SENSITM SMART THERMOSTAT Installation guide Models: 1F87U-42WF, ST55 Version: January 2020 © 2020 Emerson Electric Co. All rights reserved R-5020.
Table of Contents Downloading the app and creating an account 3 Installing the Sensi thermostat 4 Connecting the Sensi thermostat 7 Troubleshooting 8 Notes 10 Sensi Smart Thermostat | INSTALLATION GUIDE 2
DOWNLOADING THE APP AND CREATING AN ACCOUNT You Will Need Gather this information before you begin installation for a smoother walk through. • Sensi Password - Found on the back of the Welcome Guide, or back of the thermostat face plate labelled “Sensi Security Code”) • Wi-Fi Network Name/SSID - Make sure this is a 2.4GHz network. • Wi-Fi Network Password • Screwdriver • Hardware in Sensi Smart thermostat packaging Download the Sensi app The Sensi Smart Thermostat is a Wi-Fi enabled device.
INSTALLING THE SENSI THERMOSTAT 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. 9:41 Cancel 74 If no thermostats are registered yet, tap the “+” sign to add a thermostat. Then, choose which thermostat you purchased. • 1F87U-42WF series Add Thermostat Select your thermostat Touch Wi-Fi Thermostat • ST55 seriesI Note: You can check your model number on the back of the thermostat faceplate.
INSTALLING THE SENSI THERMOSTAT Turn Off Power Turn off the power to your heating and air conditioning system before handling your thermostat wires. 9:41 9:41 Install Cancel Install Cancel Turn Off Power Do not remove your wires yet! Dismiss 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.
INSTALLING THE SENSI THERMOSTAT Label Your Wires Using the provided wire label stickers, label your wires by removing one wire at a time. 9:41 9:41 Install Cancel Label your wires Label Wires After all of your wires are labeled, remove the old thermostat base from the wall.
INSTALLING THE SENSI THERMOSTAT Connecting to Wi-Fi This portion of the installation guide covers how to connect your thermostat to Wi-Fi. If you chose “No, it needs to be installed,” the app will provide instructions for installing and wiring your thermostat before you connect to Wi-Fi. If you had your Sensi thermostat installed by a professional or if you have already installed and wired your Sensi thermostat yourself, but have not yet connected to Wi-Fi, choose “Yes, it is on the wall.
INSTALLING THE SENSI THERMOSTAT Name Thermostat You can select a name or choose a custom name for your thermostat. Press “Next” to continue. 6:10 Register Contractor Information Telephone Number If you have a contractor, please enter the phone number. This step is optional. Register thermostat After successfully connecting Sensi, the app will prompt you to register the thermostat.
TROUBLESHOOTING Connecting to Wi-Fi Troubleshooting If you’re having trouble connecting to Wi-Fi, here are some tips to try: • M ake sure the Sensi app is up-to-date and running the latest version available in your app store. • Reboot your smart phone. • R eboot your router by unplugging it from the wall for a few minutes and then plugging it back in. • A fter your router reboots, and your Wi-Fi network has internet access again, make sure that your phone is connected to your 2.4GHz Wi-Fi network.
NOTES HVAC configuration menu If you chose the option “No, it needs to be installed” and walked through the installation process on the Sensi app, the app should have correctly configured your thermostat for your system type. However, if you are experiencing an issue or you want to check your system configurations, you can manually configure your thermostat as well. Learn more about how to properly configure your thermostat by searching “configure” on our support site at sensi.emerson.com/en-us/support.
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, tap the + sign to add another thermostat to your account.
NOTES SINGLE STAGE OR MULTI-STAGE SYSTEM (NO HEAT PUMP) WITH TWO TRANSFORMERS Thermostat † System Configuration Single Stage AC1 GA1 EL1 MultiStage AC2 GA2 EL2 Cool Mode 2nd Stage 24 Volt (Hot) Cool 24 Volt (Hot) Heat 24 Volt (Common) Cool Mode 1st stage Heat Mode 1st Stage Humidifier Blower Heat Circulator Mode 2nd Stage Fan Energized On Call For Cool O Energized Constantly in Cool Mode (Factory Default) (And Heat B If ConfiEnergized Constantly gured DeIn Heat humidifier For Electric Mode (Or H
