sensi ST75 Touch Smart Thermostat Installation Guide
- June 6, 2024
- sensi
Table of Contents
Installation Guide
Download the Sensi app before you begin.
This document is not meant to be used independently or to replace the step-by-
step installation procedure found only in the Sensi app. The app is required
for installation to ensure proper configuration and enable Wi-Fi control of
your thermostat.
The free Sensi mobile app is available on the App Store™ and Google Play™.
Simply scan the QR code or search for “Sensi” to download and get started.
Easy start guide
CREATE YOUR ACCOUNT.
Open the Sensi app on your device and follow the prompts to create an account,
using a valid email address.
Your Sensi account can only be linked to one email address, but you can share
your account information across devices so your whole family can have access.
INSTALL YOUR THERMOSTAT.
The Sensi app will walk you through removing your old thermostat from the
wall, labeling your existing wires, and installing your new Sensi thermostat.
CONNECT TO WI-FI.
After installation, the app will walk you through connecting your new
thermostat to your home Wi-Fi network. Remember to have your Wi-Fi network
name, password and Sensi password ready.
REGISTER YOUR THERMOSTAT.
Finally, the app will walk you through registration so you can start
controlling your home comfort.
Anytime. Anywhere.
For detailed instructions go to
sensi.emerson.com/install
What’s in the box?
- Sensi Thermostat
- Screws and Anchors
- Wire Labels
- Welcome Guide
Here’s what you’ll need.
Things you’ll definitely need:
- Medium Phillips screwdriver
- Compatible iOS or Android device with the Sensi app installed
- Your email address
- Your Wi-Fi network with 802.11n 2.4 GHz band
(Sensi thermostats cannot connect to 5 GHz band networks), Wi-Fi network name (SSID) and password
Things you might need:
- Needle-nose pliers
- Drill with 3/16” bit
- Wire stripper
You’re just a few steps away from complete comfort control.
Never installed a thermostat before? We’ve got you covered. Sensi™ Touch Smart Thermostat was designed for a quick and easy DIY installation. The Sensi app provides step-by-step instructions and helpful videos to get you up and running in no time.
Compatibility
Not only does Sensi work with the HVAC equipment in most homes, but it also
works with most mobile devices and smart home platforms.
Check out the information below, to make sure the Sensi thermostat will work
for you:
MOBILE DEVICE COMPATIBILITY
| OPERATING SYSTEM | COMPATIBILITY |
|---|---|
| iOS 10.0 or later | Yes |
| Android 5.0 or later | Yes |
| Amazon Fire | Yes |
SMART HOME PLATFORM COMPATIBILITY
Please refer to sensi.emerson.com for the most up-to-date smart home
information.
ROUTER COMPATIBILITY
| ROUTER TYPE | COMPATIBILITY |
|---|---|
| Single-band router with 2.4 GHz band | Yes* |
| Dual-band router with 2.4 GHz & 5.0 GHz bands | Yes* |
| Single-band router with 5.0 GHz band | No |
Sensi thermostats require an 802.11n 2.4 GHz Wi-Fi network and are compatible
with most residential Wi-Fi networks, however, there are some known
incompatible routers. Visit sensi.emerson.com/support and search “router
compatibility” for a list of known incompatible routers.
HVAC SYSTEM COMPATIBILITY
| SYSTEM TYPE | COMPATIBILITy | MODIFICATIONS |
|---|
Conventional heating and cooling
• Gas furnace
• Air conditioner
• Electric furnace
• Boiler| Yes| Requires a common wire (c-wire)
Heat only
• Gas furnace
• Electric furnace
• Boiler| Yes| Requires a common wire (c-wire)
Cool only
• Air conditioner| Yes| Requires a common wire (c-wire)
Heat pump| Yes| Requires a common wire (c-wire)
Communicating proprietary
systems| No| Needs standard HVAC wiring
Line voltage| No| Requires low voltage (20-30VAC)
Millivolt systems| No| Requires 20-30VAC
Energy efficiency is made simple.
ENERGY STAR® is the simple choice for energy efficiency. Save energy, save money and protect the environment with the ENERGY STAR® certified Sensi thermostat.
Warnings
INSTALLER INFORMATION
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR
OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE.
WARNING
WARNING: OUT OF PHASE TRANSFORMERS
On two transformer systems, the transformers MUST be in phase. Measure the
voltage across RC and RH. If more than 12 Volts AC is present between RC and
RH, then the transformers are NOT in phase.
To correct this condition, reverse the secondary low voltage connections at
either the Heating or Cooling transformer.
WARNING
VOLTAGE REQUIREMENTS
Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause shock or fire hazards.
Thermostat installation and all components of the control system shall conform
to Class II circuits per the NEC code.
CAUTION
CAUTION: E5 Alert
If “Call For Service” is displayed on your Sensi thermostat, and E4 or E5
appears where the room temperature should be displayed or the backlight is
flashing, please call our support team immediately at 888.605.7131
ATTENTION: MERCURY NOTICE
This product does not contain mercury. However, this product may replace a
product that contains mercury. Mercury and products containing mercury must
not be discarded in household trash. Refer to thermostat-recycle.org for a
location to send products containing mercury.
WARNING
FOR CALIFORNIA RESIDENTS: WARNING:
This product contains a chemical known to the state of California to cause
cancer and birth defects and other reproductive harm.
Need some help?
Visit sensi.emerson.com/support for access
to support articles, instructional downloads, and comprehensive support
videos. Our highly-trained Sensi Support Team is available seven days a week.
1.888.605.7131
support@sensicomfort.com
www.sensi.emerson.com
The Emerson logo is a trademark and service mark and the Sensi logo is a
trademark of Emerson Electric Co.