Emerson SENSI TOUCH 2 1F96U-42WF Series User manual

SENSITM TOUCH 2 SMART THERMOSTAT
Installation guide
Models: 1F96U-42WF series, ST76 series
Version: August 2022 ©2022 Emerson Electric Co. All rights reserved
R-5556

Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 2
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 Touch 2 Smart Thermostat packaging
DOWNLOAD THE SENSI APP
The Sensi Touch 2 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 smart phone or tablet. It is a free download.
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.
Scan the QR code to download the Sensi app
Android, Google Play, and the Google Play logo are trademarks of Google Inc.
DOWNLOADING THE APP AND CREATING AN ACCOUNT

Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 3
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. The Sensi Touch 2
smart thermostat option is for the following model numbers:
- 1F96U-42WF series
- ST76 series
Note: You can check your model number on the back of the thermostat cover.
STEP 2
Is your Sensi thermostat already on your wall?
NEW INSTALLATION
After choosing your Sensi model, tap New Installation. Next, select whether
your thermostat Is Currently Mounted or Not Mounted on the wall.
NOT MOUNTED
This option walks you through a full step-by-step installation process.
You will identify which wires are on your original thermostat, how to label
them for Sensi, how to connect your wires and how to connect to Wi-Fi.
If you did not have this thermostat professionally installed,
choose this option. It will ensure that your thermostat is properly
wired and configured to work with your HVAC system
IS CURRENTLY MOUNTED
This option asks you to identify the wires already installed on your
Sensi Touch 2 to ensure that your HVAC settings
are correct and connects you to Wi-Fi.
If you had a professional technician install your thermostat,
choose this option and skip to STEP 5b.
Pro Tip:
If you are DIYing your installation, always choose Not Mounted to
make sure your thermostat is wired and configured correctly.
INSTALLING THE SENSI THERMOSTAT

Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 4
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.
STEP 3
Remove the old thermostat from your wall
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. 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/system.
Sensi Touch 2 requires a c-wire.
For more information, visit sensi.emerson.com/en-us/support/c-wire.
INSTALLING THE SENSI THERMOSTAT

Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 5
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
INSTALL SENSI BASE
Use the mounting screws provided and secure the Sensi base to the wall.
STEP 5a– NOT MOUNTED
Connect the wiring and thermostat cover
CONNECT THE WIRES
Once the Sensi base is mounted and secured on the wall, insert the
wires into the terminals. Simply push the wires into the terminal slots.
ATTACH THERMOSTAT COVER
Push the thermostat cover onto the base.
TURN ON POWER
Turn the power to your system back on.
INSTALLING THE SENSI THERMOSTAT

Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 6
STEP 5b– IS CURRENTLY MOUNTED
Identify the wires already installed to correctly
configure the thermostat for your system type
TURN OFF POWER
Turn off power to your heating and air conditioning
system before handling your thermostat wires.
REMOVE THERMOSTAT COVER
Grab the thermostat with both hands and pull straight
toward you. The cover will detach from the base.
IDENTIFY WIRES
Choose the labels on your thermostat base that have wires attached to them.
The Sensi Touch 2 requires a c-wire, so make sure one is installed.
SELECT FURNACE TYPE
Identify which type of heating source you have.
ATTACH THERMOSTAT COVER
Push the thermostat cover onto the base.
TURN ON POWER
Turn the power to your system back on.
STEP 6
Connecting to Wi-Fi and registering
your thermostat
CONNECTING TO WIFI
After wiring and installing the thermostat, you’re ready to connect to Wi-Fi.
Pro Tip:
If the thermostat screen is not turning on after wiring installation,
you may have an issue with your c-wire connection. The c-wire
powers the thermostat, and it won’t turn on without it. See the
troubleshooting section on pg. 9 for more information.
INSTALLING THE SENSI THERMOSTAT

Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 7
WIFI SETUP
On the thermostat, press Menu in the top left
corner and then Wi-Fi. Tap Connect.
SCAN QR CODE
In the app, scan the QR code on your Sensi Touch 2 screen. Bluetooth
technology will help you connect to Wi-Fi. This will require Bluetooth
permissions on your phone. You can turn on Bluetooth in your phone’s settings.
If you’re having trouble scanning, tap Use Security PIN
to manually enter the code on your touchscreen.
SELECT YOUR WIFI NETWORK
In the list of available networks, select your home Wi-Fi network
and then enter your home Wi-Fi network password.
Pro Tip:
Sensi is only compatible with 2.4GHz networks. If your network does not
show up in the list, it is either hidden or not compatible with Sensi.
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 OPTIONAL
If a contractor professionally installed your thermostat and is 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.
INSTALLING THE SENSI THERMOSTAT

Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 8
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.
― If you pull on a wire, it should not come out. Make sure the wire is all the way down
and seated in the thermostat terminals. If you aren’t sure, push the paddle down and
pull the wire out. Then, try to push it back into the terminal for a better fit.
• Ensure the thermostat is wired correctly by following the instructions in the Sensi app.
― You can also try to reinstall your original thermostat to make sure there is not an HVAC system issue
that is preventing the system from turning on. If your heating/cooling doesn’t come on with the original
thermostat, you may need to contact a professional technician to service your equipment.
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.
• Make sure Bluetooth is turned on in your phone settings and is allowed in the Sensi app permissions.
• Make sure Location access is turned on in your phone settings and is allowed in the Sensi app permissions.
• 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 process 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
TROUBLESHOOTING

Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 9
Blank or flashing display
If you installed a Sensi Touch 2 smart thermostat, but the touchscreen is still blank or only
flashes after completing all the steps in the Sensi app, then the thermostat is most likely not
receiving enough power from your system to turn on or stay on continuously.
Sensi Touch 2 requires a c-wire to power the thermostat.
I DON’T HAVE A WIRE IN THE “C” TERMINAL.
Sensi requires a c-wire. If you don’t have a wire in the “C” terminal, check out our
c-wire videos for DIY installation at sensi.emerson.com/en-us/c-wire.
If you are installing Sensi to a heat-only system, you may be able to install an external transformer. Learn
more about that option by searching “external transformer” on our support site at sensihelp.com.
I HAVE A WIRE IN THE “C” TERMINAL.
Did you DIY this c-wire connection? If so, make sure that this wire is connected
to “C” terminal at the thermostat and at your system.
1. Go down to your indoor HVAC unit furnace/air handler, reveal your system’s control board and trace the c-wire
at the thermostat to ensure that it is securely connected to the “C” terminal at the system control board. If
you haven’t already, it may help to watch one of the c-wire videos to see how to access the control board.
2. Gently tug the c-wire at the system control board to ensure that it is screwed into the terminal securely.
3. Gently tug all the wires at the thermostat to ensure that they are secure in the terminal block on the sub-base.
4. Do you have a voltmeter? Set your voltmeter to AC and measure the voltage between
RH (or RC) and C at the thermostat to ensure that you have between 20–30VAC at the
thermostat. If you have less than 20VAC, the thermostat will not turn on.
5. Are your breakers on? You turned your power off for installation. Make sure the power is
turned on. You may want to try resetting them if they’re already turned on.
TROUBLESHOOTING

Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 10
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:
sensi.emerson.com/en-us/support/how-
do-i-configure-my-thermostat
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 the
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 forget 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 log in.
CONFIGURATION MENU ITEMS REFERENCE
Menu item Description Options
Outdoor Equipment Select AC or Heat Pump
equipment, as well as
the number of stages.
Set this to AC1 for
single-stage systems or
HP1 or HP2 for single or
multi-stage heat pumps
AC1/AC2/HP1/
HP2/None
Indoor Equipment Select whether the
equipment is an electric
or gas furnace or fan
only. Set this to EL1 for
single- stage electric or
GA1 or GA2 for single or
multi-stage gas systems.
GA1/GA2/EL1/
EL2/Fan
Reversing Valve
Position When configured for O, the reversing valve is
energized in cooling.
This will cover most
applications. Some
manufacturers, such as
Rheem or Rhudd, use the
B terminal, which would
energize in heating. For
three-wire zone hydronic
systems, set this to Z.
O/B/6/None
Additional
Accessories
Humidifier
(wired to
thermostat)
If a humidifier is wired to
the thermostat, change the
Humidifier setting to YES.
Yes/No
Dehumidifier
(wired to
thermostat)
If a dehumidifier is
wired to the thermostat,
change the Dehumidifier
setting to YES.
Yes/No
NOTES

Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 11
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.
For iOS: Tap the person icon in the upper right corner.
For Android: Tap the three dots in the upper right corner.
Technical support
For problems installing your Sensi thermostat, visit our support site. We have
a vast collection of troubleshooting articles aimed at helping you install Sensi
and using its features. We also have a support team available to help assist you.
sensihelp.com
[phone]
NOTES

Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 12
CONVENTIONAL SINGLE-STAGE OR MULTI-STAGE SYSTEMS (NO HEAT PUMP)
System
configuration
Thermostat
†
†
Two transformers systems (separate RC and RH wires), clip internal RC/RH jumper, located on back of thermostat.
HOT
120 VAC
NEUTRAL
HOT
120 VAC
NEUTRAL
NEUTRAL
24 VAC
HOT
NEUTRAL
24 VAC
HOT
Cooling transformerHeating transformer
Dots indicate
phased
relationship
Dots indicate
phased
relationship
Single-stage
(AC1, GA1, EL1)
Power for cooling (24V)
Power for heating (24V)
Common wire (24V)
1st-stage cool
Indoor blower (fan) energized
on call for fan, cool or electric heat
Heat pump changeover, zone panel or
3-wire hot water zone valve connection.
(configurable as O, B or 6
in the installer menu)
1st-stage heat
2nd-stage cool
Multi-stage
(AC2, GA2, EL2)
2nd-stage heat Dehumidifier
HEAT PUMP SYSTEMS
System
configuration
Thermostat
††
†
Internal jumper between RC and RH, located on back of thermostat.
††
Common connection required on heat-only, cool-only or heat pump systems.
HOT
120 VAC
NEUTRAL
NEUTRAL
24 VAC
HOT
Dots indicate
phased
relationship
†
Heat pump
Single-stage
HP1
Power for cooling (24V)
Power for heating (24V)
Common wire (24V)
1st-stage heat and cool compressor
Indoor blower (fan) energized
on call for fan, cool or heat
Heat pump changeover (reversing valve)
connection (configure as O or B
in the installer menu)
2nd-stage heat and
cool compressor
2nd-stage auxiliary/
emergency heat
(3rd-stage heat)
Heat pump
Multi-stage
HP2
1st-stage auxiliary/
emergency heat
(3rd-stage heat)
1st-stage auxiliary/
emergency heat
(2nd-stage heat)
2nd-stage auxiliary/
emergency heat
(4th-stage heat)
NOTES

Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 13
ACCESSORY DEVICE
2-Wire accessory
Device has it’s own power
source to turn the unit on.
Set switch on the back of
the thermostat to “Accessory.”
Thermostat Accessory
Thermostat Accessory
1-Wire accessory
Device pulls power from the
HVAC system. Set switch on the
back of the thermostat to “System.”
ACC+
ACC-
ACC+
Wire 1
Wire 2
24V
24VAC switch
Accessory
System
NOTES