Patent ID: 11188104

Abstract:
An electronic thermostat replaces an electro-mechanical thermostat and is located in a different location from the blower motor it controls. The electronic thermostat controls the blower motor on the same wires from which the thermostat receives power. The safe, low voltage power supply that powers the electronic thermostat is located at the blower motor location and is housed in the Blower Motor Module (BMM). This configuration has the advantage that it removes a bulky and space consuming component from the thermostat, the A/C transformer. This also reduces the amount of power (heat) dissipated by the electronic thermostat power supply, thus reducing a source of potential temperature measurement inaccuracies. Also, removing the 120 VAC power from the thermostat and replacing it with an isolated low voltage source increases safety. This architecture also makes the necessary over the power wires communications less complex and safter, and it reduces the number of components necessary to accomplish the communication's link, and makes the link more robust and noise immune.