Sensi Smart Thermostat Installation Guide
- June 6, 2024
- sensi
Table of Contents
SENSI™
SMART THERMOSTAT
Installation guide
Models: 1F87U-42WF, ST55
Version: January 2020
© 2020 Emerson Electric Co. All rights reserved
R-5020.
DOWNLOADING THE APP AND CREATING AN ACCOUNT
You Will Need
Gather this information before you begin the installation for a smoother walk-
through.
- Sensi Password
– Found on the back of the Welcome Guide, or back of the thermostat faceplate labeled “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. To install and configure
your thermostat correctly, you must use the Sensi app. To start the
installation process, download the Sensi app to your smartphone or tablet. It
is a free download. The Sensi app requires the following Operating System (OS)
software to download:
Android (Google Play) version 5.0 or later
iOS (Apple) version 10.0 or later
*Note that in the iOS store, the Sensi App will ONLY appear on an “iPhone only” search. On an iPad, change the search criteria in the App Store.
Create an
account
When you download the Sensi app, you will be prompted to create an account.
This is required to access your thermostat remotely and use all the features
Sensi offers. Use a valid email address and a password of your choosing to
create an account. Remember this email address and password. Your Sensi
thermostat will be linked to this email address once it is registered.
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. If no
thermostats are registered yet, tap the “+” sign to add a thermostat. Then,
choose which thermostat you purchased.
- 1F87U-42WF series
- ST55 seriesl
Note:
You can check your model number on the back of the thermostat faceplate.
Install Path
After creating an account, signing in, and choosing your model, the app will
ask you whether or not the thermostat is already on the wall. You will either
choose “No, it needs to be installed,” or “Yes, it is on the wall.”
The first option will walk through the entire installation process. If you did
not have this thermostat professionally installed, choose this option.
The second option is for connecting your thermostat to Wi-Fi only. If you have
had a professional install your thermostat, and you just need to connect the
Sensi thermostat to your home Wi-Fi network, choose this option.
No, it
needs to be installed.
This option will walk you through the entire installation process, including
identifying and connecting your wiring, as well as connecting to Wi-Fi. The
Sensi app will walk through a step-by-step process for installation.
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. The Sensi app will prompt you to take a picture of
your existing thermostat and old wiring in case you need it later. This can be
helpful for troubleshooting with our technical support team if necessary. The
picture you take will be saved to your camera roll or photo gallery.
Throw Away Any Jumper Wires
Sensi has a jumper wire built into it, and you will not need any jumper wires
from your old unit.
Choose Wire Terminals
Choose the terminal labels that have wires attached to them on your old
thermostat here. The app will tell you if you have a valid configuration.
If you are getting an invalid configuration message you can learn more about
compatibility at sensi.emerson.com/en-ua/compatibility.
A c-wire, or “common wire”, is required for heat only, cool only & heat pump
applications. You can learn more about installing a c-wire at
sensi.emerson.com/en-us/c-wire.
System Type
Select what type of system you have.
Label Your Wires
Using the provided wire label stickers, label your wires by removing 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.
Install Sensi Base
Use the provided mounting screws and secure the Sensi base to the wall.
Connect the Wires
Once the Sensi base is mounted and secured on the wall, inserthe wires into
the terminals. Simply push the wires into the terminal slots. Use a
screwdriver to secure each wire in place
Attach Cover
Push the front display onto the thermostat base.
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.” The app will jump
right into connecting your thermostat to Wi-Fi.
BROADCAST SENSI NETWORK
On the thermostat, press Menu, and then Mode. The WiFi icon in the upper left-
hand corner will flash, and 00, 11, or 22 will be displayed in the middle of
the thermostat. This determines what Sensi version you have.
CONNECT YOUR SENSI THERMOSTAT TO YOUR WI-FI NETWORK WITH THE SENSI APP
Follow the step-by-step instructions in the Sensi app. The Wi-Fi connection
process will be slightly different based on your device’s operating system
(iOS/Android), Sensi app version, and the version of Sensi thermostat that you
have. If you are connecting with an iPhone/iPad, and you see 11 or 22
displayed on your screen, you’ll have the option to connect your thermostat
with Apple HomeKit.
After connecting to the Sensi network, you’ll enter the Sensi password,
printed on the Welcome Guide (or found on the back of the thermostat face
plate as “Sensi Security Code”). Then you’ll connect to your Wi-Fi network.
Name
Thermostat
You can select a name or choose a custom name for your thermostat. Press
“Next” to continue.
Register thermostat
After successfully connecting Sensi, the app will prompt you to register the
thermostat. You can either choose the “Locate Me” option or fill in your
street address, city, state, zip code, country and time zone manually. Press
“Next” to continue.
Contractor Information
If a contractor professionally installed your thermostat, and registered as a
Sensi partner, they have the option to input their phone number here. If there
is not a registered number available, simply hit “Next” to continue.
Start
Using Sensi
Congratulations on successfully installing Sensi. Press “Start Using Sensi” to
open the main screen of the app.
TROUBLESHOOTING
Connecting to Wi-Fi Troubleshooting
If you’re having trouble connecting to Wi-Fi, here are some tips to try:
- Make sure the Sensi app is up-to-date and running the latest version available in your app store.
- Reboot your smartphone.
- Reboot your router by unplugging it from the wall for a few minutes and then plugging it back in.
- After 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.
- If you’re on an iPhone, make sure Keychain is On, and Home Data is allowed for the Sensi app.
- If you’re on an Android, go into your phone’s Advanced Wi-Fi Settings and turn off the “Switch to mobile data” feature. (Depending on your Android, it may be called “Smart Network Switch” or “Avoid poor connections.”)
- It may be easier to just turn “Mobile Data” off completely for setup. You can find this in your Connection settings.
- Try another smartphone or tablet. Simply download the Sensi app and sign into the app using the email address and password you used when you created your account.
Reconnecting to Wi-Fi
If you replaced your router or changed your Wi-Fi network password, you will
need to reconnect your thermostat to Wi-Fi. This is different depending on
what smart device you are using. Please see our support article for more
information on how to reconnect.
sensi.emerson.com/en-us/support/reconnecting-sensi-thermostat-to-
wifi
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.
CONFIGURATION MENU ITEMS REFERENCE
Accessing your Sensi thermostat from other devices
When you log into your Sensi account with your email address and password, the
app will be able to control all the thermostats registered to your Sensi
account. If you give someone else your email address and password to your
Sensi account, they will be able to log in and control any thermostats
registered to that account. You can change your email address and password
from inside the app. Be aware of this when giving out your information. There
is no limit to the number of devices that can access the thermostat.
Forgot password
If you forgot the password to your Sensi account, click on “Forgot Password”
on the login screen of the Sensi app. A temporary password will be sent to the
email address that you use to login.
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.
Accessing account information
You can use the Account area to access your email preferences, change your
account information and email address associated with your Sensi.
For iOS: Tap the person icon in the upper right-hand corner.
For Android: Tap the three dots in the upper right-hand corner.
Technical support
For problems connecting your Sensi thermostat, call or email the Sensi
Technical Support team, and they will be happy to help you or your contractor
walk through any steps needed to troubleshoot the Sensi thermostat.
sensi.emerson.com/en-us/support
(888) 605.7131
support@sensicomfort.com
NOTES
SINGLE STAGE OR MULTI-STAGE SYSTEM (NO HEAT PUMP) WITH TWO TRANSFORMERS
† Two transformers systems (separate RC and RH wires), clip internal RC/RH
jumper, located on back of thermostat.
†Internal jumper between RC and RH, located on the back of the thermostat.
Common connection required on Heat-only, Cool-only, or Heat Pump systems.
References
- Thermostat C-Wire Installation | Sensi US
- Sensi Thermostat & Product Support | Sensi US
- Sensi Thermostat & Product Support | Sensi US
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