SENSI™ LITE SMART THERMOSTAT Installation guide Models: 1F76U-22WFB series, ST25 series Version: February 2023 R-5664
DOWNLOADING THE APP AND CREATING AN ACCOUNT YOU WILL NEED Gather this information before you begin installation for a smoother walk through. - Wi-Fi Network Name/SSID (Make sure this is a 2.4GHz network) - Wi-Fi Network Password - Screwdriver - Hardware in Sensi Lite smart thermostat packaging DOWNLOAD THE SENSI APP The Sensi Lite smart thermostat is a Wi-Fi enabled device. To install and configure your thermostat correctly, you must use the Sensi app.
INSTALLING THE SENSI THERMOSTAT STEP 1 Add your thermostat to the Sensi app INSTALLATION Once you have downloaded the Sensi app and have created an account, you are ready to install the thermostat to your wall and connect it to Wi-Fi. If there are no registered thermostats, tap the plus (+) sign to add a thermostat. First, choose which thermostat you purchased.
INSTALLING THE SENSI THERMOSTAT STEP 3 Remove the old thermostat from your wall GATHER TOOLS AND PACKAGE CONTENTS Gather all the necessary tools for installation. TURN OFF POWER Turn off the power to your heating and air conditioning system before handling your thermostat wires. REMOVE OLD THERMOSTAT COVER Remove the cover using a screwdriver or by pushing the pressure latch. Some covers pull off while others need to be released using a screwdriver. PHOTOGRAPH YOUR WIRING THIS IS IMPORTANT.
INSTALLING THE SENSI THERMOSTAT FURNACE TYPE Select what type of system you have. LABEL YOUR WIRES Before you disconnect your wires, label your wires using the label stickers provided one wire at a time. DISCONNECT WIRES AND REMOVE BASE After all of your wires are labeled, remove the old thermostat base from the wall. STEP 4 Secure your new thermostat base to the wall and connect wires INSTALL SENSI BASE Use the mounting screws provided and secure the Sensi base to the wall.
INSTALLING THE SENSI THERMOSTAT STEP 6 Connecting to Wi-Fi and registering your thermostat Pro Tip: If the thermostat screen is not turning on after wiring installation, the batteries may not be installed properly. See the troubleshooting section on pg. 7 for more information. WI-FI SETUP On the thermostat, press and hold the Mode Button for four seconds. You will see the setup and Wi-Fi icons appear.
TROUBLESHOOTING Why isn’t my heating/cooling turning on? • Ensure that there is power to your HVAC system and there is no error code on your control board indicating a system issue. ― If there is an error code or no power to your system, contact an HVAC professional to service your equipment. • Reset breakers. • Make sure the furnace/air handler door compartments are securely screwed down and closed. If the door panels are not secure, the system will not start. • Secure wire connections.
NOTES HVAC configuration menu If you want to check that your thermostat’s HVAC settings were configured correctly or you’re experiencing a system issue, refer to the chart for equipment descriptions and options. Learn more about how to properly configure your thermostat here: Menu item Description Options Outdoor Equipment Select AC or Heat Pump equipment AC/HP/-- sensi.emerson.
NOTES Installing multiple thermostats If you are installing more than one thermostat, follow the same installation process in the Sensi app. Once you have one thermostat installed, open the Sensi app on your phone. At the main screen, press the + sign to add another thermostat to your account. Accessing account information You can use the Account area to access your email preferences and change your account information and the email address associated with your Sensi.
NOTES CONVENTIONAL SINGLE-STAGE OR MULTI-STAGE SYSTEMS (NO HEAT PUMP) Thermostat System configuration Common wire** (24V) 1st-stage heat Indoor blower (fan) *System only capable of multi-stage heating or multi-stage cooling, not both. Common wire* (24V) 1st-stage auxiliary/emergency heat (2nd-stage heat) Indoor blower (fan) 1st-stage heat and cool (compressor) Heat pump changeover (reversing valve) connection (configure as O or B in the installer menu).
