housing downstream from said pressurized air source, heating damper valve means having infinite positions including an open position and a closed position for selectively and gradually admitting a portion of said air supply linearly through said heating means as said heating damper valve means is moved from said closed position to said open position and for selectively stopping the passage of said air supply through said heating means when moved to positions including at least an open position, intermediate positions and a closed position for thermal sealing the downstream side of said heating means when in said open position to insulate said heating means from said air supply as it passes adjacent thereto, for selectively reducing the cross sectional area effectively of said passage when in said intermediate positions, and for selectively stopping the passage of air to said grille means, except the air which may be admitted through said heating means, when in said closed position; control means including thermostatic switch means positioned in said room operably coupled to said cooling damper valve means for actuating said cooling damper valve means, means interconnecting said heating damper valve means with said cooling damper valve means for sequentially actuating said heating damper valve means with said cooling damper valve means as said cooling damper valve means responds to said thermostatic switch means, and means for maintaining a constant air pressure within said housing as said heating and cooling damper valve means sequentially respond to said thermostatic means.

Claim 6

The apparatus of claim 3 in which said means interconnecting said heating damper valve means and said cooling damper valve means is arranged so that said heating damper valve means remains in said closed position as said cooling damper valve means moves between said open position and a predetermined one of said intermediate positions and said heating damper valve means being also arranged to move from said closed position to said open position as said cooling damper valve means moves from said one of said intermediate positions to said closed position, said movement of said heater damper valve means being proportionate with said movement of said cooling damper valve means.

Claim 7

The apparatus of claim 4 in which said heating means, said heating and said cooling damper valve means are located terminally of said duct means adjacent said grille means and are arranged so that the total area of said grille means passes air therethrough when said heating damper valve means is in said closed position and said cooling damper means is in said open position.

Claim 8

The apparatus of claim 3 in which is included air return duct means having an opening at the one end thereof leading into said room, said opening communicating with said cooled pressurized air supply source for receiving a volume of ambient air from said room and thereby returning it to said air supply source, and said means for maintaining a constant air pressure within said duct means includes by-pass damper valve means adjacent said cooling damper valve means for by-passing a variable volume, Having predetermined limits, of cooled air from said housing and being operable responsive to actuation of said cooling damper valve means.

Claim 9

The apparatus of claim 6 in which said by-pass damper valve means includes by-pass duct means communicating with said air return duct means for recirculating said variable volume of cooled by-passed air through said pressurized air supply source.

Claim 10

The apparatus of claim 6 in which is included means for holding said heating damper valve means in said closed position while said cooling damper valve means and said coacting by-pass damper valve means continue to be operably responsive to said thermostatic switch means.

Claim 11

The apparatus of claim 5 in which is included baffle means adjacent said grille means for maintaining optimum air velocity through said grille means as said cooling damper valve means is in the range between said predetermined intermediate position and said closed position and said heating damper valve means is in the range between said closed position and said open position.

Claim 12

The apparatus of claim 9 in which said baffle means has at least an operable position and a non-operable position, and in which is included spring means for urging said baffle means from said non-operable to said operable position, and means for holding said baffle means in a predetermined position defining said operable position.