Emerson sensi ST76 Series Touch 2 Smart Thermostat
The Sensi Touch 2 Smart Thermostat can be operated via Wi-Fi with the Sensi app or it can be operated on the actual wall unit. Advanced functions such as thermostat settings, scheduling and email alerts are only available through the Sensi app.
- MENU Access thermostat settings and add sensors.
- SENSOR PARTICIPATION See how many sensors the thermostat controls.
- PLUS BUTTON Adjusts the temperature set point up and down.
- CURRENT SET TEMPERATURE Current set temperature that the thermostat will maintain.
- MINUS BUTTON Adjusts the temperature setpoint
- CURRENT TEMPERATURE The room temperature in the thermostat. If you have connected sensors, the temperature displayed is the average of the selected sensors and the thermostat.
- HUMIDITY Shows current humidity.
- FAN AND SYSTEM MODES Toggle system mode between Heat, Cool, Off, Aux or Auto. Toggles fan mode from Auto or On, and allows Circulate Fan customization. Leave the fan mode on auto so that the thermostat can control the fan as needed.
- TIME Shows current time.
FASHION SELECTION
Switching system MODE
Press the Mode button (see Buttons and Icons) to toggle between all available system mode settings.
off
When System Mode is Off, your HVAC system will not heat or cool your home.
Auto
Auto mode allows the thermostat to seamlessly switch between your heating and cooling systems by setting two temperature setpoints, and the thermostat will maintain your room temperature between these two temperatures.
Example: Set to 75° and 70°F – Sensi turns on your cooling system when the room temperature is 75°F or higher, and turns on your heating system when the room temperature is 70°F or lower.
Aux
If you have a heat pump with back-up auxiliary heat, Sensi automatically switches between the heat pump and backup heat in Heat Mode. If you only want to heat your home with your backup heating system, switch the mode to Aux.
FAN MODE
If you want to circulate indoor air, you can switch the fan mode to On. Turn the fan back to auto if you want the thermostat to control your indoor blower as needed. Leaving the fan on will run your blower continuously Circulate Fan mode allows your blower to run for a set amount of continuous minutes each hour without running your HVAC system. For more information visit sensi.emerson.com/en-us/support/circulating-fan
HOLDING A TEMPERATURE
If you want to hold a temperature, make sure the schedule is off. Then adjust the set point using the plus and minus buttons. The thermostat will maintain this temperature, in set system mode, until you reset the schedule or until you adjust the set point again with the plus and minus buttons
You can go to different settings and options about your thermostat in the menu.
REMOTE SENSORS
If you have a remote sensor to pair with your thermostat, you can do so in this menu, as well as view general information about your sensor(s). If you want to manage your sensors, you must do so via the Sensi app.
DISPLAY options
Change what you want to see on the display of this menu.
Home Screen Contents Change the temperature from Fahrenheit to Celsius and adjust if you can see the humidity/time on the thermostat here.
Sleep mode
You have the option to show different settings when the touchscreen is asleep.
SCHEDULE
You can schedule on/off of the thermostat
Temporary Hold
When your schedule is On, your Sensi Thermostat will control your home based on the time and temperature settings in the current schedule. To temporarily change your temperature, use the up and down arrows in the app or the plus and minus buttons on the thermostat. Your thermostat will show hold and the time until the hold expires. It holds your new temperature until the next scheduled set point with a minimum holding time of two hours
ABOUT THERMOSTAT
This menu shows a quick look at your thermostat information. It includes your model number, MAC ID (uniquely identifies your thermostat), build date, firmware version, technical support contact information, and a factory reset button. Pressing the Factory Reset button will clear all your settings except the HVAC equipment settings and temperature limits
WIFI
The Sensi app teaches you how to connect to Wi-Fi. You can also turn Wi-Fi on or off at any time. If you are connected to Wi-Fi, you can view the name of the network you are connected to, as well as the signal strength of the network in this menu.
ADVANCED SETUP
Here you can control the HVAC settings and adjust your humidification settings if you have an accessory installed. (Humidification setting is recommended for a contractor only.)
HVAC Equipment
This allows you to change a series of settings to customize the thermostat for your specific system. See the table below for a complete list of thermostat configurations and what they stand for. If you want to install the thermostat for the first time, we recommend that you download the Sensi app and follow the installation instructions.
However, if you have a problem or want to check your system configurations, you can also configure your thermostat manually. Learn more about how to properly configure your thermostat sensi.emerson.com/en-us/support/how-do-i-configure-my-thermostat
Date and time
When you connect Sensi to Wi-Fi, this is automatically set based on your time zone. If you need to set it manually, tap Change and adjust as needed. This option is only available when Wi-Fi is turned off
CONTRACTOR INFORMATION
If your thermostat was installed by a professional who is part of our Sensi Partner Program, their information may be displayed on your thermostat in case you need their contact information handy.
See below for a list of all the settings available on the thermostat and their options.
| CONFIGURATION MENU ITEMS REFERENCE | ||
| ITEM MENU | Options | DEFAULT |
| Remote sensors | Add/delete sensors | |
| Display options | Home Screen Contents | Sleep mode | |
| Sleep mode | Time for sleep screen brightness display time display setpoint | 1 min. Med On Op |
| Home screen content | Indoor humidity time of day°F / °C | On An°F |
| schedule | On/Off (Create and edit schedule on the app) | – |
| Wifi | Connect/Reconnect/Forget Networki | – |
| About thermostat | Model Number / Reset | – |
| Advanced setup | HVAC Equipment | Accessory setup | time and date | |
|
Set up HVAC equipment |
Outdoor Setup AC1/AC2/HP1/HP2/None Indoor Setup GA1/GA2/EL1/EL2/Fan Reversing Valve Position O/B/6/None Additional Accessories None/Add Humidifier (wired to thermostat) Yes/No Dehumidifier (wired to Thermostat) Yes/No | AC2 EL2 ONo no
No |
| Fan mode options | Circulating Fan Off/On10% – 100% (5% increments) General Fan On / Auto | started |
| humidity | Humidification Off/On 5% – 50% (5% increments) | 40% Off |
| Dehumidify | Dehumidification Off / On 40% – 95% (5% increments) | 50% Off |
QUESTION
See below for definitions of the cable terminals on the bottom base of the thermostat
terminal outputs and wiring diagrams
| TERMINAL LABEL | DEFINITION |
| HR* | Electricity for heating, 24V |
| RC* | Current for cooling, 24V |
| C** | Common wire, 24V |
| G | Indoor blower (fan) |
| Y | First outdoor stage cools on conventional systems or first heat and cools on heat pump systems |
| Y2 / * | Second outdoor stage cools on conventional systems or second heat and cools on two stage heat pump systems |
| W/E | First indoor stage heat on conventional systems or first stage auxiliary/emergency heating on heat pump systems |
| W2 / * | Second stage indoor heat on conventional systems or second stage auxiliary / emergency heating on heat pump systems / dehumidifier |
| O/B | Switch (return valve) connection for heat pump or zone panel systems |
| acc- | Used to control a whole home humidifier with two wires and set the dry contact switch on the back to accessory. |
| ACC+ | Used to control a whole home humidifier with a single wire. Make sure the switch is on the back in the system position |
If the old thermostat has separate RC and RH wires coming out of the wall, clip the RC/RH jumper on the back of the thermostat.** The common wire might be marked “C” on your old thermostat, or it might be marked “B” or “X.” Please refer to the manual of your old thermostat for clarification. Does the wire color match the thermostat terminals? The color of the wire does not always correspond to the thermostat letters. A white wire can be attached to the “W” terminal on the old thermostat, or it can be attached to another terminal with a different letter. Be sure to take a photo of the old thermostat showing the wire colors and terminal letters before marking and removing the wires.
Thermostat back
TROUBLESHOOTING
Why can’t I control the thermostat on the touch screen?
If Keypad Lockout is enabled through the Sensi app, the touchscreen will be locked, and you can only make changes through the Sensi app. When the screen is locked, you will see a padlock icon at the top of the thermostat touchscreen Why can’t I adjust the temperature setpoint beyond a certain degree? Sensi Touch 2 has a set point range of 45° to 99°F. You cannot set the thermostat lower than 45°F or higher than 99°F. If the temperature limits are enabled through the Sensi app, then a custom setpoint range is set, and you cannot go above the “Heating Max Setpoint” and you cannot go below the “Cooling Min Setpoint”. The app will show “Limit” next to the setpoint when you’ve gone as high/low as the custom range allows
Why is my thermostat heating/cooling above the setpoint
Set fan to auto
- Set your thermostat fan to auto. If the thermostat was set to Fan On, it may sound like your system is heating/cooling, but it was just the fan
Check the thermostat functions you have activated
- Turn off the circulating fan.
- Turn off all humidity control functions. If your thermostat is cooling due to overcooling, the thermostat will cool down 3° below your setpoint
Check your cycle rate. (Only available through the Sensi app.)
- When the thermostat is set to “Slow”, there is a greater variance for cooling/heating, and you may see the room temperature briefly go below/above the setpoint before the system shuts down.
Turn off the system mode
- If the heating/cooling system turns off after this change, the thermostat will work as expected. Double check that you don’t have any features that keep the system running longer than usual and check your cycle rate.
If the heating/cooling system does not turn off after changing the mode, reset the thermostat and check that your wiring and configuration are correct
- Use the Factory Reset button in the About Thermostat menu to reset your Touch 2.
- In the Sensi app, go back through the path “Reinstall” > “Not installed” and connect to Wi-Fi again.
IS SHUTTLE ON
Sensi comes pre-programmed with a standard plan. If you haven’t changed the schedule through the app, turn off the schedule
DO YOU USE ANY SMART HOME AUTOMATION?
Check your Alexa or Google Home app to make sure there are no automations set up for your thermostat. Someone in your home can also use voice commands to change the temperature
ARE YOU REGISTERED FOR ACTIVE SAVING EVENTS FROM YOUR ENERGY COMPANY?
You may be in an Active Savings event through your energy company. The thermostat touchscreen displays a notification while you are in an Active event. You can adjust the setpoint with the plus/minus buttons at any time to terminate this event.
DO YOU USE GEOFENCING?
When geofencing is enabled, Sensi will adjust setpoints based on whether you’re home or away for each person opted in through the app. If not everyone is at home, the setpoint could be affected
Why is my touchscreen blank?
Sensi Touch 2 requires a “C” (common) wire to power up the screen. If the thermostat does not turn off or the display is blank, there is probably no power to the thermostat.
- Make sure there is power to your HVAC system and that there is no error code on your control board, indicating a system problem.
- If there is an error code or no power to your system, contact an HVAC professional to service your equipment.
- Reset breaker.
- Secure wire connections.
- If you pull on a wire, it won’t come out. Make sure the wire is all the way down and seated in the thermostat terminals. If you are not sure, push the paddle down and pull
- he wires out. Then try pushing it back into the terminal for a better fit.
- Make sure the thermostat is wired correctly by following the instructions in the Sensi app.
Why is my heating/cooling not turning on?
Just installed thermostat
- Make sure there is power to your HVAC system and that there is no error code on your control board, indicating a system problem.
- If there is an error code or no power to your system, contact an HVAC professional to service your equipment.
- Reset breaker.
- Secure wire connections.
- If you pull on a wire, it won’t come out. Make sure the wire is all the way down and seated in the thermostat terminals. If you are not sure, push the paddle down and pull
- the wire out. Then try pushing it back into the terminal for a better fit.
- Make sure the thermostat is wired correctly by following the instructions in the Sensi app.
- You can also try reinstalling your original thermostat to make sure there isn’t an HVAC system problem that is preventing the system from coming in. If your heating/cooling unit does not come with the original thermostat, you may need to contact a professional technician to service your equipment.
Installed thermostat before, works fine
- Make sure there is power to your HVAC system and that there is no error code on your control board, indicating a system problem.
- If there is an error code or no power to your system, contact an HVAC professional to service your equipment.
- Reset breaker.
- Reset thermostat.
- Use the Factory Reset button in the About Thermostat menu to reset your Touch 2.
- Make sure the thermostat is wired correctly by following the instructions in the Sensi app.
- You can also try reinstalling your original thermostat to make sure there isn’t an HVAC system problem that is preventing the system from coming in. If your heating/cooling unit does not come with the original thermostat, you may need to contact a professional technician to service your equipment.
- Make sure the thermostat is configured correctly for your HVAC system.
REFERENCE:
Download Manual: sensi ST76 Series Touch 2 Smart Thermostat User Manual
https://device.report/energystar/2398136
Emerson sensi ST76 Series Touch 2 Smart Thermostat – Energy Star Certification
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