Temperature Controller for Unit

Abstract

A temperature controller for a positive pressure room air purification unit is provided with a sensor for ambient room air temperature and supply duct air temperature. Based on the desired temperature, supply duct air may be drawn or drawn and heated.

1 . A temperature controller system for a positive pressure air purification unit comprising:
 a positive pressure air purification unit disposed within a room, having a first inlet in fluid communication with an HVAC supply duct, a second inlet in fluid communication with ambient air within a room, a filter for filtering air, an outlet, and a fan having a plurality of speed settings disposed between said filter and said outlet for drawing air from at least said first inlet;   a first temperature sensor disposed on an exterior surface of said positive pressure air purification unit adapted to sense ambient room air temperature;   a second temperature sensor disposed within said positive pressure air purification unit adapted to sense supply duct air temperature of an HVAC duct system;   a room air damper infinitely movable between an open and a partially closed position to allow air from the supply duct to be drawn and positionally controlled by said temperature controller system, said room air damper being incapable of fully closing the supply duct;   a user input interface for inputting a desired temperature; and   wherein said room air damper is moved by said temperature controller between said open position and said partially closed position, such that some volume of air is always drawn from said HVAC supply duct by said positive pressure air purification unit to create a positive pressure in the room in which said positive pressure air purification unit is disposed.   
     
     
         2 . The temperature controller system according to  claim 1 ,
 wherein when said room air damper is in an open position, air is drawn only from said first air inlet and no air is drawn from said second air inlet, and   wherein when said room air damper is in a partially closed position air is drawn from said second air inlet and a much smaller volume of air is drawn from said first air inlet, such that a volume of air is always drawn from said first air inlet, said room air damper being capable of assuming any position between said open position and said partially closed position.   
     
     
         3 . The temperature controller system according to  claim 2 ,
 wherein said room air damper will be moved to an open position when said supply duct air temperature is less than ambient room air temperature and said input desired temperature is less than ambient room air temperature; and   wherein said room air damper will be moved to an open position when said supply duct air temperature is greater than said ambient room air temperature and said input desired temperature is greater than ambient room air temperature.   
     
     
         4 . The temperature controller system according to  claim 2 , wherein said room air damper will be moved to an open position when said supply duct air temperature is less than ambient room air temperature and said input desired temperature is less than or equal to a positively-weighted ambient room air temperature; and wherein said room air damper will be moved to a partially closed position when a negatively-weighted ambient temperature is less than or equal to the input desired temperature and said supply duct air temperature is less than said ambient room air temperature. 
     
     
         5 . The temperature controller system according to  claim 2 , wherein said room air damper will be moved to an open position when said supply duct air temperature is greater than ambient room air temperature and said input desired temperature is greater than or equal to a negatively-weighted ambient room air temperature; and wherein said room air damper will be moved to a partially closed position when a positively-weighted ambient temperature is greater than or equal to the input desired temperature said supply duct air temperature is greater than said ambient room air temperature. 
     
     
         6 . The temperature controller system according to  claim 1 , wherein said user input interface further comprises an input for setting a desired fan speed. 
     
     
         7 . The temperature controller system according to  claim 6 , wherein said temperature controller system ignores said user-input set fan speed when said controller system is in automatic mode. 
     
     
         8 . The temperature controller system according to  claim 1 , wherein said room air damper is biased to assume an open position upon the occurrence of one of the following events selected from the following group: loss of power, malfunction of said first temperature sensor, malfunction of said second temperature sensor, malfunction of said controller system, and malfunction of said fan. 
     
     
         9 . The temperature controller system according to  claim 1 , wherein said positive pressure air purification unit further comprises:
 a plate attached to one of two perpendicular air flow paths, blocking fluid communication between a supply duct and said positive pressure air purification unit;   wherein said first inlet allows fluid communication between one of two perpendicular air flow paths and said damper.