sensi Lite Zigbee Smart Thermostat
Specifications
- Designed for professional-grade HVAC systems
- Compatible with conventional heating and cooling systems, heat pumps, but not with communicating proprietary systems or line voltage systems
- Supports smart home connectivity via Zigbee or Zwave smart home hubs
Designed by the pros for the pros
There are a lot of choices when it comes to buying a thermostat, but only one combines 100 years of HVAC experience and the latest connected home technology to empower your customers to take control of their comfort from anywhere. We proudly connect you to a professional-grade thermostat that you can offer your customers with confidence and that will keep you connected with them even after the initial install.
Need help?
Visit sensihelp.com for around-the-clock 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
Easy to install and connect
Sensi is designed to install like a standard thermostat. It gives you the flexibility to connect to your Zigbee or Zwave smart home hub.
SMARTHOME PLATFORM COMPATIBILITY
For the latest smarthome compatibility, check sensihelp.com/smarthome.
update smart home compatibility site
HVAC SYSTEM COMPATIBILITY
| SYSTEM TYPE | COMPATIBILITY | MODIFICATIONS |
Conventional heating and cooling
| Yes | |
Heat only
| Yes | Common wire required |
Cool only
| Yes | Common wire required |
| Heat pump | Yes | Common wire required |
| Communicating proprietary systems | No | Needs standard HVAC wiring |
| Line voltage | No | Requires low voltage (20–30VAC) |
| Millivolt systems | No | Requires 20–30VAC |
What’s in the box?
- Sensi Lite smart thermostat – Zigbee + Zwave
- Screws and anchors
- Welcome guide
- Wire labels
- (2) AAA batteries
Things you’ll need:
- The homeowner’s compatible iOS or Android device with the smart hub app
- Your smart hub network name and password
- Medium Phillips screwdriver
- Installation QR code (on back of welcome guide and thermostat)
Installation
Install the Sensi Lite smart thermostat – Zigbee + Zwave by referring to these terminal definitions, cross references and wiring diagrams as needed:
| SENSI THERMOSTAT | CONVENTIONAL SYSTEM CONNECTION | HEAT PUMPSYSTEM CONNECTION |
| R | 24VAC power from HVAC system | |
| O/B/* | 2nd-stage heating or 2nd-stage cooling, zone panel or3-wire zone valve connection (configurable as O, B, Multi-stage or 6 in the installer menu) | Heat pump changeover (reversing valve) connection (configure asO or B in the installer menu) |
| Y | 1st-stage cool | 1st-stage heat and cool(compressor) |
| G | Indoor blower (fan) | Indoor blower (fan) |
| W/E | 1st-stage heat | 1st-stage auxiliary/emergency heat (2nd-stage heat) |
| C | Common wire, 24V | Common wire, 24V |
Two transformer systems (separate RC and RH wires) are not compatible
CONVENTIONAL SINGLE-STAGE OR MULTISTAGE SYSTEMS NO HEAT PUMP
HEAT PUMP SYSTEMS
Configuration
Configure the thermostat to the appropriate system type. To get into the configuration menu, press and hold the three dots on the thermostat for 8 seconds. Navigate options within a step by tapping the up/down arrows. Confirm selection and move to the next step by tapping the three dots.
Step 1: Select your outdoor equipment
- AC (Air condition) DEFAULT
- HP (Heat pump)
- – (None)
Step 2: Select your indoor equipment
- EL (Electric) DEFAULT
- GA (Gas)
- Fn (Fan)
Step 3: Select additional configuration for O/B* terminal
- 2H (2-stage heating) DEFAULT
- 6 (3-zone valve)
- 2C (2-stage cooling)
- O (Reverse Valve Position – Cool)
- B (Reverse Valve Position – Heat)
- – (None)
Step 4: Select fan settings
- AU (Auto)
- ON (Fan runs continuously)
- 10–95 (% of run time per hour)
Step 5: Select temperature unit
- °F (Fahrenheit)
- °C (Celsius)
Step 6: Press and hold the three dots for four seconds to exit the menu.
Refer to these menu options as needed:
| CONFIGURATION MENU ITEMS REFERENCE | ||
| Menu item | Description | Options |
| Outdoor Equipment | Select AC or Heat Pump equipment | AC/HP/– |
| Indoor Equipment | Select whether the equipment is an electric or gas furnace, or fan-only. Set this to EL for single-stage electric for GA single-stage gas systems or FN for fan only systems | GA/FN/EL |
| Reversing Valve or Multistage 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 6. | O/B/2H/2C/6/– |
| Multistage Equipment | When configured for 2C, second-stage cooling is energized. When configured for 2H, second-stage heating is energized. | 2H/2C/6/– |
System testing
Once the thermostat is installed and properly configured, you can test the equipment using the following steps.
Cooling system
- Tap the 3 dots on the thermostat until you select the cool mode (shown as
). - Tap ∨ and adjust the setting to 1° below the current room temperature. The blower should come on immediately on high speed, followed by cold air circulation. The word ON will also appear below the icons on the thermostat display. Note that there can be up to a 5-minute delay for this process.
- Tap ∧ and adjust the setting to 1° above the current room temperature. The cooling system should stop operating.
- If you encounter any issues while testing the equipment, refer to the troubleshooting actions on page 16.
Heating system
- Tap the 3 dots on the thermostat until you select the Heat mode (shown as
). - Tap ∧ on the thermostat and adjust the setting to 1° above the current room temperature. The heating system should begin to operate.
- For heat pumps with auxiliary, tap ∧ and adjust the setting to 3°above the current room temperature. The auxiliary heat should begin to operate and the thermostat will indicate AUX on the screen.
- Press ∨ and adjust the setting to 1° below the current room temperature. The heating system should stop operating and the word ON will disappear from the thermostat display.
Auxiliary system (only for heat pumps with auxiliary)
- Tap the 3 dots on the thermostat until you select the AUX mode (shown asAUX ). This bypasses the heat pump and runs auxiliary-only heat.
- Tap ∧ and adjust the setting to 1° above the current room temperature. The auxiliary heating system should begin to operate. The word ON will also appear below the icons on the thermostat display.
- Tap ∨ and adjust the setting to 1° below the current room temperature. The auxiliary heating system should stop operating and the word ON will disappear from the thermostat display.
Troubleshooting
| SYMPTOM | POSSIBLE CAUSE | CORRECTIVE ACTION |
| No Heat/ No Cool/ No Fan (common problem) |
|
|
| No Heat |
|
|
| No Cool |
|
in Cooling if the AC Protection feature is on. |
| SYMPTOM | POSSIBLE CAUSE | CORRECTIVE ACTION |
| Heat, Cool or Fan Runs Constantly | Possible short in wiring, thermostat, heat, cool or fan system | Check each wire connection to verify they are not shorted or touching other wires. Try resetting the thermostat by pressing and holding all three buttons on the thermostat (up/down arrows + three dots). |
| Thermostat Display & Thermometer Disagree | Thermostat display requires adjustment | Display can be adjusted +/-5° using the Temperature Offset in Sensi app. |
| Humidity Display & Hygrometer Disagree | Humidity display requires adjustment | Display can be adjusted in 5% increments +/- 25% using the Humidity Offset in the Sensi app. |
| Display is Blank | The AAA batteries might need to be replaced or you may need a common wire (c-wire) | Replace the AAA batteries on the back of thermostat or attach a common wire (c-wire). |
| Furnace (Air Conditioner) Cycles Too Fast or Slow | The location of the thermostat and/or the size of the heating system may be influencing the cycle rate | Digital thermostats provide precise control and cycle faster than older mechanical models. The system turns on and off more frequently, but runs for a shorter time. If you would like to increase cycle time, choose Slow for the Cycle Rate in the Sensi app. |
| “Call for Service” Appears on the screen |
|
Reset: Turn the power to your system off, wait 5 seconds and turn it back on. |
| Fan turns on randomly | The fan has been set to run occasionally in the configuration menu | Enter the configuration menu and make sure the fan run time percentage is OFF. |
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
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.
Warning
VOLTAGE REQUIREMENTS
Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard.
Thermostat installation and all components of the control system shall conform to Class II circuits per the NEC code.
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.
FCC Regulations
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
- This device may not cause harmful interference, and
- This device must accept any interference received, including interference that may cause undesired operation.
Changes or modifications not expressly approved by the manufacturer could void the user’s authority to operate the equipment.
The antenna(s) used for this transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
RF Exposure
This device complies with FCC RF radiation exposure limits set forth for an uncontrolled environment.
The antenna(s) used for this transmitter must not be co-located or operating in conjunction with any other antenna or transmitter and must be installed to provide a separation distance of at least 20cm from all persons.
The FCC grant can be found under the Display Grant section of http://www.fcc.gov/oet/fccid after searching on FCC ID: 2A4JN-1F76U22Z.
IC Notice
This device complies with Innovation, Science and Economic Development Canada license-exempt RSS standard(s). Operation is subject to the following two conditions:
- This device may not cause interference, and
- This device must accept any interference, including interference that may cause undesired operation of the device.
This Class B digital apparatus complies with Canadian ICES-003.
IC: 28229-1F76U22Z
IC Radiation Exposure Statement
This device complies with IC radiation exposure limits set forth for an uncontrolled environment. In order to avoid the possibility of exceeding the IC radio frequency exposure limits, human proximity to the antenna shall not be less than 20cm during normal operation.
FAQ
- Q: What do I do if my system type is not listed under HVAC System Compatibility?
A: If your system type is not listed as compatible, it is recommended to consult a professional HVAC technician for further assistance and compatibility verification. - Q: Can I use this thermostat with a line voltage system?
A: No, this thermostat is not compatible with line voltage systems. It is designed for low-voltage HVAC systems only.
Documents / Resources
 | sensi Lite Zigbee Smart Thermostat [pdf] Installation Guide Lite Zigbee Smart Thermostat, Zigbee Smart Thermostat, Smart Thermostat, Thermostat |
