Emerson Sensi Smart Thermostat Pro Installation Guide
PRO Installation
Thermostat
Smart
1
Designed by the pros for the pros
There are a lot of choices when it comes to buying a thermostat,
but only one combines 125 years of 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.
Sensi partner program
Always be the Contractor-On-Call with your customers.
The Sensi app saves your contact information so when your
customer needs service, you’re just a tap away. Register at
www.sensiregistration.com.
Need help?
Visit sensicomfort.com/support 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
support@sensicomfort.com
2
Easy to install and connect
Sensi is designed to install like a standard thermostat. It
gives you the flexibility to connect to Wi-Fi at installation
or let your customer connect it later using the Sensi app.
MOBILE DEVICE COMPATIBILITY
OPERATING SYSTEM COMPATIBILITY
iOS Yes
Android Yes
Amazon Fire Yes
SMART HOME PLATFORM COMPATIBILITY
OPERATING SYSTEM COMPATIBILITY
Amazon Alexa Yes
Google Assistant Yes
Apple HomeKit
Wink Yes
Yes, but requires a
common wire (c-wire)
3
HVAC SYSTEM COMPATIBILITY
SYSTEM TYPE COMPATIBILITY MODIFICATIONS
Conventional heating and
cooling
• Gas furnace
• Air conditioner
• Electric furnace
• Boiler
Heat only
• Gas furnace
• Electric furnace
• Boiler
Cool only
• Air conditioner
Heat pump Yes Requires a common
Communicating
proprietary systems
Line voltage No Requires low voltage
Millivolt systems No Requires 20-30VAC
Yes None
Yes Requires a common
wire (c-wire)
Yes Requires a common
wire (c-wire)
wire (c-wire)
No Needs standard HVAC wiring
(20-30VAC)
4
What’s in the box?
• Sensi Thermostat
• Screws and Anchors
• Wire Labels
• 2 AA Batteries
• Sensi Security Code
(found on the back of the Welcome Guide)
Items needed for Wi-Fi connection:
• The homeowners compatible iOS or Android device
with the Sensi app installed and registered
• Your customer’s Wi-Fi network name (SSID) and password
QUICK TIP: Ask the homeowner to download the
Sensi app and gather their Wi-Fi information
while you are installing the thermostat.
5
Installation
1. Install Sensi thermostat, referring to these terminal
definitions, cross references and wiring diagrams as needed:
OLD
THERMOSTAT
RH RH
RC, R RC
SENSI
THERMOSTAT
†
†
CONVENTIONAL
SYSTEM
Power for heating, 24V
Power for cooling, 24V
HEAT PUMP SYSTEM
C, X, B** C Common wire, 24V
Y, Y1 Y 1st stage cool
Y2 Y2/*
W, W1, W/E,
Aux/E, E
†††
W2
W/E 1st indoor stage heat
W2/*
2nd stage cool
or humidifier
2nd indoor stage
heat or dehumidifier
1st outdoor
stage heat
2nd outdoor stage
heat and cool
or humidifier
1st stage auxiliary/
emergency heat
2nd stage auxiliary/
emergency heat
or dehumidifier
G G Indoor blower (fan)
O,B,†† O/B O/B
L L no function
†
Two transformer systems (separate RC and RH wires), clip internal jumper located
on back of Sensi above battery compartment.
††
Label “B” as “C” only if the old thermostat al so had a wire in “O”. If there is no wire
on “O”-label the wire “B”.
†††
On Heat Pump system with separate W2 and E wires, label both wires W/E
(2 wires in one terminal).
Changeover (reversing valve) connection
for heat pump or zone panel systems
“L” terminal
connection
6
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.
O
Energized
Blower
in Cool
Constantly
Circulator
Fan
Heat
Pump “L”
Mode
(Factory
Default)
Energized
On Call
For Cool
Terminal
Connection
B
Energized
(And Heat
If Confi-
In Heat
Mode (Or
Constantly
gured
For Electric
Heat)
Aux Mode)
Dots Indicate
Phased
HOT
Relationship
NEUTRAL
120 VAC
24 VAC
NEUTRAL
HOT
Cooling TransformerHeating Transformer
Thermostat
Heat
Mode
Cool
24 Volt
24 Volt
24 Volt
1st Stage
Mode
1st stage
(Common)
Heat
(Hot)
Cool
(Hot)
Multi-
Stage
De-
humidifier
Humidifier
AC2
GA2
†
NEUTRAL
24 VAC
EL2
Dots Indicate
HOT
Phased
Relationship
HOT
120 VAC
NEUTRAL
Heat
Mode
2nd Stage
Cool
Mode
2nd Stage
†
EL1
AC1
GA1
Stage
Single
System
Configuration
7
HEAT PUMP SYSTEMS
Common connection required on Heat-only, Cool-only or Heat Pump systems.
NEUTRAL
O
Energized
Blower/
Mode
in Cool
Constantly
Circulator
Fan
Heat
Pump “L”
(Factory
Default)
Energized
On Call
For Cool
Terminal
Connection
B
(And Heat If
In Heat
Energized
Constantly
Configured
For Electric
Heat)
Mode (Or
Aux Mode)
Dots Indicate
Phased
Relationship
HOT
120 VAC
24 VAC
NEUTRAL
HOT
8
Thermostat
††
†
System
Configuration
Single
Heat
Mode
Cool
Mode
Heat And
Cool Mode
Heat
Stage
2nd Stage
2nd Stage
1st Stage
Pump
(Com-
HP1
Heat
Mode
pressor)
24 Volt
(Hot)
24 Volt
(Hot)
24 Volt
1st Stage
NOTE: Dual
Fuel Option
(Common)
Heat
Cool
Multi-
De-
Humidifier
Heat Mode
De-Energizes
Heat
Stage
humidifier
1st Stage
HP2
Pump
Internal jumper between RC and RH, located on back of thermostat.
†
††
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