Patent ID: 7746242
Filing Date: 2010-06-29
Classification: G01R

Abstract:
1. A method of indicating a low battery condition in an HVAC controller having a battery, the method comprising steps of: determining a first low battery condition by detecting a first battery voltage; providing a first indication in response to said first low battery condition; determining a second low battery condition by detecting a second battery voltage, wherein the second low battery condition is determined to be more severe than the first low battery condition; providing a second indication in response to said second low battery condition, wherein the second indication is more noticeable to a user than the first indication, and the second indication includes an audible indication; and wherein the HVAC controller is configured to control one or more units of HVAC equipment according to a programmed set point, and further wherein the first and second indications are provided while the HVAC controller continues to control the one or more units of HVAC equipment according to a programmed set point.