Reversibly wireable evaporator coil freeze-over prevention device

Abstract

Heating, Ventilating, and Air Conditioning (HVAC) and refrigeration systems have a thermostat to allow users to set a desired temperature for living and storage spaces. The output from the thermostat is a so-called “Call for Cool” signal (CfC) used to start the system compressor and begin the cooling process. A circuit which interrupts the CfC signal from a thermostat to the compressor without using specific input and output connections to define the CfC signal is disclosed. The circuitry monitors the temperature of the evaporator, and if the temperature dips too low, the compressor is disengaged until the measured temperature rises above a safe level.

We claim: 
     
         1 . A reversibly wireable evaporator freeze-over prevention device comprising, in combination:
 a. a rectifier and regulator which may use either of two like color coded wires as an input, the second like color coded wire as an output and a third wire as common;   b. a driver electronically coupled to an interrupter wherein the interrupter may open the connection between the input and output;   c. a controller which may time events and measure a sensor signal, which controller is electronically coupled to the driver, to an alert device, and to an interface an interface electronically coupled to a temperature sensor.   
     
     
         2 . A reversibly wireable evaporator freeze-over prevention device as recited in  claim 1  wherein the alert device is a visible alert. 
     
     
         3 . A reversibly wireable evaporator freeze-over prevention device as recited in  claim 1  wherein the alert device is an audible alert. 
     
     
         4 . A reversibly wireable evaporator freeze-over prevention device as recited in  claim 1  wherein the alert device is a connection to a network in which to send an alert message. 
     
     
         5 . A reversibly wireable evaporator freeze-over prevention device as recited in  claim 4  wherein the connection to a network in which to send an alert message is a wireless connection.