Braeburn Model 3220 Multistage Non-Programmable Thermostat The digital non-programmable thermostat with auto changeover shall be a Braeburn model number 3220, 3.80″ high x 5.11″ wide x 1.42″ deep, powered with either 24 Volt AC or with two “AA” Alkaline batteries (3.0 Volt DC). In the event of a power failure, the unit shall retain all user, installer and temperature settings. The thermostat shall be compatible with low voltage single stage or multi-stage gas, oil, or electric conventional heating or cooling systems with up to two stages of heating and two stages of cooling, and heat pump systems with up to three stages of heating and two stages of cooling. Also compatible with 250mv – 750mv millivolt heating only systems and 2 or 3 wire hydronic zone systems. The thermostat shall have a bright blue backlight display, SpeedBar, separate sub-base and multi-level keypad lockout. Temperature control range shall be between 45 and 90 F (7 and 32 C), accuracy of +/- 1 F (+/- .5 C). Operating humidity range between 5% and 95% relative humidity. The thermostat shall include separate installer and user setup modes, permanent non-volatile memory to retain user settings, fillter, UV and humidifier pad check  monitor, residual cooling fan delay, indoor or outdoor remote sensor capability, auxiliary heat fossil fuel programming, and compressor power outage protection. A front reset button will return user settings to default values when pressed.FEATURES: • Large 4 Sq. In. Display with Bright Blue Backlight• Auto or Manual Changeover• SpeedBar  Multi-Function Button• Adjustable Temperature Limits• Indoor or Outdoor Remote Sensing• Permanent Memory Retains Settings• Separate User and Installer Reset Buttons• User Selectable Service Monitors• Hardwire or Battery Powered• Multi-Level Keypad Lockout• Set Point Adjustment Limits• Auxiliary Heat Fossil Fuel Option• Compre