Sensi PRO User manual

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PRO Installation
Smart
Thermostat

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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
[e-mail]

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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 Yes, but requires a
common wire (c-wire)
Wink Yes

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HVAC SYSTEM COMPATIBILITY
SYSTEM TYPE COMPATIBILITY MODIFICATIONS
Conventional heating and
cooling
•Gas furnace
•Air conditioner
•Electric furnace
•Boiler
Yes None
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

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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.

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Installation
1. Install Sensi thermostat, referring to these terminal
definitions, cross references and wiring diagrams as needed:
OLD
THERMOSTAT
SENSI
THERMOSTAT
CONVENTIONAL
SYSTEM HEAT PUMP SYSTEM
RH RH†Power for heating, 24V
RC, R RC†Power for cooling, 24V
C, X, B** C Common wire, 24V
Y, Y1 Y 1st stage cool 1st outdoor
stage heat
Y2 Y2/* 2nd stage cool
or humidifier
2nd outdoor stage
heat and cool
or humidifier
W, W1, W/E,
Aux/E, E W/E 1st indoor stage heat 1st stage auxiliary/ emergency heat
W2††† W2/* 2nd indoor stage
heat or dehumidifier
2nd stage auxiliary/
emergency heat
or dehumidifier
G G Indoor blower (fan)
O,B,†† O/B O/B Changeover (reversing valve) connection
for heat pump or zone panel systems
L L no function “L” terminal
connection
†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 also 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).

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SINGLE STAGE OR MULTI-STAGE SYSTEM (NO HEAT PUMP) WITH TWO TRANSFORMERS
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
24 Volt
(Hot)
Cool
24 Volt
(Hot)
Heat
24 Volt
(Common)
Cool
Mode
1st stage
Blower Circulator Fan Energized On Call For Cool (And Heat If Confi- gured For Electric Heat)
O
Energized
Constantly
in Cool
Mode
(Factory
Default)
B
Energized
Constantly
In Heat
Mode (Or
Aux Mode)
Heat
Mode
1st Stage
Heat
Pump “L”
Terminal
Connection
Humidifier
Heat
Mode
2nd Stage
Multi-
Stage
AC2
GA2
EL2
Cool
Mode
2nd Stage
De-
humidifier

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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
Single
Stage
Heat
Pump
HP1 24 Volt
(Hot)
Cool
24 Volt
(Hot)
Heat
24 Volt
(Common)
Heat And
Cool Mode
1st Stage
(Com-
pressor)
NOTE: Dual
Fuel Option
De-Energizes
Heat Mode
1st Stage
Blower/ Circulator Fan Energized On Call For Cool (And Heat If Configured For Electric Heat)
O
Energized
Constantly
in Cool
Mode
(Factory
Default)
B
Energized
Constantly
In Heat
Mode (Or
Aux Mode)
Heat
Mode
1st Stage
Heat
Pump “L”
Terminal
Connection
Cool
Mode
2nd Stage
Heat
Mode
2nd Stage
Multi-
Stage
Heat
Pump
HP2
Humidifier De-
humidifier
†

2. After installation, configure the thermostat to the
appropriate system type. Press “Menu” on the thermostat
and refer to these menu options as needed:
CONFIGURATION MENU ITEMS REFERENCE
Display
Code Menu item Default Options
Wireless Setup
Connects Thermostat
to Wi-Fi network
— Connect
Fahrenheit or Celsius F F
C
Outdoor Equipment
Configuration
Cooling or heat pumps
AC2 AC1 – Conventional Cooling 1
(Single Stage)
AC2– Conventional Cooling 2
(Two-Stage)
HP1 – Heat Pump 1 (Single Stage)
HP2– Heat Pump 2 (Two-Stage)
AC0– No Cooling
Indoor Equipment
Configuration
For Gas or Electric Heat
EL2 EL1– Electric 1 (Single Stage)
EL2– Electric 2 (Two-Stage)
FAn
GA1 Gas 1 (Single Stage)
GA2 Gas 2 (Two-Stage)
Reversing Valve Position
Selects “O” or “B” Setting
For Heat Pumps Only
O O
B
2
Fn Circulating Fan OFF Off/10% – 100% (5% increments)
H AA Humidification
Add Accessory OFF Off/On
H SP Humidification
Set Point OFF Off/5% – 50% (5% increments)
dH AA Dehumidification
Add Accessory Od Od/Oc Od – Optimal dehumidification
(Overcool to dehumidify)
Oc – Optimal comfort
(Wired dehumidification)
dH SP Dehumidification
Set Point OFF Off/40% – 95% (5% increments)
Wireless Radio
Turns Wi-Fi Radio On/Off ON Off/On

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3. Once the thermostat is installed and properly configured,
test the equipment by following these steps:
• Turn on power to the system.
• Fan Operation
•If your system does not have a “G” terminal
connection, skip to “Heating System” below.
•Press the “Fan” button on the thermostat and select the
“On” position. The blower should begin to operate.
•Press the “Mode” button to turn off the system. Then
press the “Fan” button on the thermostat and select the
“Auto” position. The blower should stop immediately.
• Circulating Fan
•Press the “Menu” button on the thermostat and press
the “Next” button until you reach the “Fn” screen.
•Adjust the % run time from 10%-100% in 5%
increments by using the arrow up or down
buttons (default is OFF), then press “Exit”.
•The % run time is the percentage of time the
fan shall run in a day. This calculation takes into
account the amount of time the heating, cooling and
continuous fan have run during the same day.

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• Heating System
•Press the “Mode” button on the thermostat
and select the “Heat” position.
•Press the up arrow on the thermostat and adjust the
setting to 1° above the current room temperature. The
heating system should begin to operate and the thermostat
will indicate “Heating” of “Heating Auxiliary” on the screen.
•For heat pumps with auxiliary, press the up arrow
on the thermostat and adjust the setting to 3°
above the current room temperature. The auxiliary
heat should begin to operate and the thermostat
will indicate “Heating Auxiliary” on the screen.
•Press the down arrow on the thermostat and adjust the
setting to 1° below the current room temperature. The
heating system should stop operating and “Heating” or
“Heating Auxiliary” will disappear from the screen.

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• Auxiliary System (only for heat pumps with auxiliary)
•Press the “Mode” button on the thermostat and
select the “Aux” position. This bypasses the
heat pump and runs auxiliary-only heat.
•Press the up arrow on the thermostat and adjust the
setting to 1° above the current room temperature. The
auxiliary heating system should begin to operate and the
thermostat will indicate “Heating Auxiliary” on the screen.
•Press the down arrow on the thermostat and adjust
the setting to 1° below the current room temperature.
The auxiliary heating system should stop operating and
“Heating Auxiliary” will disappear from the screen.

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• Cooling System
•Press the “Mode” button on the thermostat
and select the “Cool” position.
•Press the down arrow 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 thermostat will indicate “Cooling” on the screen. Note
that there can be up to a 5 minute delay for this process.
This is indicated by a flashing setpoint temperature.
•Press the up arrow and adjust the setting to 1° above the
current room temperature. The cooling system should stop
operating and “Cooling” will disappear from the screen.
•If you encounter any issues while testing the equipment,
refer to the troubleshooting actions on page 17.

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• Humidification
•Press the “Mode” button on the thermostat
and select the “Heat” position.
•Press the up arrow on the thermostat and adjust the
setting to 1° above the current room temperature.
The heating system should begin to operate and the
thermostat will indicate “Heating” on the screen.
•Press the “Menu” button on the thermostat and press
the “Next” button until you reach the “H SP” screen.
•Turn Humidification On by pressing either the Up or
Down button until the humidity set point is higher than
the current room humidity. Humidity can be adjusted
from 5%-50% in 5% increments, then press “Exit”.
•Check to ensure humidifier is running.
•Press the down arrow on the thermostat and
adjust the setting to 1° below the current room
temperature. The heating and humidification
systems should both stop operating.

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• Dehumidification
•Press the “Mode” button on the thermostat
and select the “Cool” position.
•Press the down arrow 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 thermostat will indicate “Cooling” on the screen. Note
that there can be up to a 5 minute delay for this process.
This is indicated by a flashing setpoint temperature.
•Press the “Menu” button on the thermostat and press
the “Next” button until you reach the “dH SP” screen.
•Turn Dehumidification On by pressing either the Up or
Down button until the humidity setpoint is lower than
the current room humidity. Humidity can be adjusted
from 40% to 95% in 5% increments, then press “Exit”.
•Depending on installed equipment, check that the
system fan speed has slowed, the dehumidifier is
running, or the system cools up to 3° below temperature
set point or until the humidity set point is reached.
•Press the up arrow and adjust the setting to 1° above
the current room temperature. The cooling system and
dehumidifier (if applicable) should both stop operating.

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SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
No Heat/
No Cool/
No Fan
(common
problem)
1. Blown fuse or
tripped circuit
breaker
2. Furnace power
switch to OFF
3. Furnace blower
compartment
door panel loose
4. Loose connection
to thermostat
or system
1. Replace fuse or reset breaker
2. Turn switch to ON
3. Replace door panel in proper
position to engage safety
interlock or door switch
4. Tighten connections
No Heat 1. Thermostat not
set to Heat
2. Loose connection
to thermostat
or system
3. Heating system
requires service
or thermostat
requires
replacement
1. Set thermostat to Heat.
2. Verify thermostat and system
wires are securely attached.
3. Diagnostic: Set Mode to Heat and
raise the setpoint above room
temperature. Within five minutes
the thermostat should make a
soft click sound and “Heating”
should appear on display. This
sound indicates the thermostat
is operating properly. If the
thermostat does not click, try
resetting the thermostat. If
the thermostat does not click
after being reset, contact your
heating and cooling service
person or place of purchase for
a replacement. If the thermostat
clicks, verify the heating system
is operating correctly.
Troubleshooting

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SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
No Cool 1. Thermostat not
set to Cool
2. Loose connection
to thermostat
or system
3. Cooling system
requires service
or thermostat
requires
replacement
1. Set thermostat to Cool.
2. Verify thermostat and system
wires are securely attached.
3. Diagnostic: Set Mode to Cool
and lower setpoint below room
temperature. Same procedures as
diagnostic for “No Heat” condition
except set the thermostat to Cool
and lower the setpoint below the
room temperature. There may be
up to a five minute delay before
the thermostat clicks in Cooling if
the AC Protection feature is on.
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.
Thermostat
Display &
Thermometer
Disagree
Thermostat display
requires adjustment Display can be adjusted +/-5° using the Temperature Offset in Sensi app.

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SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
Humidity
Display &
Hygrometer
Disagree
Humidity display
requires adjustment Display can be adjusted in 5% increments +/-25% using the
Humidity Offset in the Sensi app.
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
1. Heating or Cooling
system is not
able to heat/
cool the space to
within 5 degrees
of the setpoint
within 2 hours
2. If “--” is displayed
for the Room
Temperature,
a replacement
thermostat
is needed
3. None of the
buttons operate
on the thermostat
1. See corrective action for
“No Heat” or “No Cool”
2. Replace thermostat
3. Make sure keypad lockout is
not turned on. If it’s OFF, try
resetting the thermostat.
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 ‘Fn’ fan run
time percentage is OFF.

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Connecting Sensi to Wi-Fi
1. Ask the homeowner to download the free Sensi app onto their
iOS or Android device.
2. Ask the homeowner to follow the prompts to create
an account.
3. Once the homeowner has logged in, ask to use their device to
connect the thermostat to the Wi-Fi.
4. Select “Connect Thermostat to Wi-
Fi” and follow the in-app prompts to
complete the connection steps.
5. Once the thermostat is connected
to Wi-Fi, enter your registered phone
number by selecting “Contractor” from
the drop down menu.
QUICK TIP: You must have your customer’s Wi-Fi Network
(SSID) and Password, along with the Sensi Security Code
card to complete the wireless setup.

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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: 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.
To prevent electrical shock and/
or equipment damage, disconnect
electric power to system at
main circuit breaker box until
installation is complete.
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.
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.
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 location to send
product containing mercury.