Lennox® S40 Smart Thermostat

508223-01 12/2022

Dallas, Texas, USA

Dallas Home

Temp Status My Home

Heat to Cool to

68 75

Feels Like

60%

Away Weather

Lennox

S40 Smart Thermostat

User Guide

Table of Contents

Features............................................... 4

Display Features ......................................... 4

External Component Locations ................ 4

Reboot Button, Micro USB Connection

and Built-in Sensors ................................... 4

Comfort Features ........................................ 4

Optional Accessories ................................. 5

Downloading Lennox Smart

Applications ........................................ 5

Lennox Smart Technician App .................. 5

Lennox Smart Thermostat App ................. 5

Connecting the Thermostat to the

Home Wi-Fi .......................................... 6

Multiple S40 Thermostats in the Home .... 6

Wi-Fi Considerations .................................. 6

Supported Wi-Fi Network Types ................ 6

Connecting to a Visible Home Wi-Fi

Access Point ............................................... 6

Connecting to a Hidden Wi-Fi Access

Point ............................................................. 6

Electromagnetic Interference

Causing Poor Connectivity ........................ 7

Wi-Fi Terminology ....................................... 7

Received Signal Strength Indicator

(RSSI) ........................................................... 7

Creating an Account ......................... 8

Using the Thermostat ................................. 8

Using the Lennox Smart Thermostat

App ............................................................... 8

Home Screen Details .........................11

Temperature Settings ............................... 12

Current Outdoor Temperature and

Weather Forecast ...................................... 12

Time and Date Display ............................. 12

Humidity Display ...................................... 12

Away .......................................................... 12

Temp .......................................................... 12

Status ......................................................... 12

My Home .................................................... 12

Thermostats and Zones ................................ 13

Lennox Smart Room Sensor ........................13

Lennox Smart Air Quality Monitor ...............13

Lennox Wireless Extender (BLE) ................. 13

PureAir S ........................................................13

Home and Status Screens Icon

Descriptions ...................................... 14

Menu .................................................. 18

General ...................................................... 18

Notications ...................................................18

User Account .................................................18

Display Settings.............................................18

Lennox Dealer Support Access ...................19

System ....................................................... 19

Mode ...............................................................19

Schedule (Single Zone) .................................19

Schedules (Zoning) .......................................21

Fan (On, Auto and Circulate) ........................ 21

Settings ............................................. 22

System Info ............................................... 22

Settings .................................................... 22

Wi-Fi ................................................................ 22

Away ...............................................................22

Manual Away .........................................................22

Smart Away ...........................................................23

Current Temperature ..................................... 24

Feels Like .............................................................24

Using Smart Room Sensors .................................. 24

Fan ..................................................................25

Allergen Defender .................................................25

Circulation Timer Adjustment ................................. 25

Heat / Cool ......................................................25

Perfect Temperature .............................................. 25

Wider Set-Point Range ..........................................25

Auxiliary Heat ........................................................25

Safety Protection ...................................................25

Humidity .........................................................25

Humidity Control .................................................... 26

Humidication Control Center .....................26

Dehumidication Control Center ...........................26

No Dehumidication Accessory Installed ..............26

Humidify + Dehumidify Settings ............................26

Dehumidication Accessory Installed ....................28

Smart Zoning System ....................................28

Heating / Cooling Changeover ..............................28

Cooling Operation ................................................28

Heating Operation ................................................28

Notications ...................................................29

Peak Monitoring .............................................29

Enable Peak Monitoring ........................................29

Enroll in Peak Monitoring ......................................29

Peak Monitoring Settings ......................................29

Canceling Peak Monitoring Event .........................30

Cancel Enrollment .................................................30

Devices ........................................................... 30

Thermostat ............................................................30

Smart Devices .......................................................30

Equipment ...................................................... 30

PureAir™ S ...........................................................30

Ventilation .............................................................. 30

Advanced Settings ........................................31

View Support Service Control Center ....................31

Restart .................................................................. 31

Unregister System .........................................31

Lennox Smart Devices ..................... 32

Lennox Smart Room Sensor .................. 32

Adding and Removing Smart Room

Sensor ............................................................32

View and Understanding the Smart Room

Sensor Detail Screen.....................................32

Room Averaging using Occupancy

Detection ........................................................32

Occupancy Sensor Setting ...........................32

Lennox Wireless Extender ....................... 33

Adding and Removing the Lennox

Wireless

Extender .........................................................33

View and Understanding the Wireless

Extender Detail Screen .................................33

Lennox Smart Air Quality Monitor .......... 33

Status Indicator Light Color Descriptions ..33

Adding and Removing the Smart Air

Quality Monitor (SAQM) ................................ 33

How the Smart Air Quality Monitor Works ..34

Side Switch ....................................................34

Denition of Contaminants ...........................34

Smart Air Quality Details Screen .................35

Indoor Level of Air Cleanliness Setting .......35

View Details and Postpone Cleaning Air .....36

Third-Party Integration ..................... 36

Amazon Alexa ........................................... 36

Changing to Celsius ......................................36

Heat and Cool (Auto-Changeover) ...............36

Additional Help ..............................................36

Google Home and Assistant .................... 36

Perfect Temp and Schedule Mode

Functions .......................................................37

Heat / Cool Mode (Auto-Changeover) ..........37

Additional Help ..............................................37

Control4

Smart Home | Operating

System ....................................................... 37

Building36® ............................................... 37

Alert Code Priority Types and

Notication Options ......................... 38

FCC Statements ................................ 39

FCC Compliance Statement —

PART 15.19 ................................................ 39

FCC Interference Statement —

PART 15.105 (B) ........................................ 39

RF Exposure Information ......................... 39

Canada License-Exempt RSS

Standard(s) Operation ...................... 39

Index .................................................. 40

Features

The Lennox

S40 Smart thermostat recognizes and connects to all Lennox

communicating products to automatically congure and control the heating/

cooling system (based on user-specied settings) for the highest level of

comfort, performance and efciency

Display Features

Specications for the display are as followings:

• 7” Display Capacitive touchscreen display

• Screen resolution: 1280 x 800

• Screen ratio: 16:9

• Dots per inch: 72dpi

External Component Locations

Ambient Sensor

Reboot

(Pin Hole)

Micro USB with

Cap Cover

BOTTOM VIEW

FRONT VIEW

BACK VIEW

Humidity

Sensor

Sub-Base

Figure 1. Thermostat External Components

Reboot Button, Micro USB Connection and Built-in Sensors

The following diagrams in this section illustrates the basic Lennox control

wiring for all compatible components.

NOTE: The screen can also be activated by touching it.

• Ambient sensor - This sensor determines ambient light levels around

the thermostat. If screen brightness is set to AUTO, the thermostat will

automatically adjust screen brightness based on surrounding room light. To

set to AUTO, go to Menu > Settings > Display and enable Auto Brightness.

• Humidity sensor - This is the intake location for the built-in humidity sensor.

Do not block the intake location. The indoor humidity percentage is displayed

(enabled by default) on the home screen. The humidity percentage display

on the home screen can be disabled by going to Menu > Setting > Display.

• Temperature sensor - This determines the room temperature.

• Reboot button - Using a paper clip, press and hold this button for

approximately six (6) seconds to reboot the Thermostat. No settings are lost

using this procedure.

• Micro USB connector with cover - For future use.

Comfort Features

• Smart Away

mode brings Lennox innovation to energy savings by doing

what regular programmable thermostats cannot. Rather than simply following

a set schedule, Smart Away lets the Lennox S40 Smart Thermostat adapt

to your life, perfectly. Smart Away works with the GPS in your family’s

smartphones to detect when the house is empty. When it’s sure that nobody

is home, it sets the temperature back to save energy. Then, when the

Lennox S40 Smart Thermostat detects that someone is on the way home,

it returns the system to normal operation so everyone always comes home

to comfortable air.

• FEELS LIKE

brings Lennox innovation to comfort by optimizing and

automating all the factors that affect how air feels. With the Lennox S40

Smart Thermostat, you simply set a single temperature that you want.

The thermostat will then take into account all the factors that affect comfort,

including heating, cooling and humidity, and create your ideal environment.

It’s very similar to the way the “feels like” temperature on a weather report

works.

• Allergen Defender brings Lennox innovation to cleaner air by monitoring the

air quality and pollen levels in your zip code. When high levels of pollutants

or allergens are reported, the Lennox S40 Smart Thermostat automatically

increases fan speed to create more clean air per hour in your home.

• Climate IQ

- Monitors current climate conditions and automatically removes

excess humidity when necessary (requires Lennox communicating outdoor

unit).

• Schedule IQ - With this feature you only need to program the thermostat

once. Whenever there’s a change in your routine, the thermostat adapts

heating and cooling to match.

• Perfect Temperature (Single Set Point) - In non-zoning applications this

allows a single temperature setting to be used to cool or heat the home.

• Supports air conditioning or heat pump units with up to four stages of heat /

two stages of compressor operation (two stages of heat pump heating, two

stages of auxiliary back-up heating and two stages of emergency heating).

• Variable - capacity / multiple - stage Heat • Cool, universal compatibility (gas/

electric/heat pump/air conditioner). When the S40 is used with the variable

speed equipment homeowners can save up to 30% on their energy costs

over single stage equipment and 15% over two stage equipment.

• Dual-fuel capable when using Lennox communicating heat pump unit with

two balance points.

• Humidication measurement and dew point adjustment controls.

• Heat • Cool mode -- Permits control of heating, cooling, humidication, and

dehumidication without user involvement.

• Lennox

Smart Room Sensors for better temperature averaging throughout

your home

Optional Accessories

• Lennox

Wireless Extenders can be used increase the range for your

Lennox

Smart Room Sensors and Lennox

Smart Air Quality Monitor.

• Lennox

Smart Room Sensor. This sensor can be used for temperature

averaging with up to a maximum of six (6) device.

• Lennox

Smart Air Quality Monitor. This device is an air quality monitor that

provides alerts, recommendations, and triggers air purication on demand.

It detects and tracks particulates, carbon dioxide and volatile organic

compounds (TVOCs) inside the home. When poor quality air is detected, it

triggers your system to cycle and clean the air, providing peace of mind that

your family is breathing the most healthy, perfect air.

• PureAir™ and PureAir™S Air Purication Systems - Indoor air quality with

time based notication of consumables including media lters, UVC bulbs,

humidier pads, and PureAir system catalyst service / replacement.

• Lennox

Smart Zoning with supports up to four zones.

• Humiditrol

Enhanced Dehumidication Accessory (EDA).

• ERV/HRV and fresh air dampers are supported when using an Lennox

Equipment Interface Module.

IMPORTANT

Due to Lennox’ ongoing commitment to quality, features and options are

subject to change without notice and without incurring liability.

Improper installation, adjustment, alteration, service or maintenance can

cause property damage or personal injury. Installation and service must be

performed by a qualied installer or servicing agency.

Downloading Lennox Smart Applications

Scan the QR codes listed as follows to download the specic application that

is compatible with your mobile device.

Lennox Smart Technician App

Google Play

(Android

)

App Store

(iOS)

Lennox Smart Thermostat App

Google Play

(Android

)

App Store

(iOS)

Connecting the Thermostat to the Home Wi-Fi

Multiple S40 Thermostats in the Home

If your home will have multiple S40 thermostats then they all MUST be on the

same 2.4GHz Home Wi-Fi network in order to communicate with each other.

Wi-Fi Considerations

• This thermostat cannot connect to a home wireless router that uses more

than 32 characters in the wireless access point name (visible or hidden).

• This thermostat will support up to a 63 character Wi-Fi password. Passwords

cannot contain blank spaces or % symbol.

• If the home Wi-Fi connection is unsecured, then Wi-Fi security MUST be

enabled. Consult your router documentation on how to enable Wi-Fi security

• This thermostat supports the following Wi-Fi security protocols: WEP, WPA,

WPA2 and WPA3.

• Never use a home guest account.

• Always use a secure connection physically located in the home where the

thermostat is located.

• Lennox S40 and S30 Smart Thermostats are not designed to communicate

with each other even when on the same network.

Supported Wi-Fi Network Types

Supported wireless network types are listed as follows:

Table 1. Supported Wi-Fi Standards

Standard Description

802.11b

Compatible.

802.11g

Compatible.

802.11n (Wi-Fi 4)

Compatible.

802.11ac (Wi-Fi 5)

Compatible.

NOTE: MIMO is not supported.

802.11ax (Wi-Fi 6)

Not directly supported. Wi-Fi 6 routers are 100%

backwards compatible with Wi-Fi 5 and older Wi-Fi

devices.

NOTE: MIMO is not supported.

Connecting to a Visible Home Wi-Fi Access Point

1. From the thermostat’s home screen, go to Menu > Settings > Wi-Fi.

2. Slide the option to the ON position to enable Wi-Fi.

3. Select Not Connected to display a list of available access points.

4. Select your home Wi-Fi network.

5. Enter the home Wi-Fi network password and select join to continue.

NOTE: If you wish to see the characters you are typing, check show password.

6. Verify the Thermostat Connectivity Status indicator appears as illustrated

in “Figure 2. Thermostat Connectivity Status”. All connect icons will need to

display green check marks across all connections.

Lennox S40

Smart Thermostat

Router

Internet Service

Provider

Server

Figure 2. Thermostat Connectivity Status

Connecting to a Hidden Wi-Fi Access Point

1. From the thermostat’s home screen, go to Menu > Settings > Wi-Fi.

2. Slide the option to the ON position to enable Wi-Fi.

3. Wi-Fi network indicator will show not connected. Select “not connected”.

4. Scroll down and select other.

5. The “enter new network information” screen will appear. Enter the name

of the hidden network.

6. Select your Wi-Fi access point Security. Options are: none, WEP, WPA,

WPA2 and WPA3.

7. Once a security type is selected, a password eld will appear. Enter your

Wi-Fi password to connect to your home Wi-Fi network.

NOTE: If you wish to see the characters you are typing, check show password.

8. Select join.

9. Verify the Thermostat Connectivity Status indicator appears as illustrated

in “Figure 2. Thermostat Connectivity Status”. All connect icons will need to

display green check marks across all connection

Electromagnetic Interference Causing Poor Connectivity

Locate the thermostat and router away from other devices that could possibility

interfere with wireless communications. Some examples of other devices that

could interfere are:

• Microwave ovens

• Wireless cameras

• Portable phones and bases

• Baby monitors

• Wireless speakers

• Bluetooth devices

• Garage door openers

• Neighbor’s wireless devices

To eliminate a possible source of interference, temporally disable any devices

and see if Wi-Fi performance has improved.

Wi-Fi Terminology

The following terminology is used in this troubleshooting section:

• Received Signal Strength Indication (RSSI). This indicates the signal

strength of the Wi-Fi router being received by the scanning device (i.e., smart

phone). So the higher the RSSI number (or less negative in some devices),

the stronger the signal.

• Internet Protocol Address (IP address). This is an address assigned by your

home router for each network device (e.g., computer, printer, thermostat).

Received Signal Strength Indicator (RSSI)

The RSSI can be viewed from the thermostat.

1. From the home screen, select Menu > Settings > Wi-Fi > and select right

arrow next to the Wi-Fi network name and then select it again.

2. When selecting the right arrow (>) the second time, a screen will appear

which will display an option to forget the network. In addition IP address,

subnet mask, router IP, DNS, MAC Address, Speed, wireless type, BSSID

and RSSI.

Figure 3. Ideal RSSI

NOTE: If the RSSI signal strength is anywhere between -9 to -69, then the

signal strength is sufcient. If outside this range, then either relocate

the router closer to the thermostat, add a repeater, or move the

thermostat. Adjusting antenna on router or extender/repeater may

resolve the issue.

Creating an Account

IMPORTANT

The preferred method to creating a new Lennox thermostat account and

adding the thermostat is by using the Lennox Smart Thermostat App .

You have two methods in creating your account. You can use either the

thermostat or the Lennox Smart Thermostat App.

Using the Thermostat

1. Verify that the thermostat is connected to the home Wi-FI and that

all indicators are green and check marked as illustrated in “Figure 2.

Thermostat Connectivity Status” on page 6. From the home screen, go

to Menu > Settings > Wi-Fi.

2. From your thermostat’s home screen, go to Menu > User Account.

3. Select Create New Account.

4. Enter account details such as your rst and last name, phone, email

address, and password.

5. Select whether you want to receive e-mail updates and reminders.

6. Select allow your dealer to receive notications (highly recommended).

IMPORTANT

Please verify that your dealer has already added their account and contact

information when they installed your thermostat. That information can be

found at Menu > Lennox Dealer Support Access > Local Lennox Dealer

Info. If this information is missing, please contact your local Lennox dealer

and get the information you need to complete your dealer contact information.

7. Select agree to EULA.

8. Enter your information and select Next. Enter your country/region, address,

city, state, and zip code.

9. Select Create Account.

10. It is important that you provide your Lennox Home Comfort System

Dealership remote sharing and Advanced Diagnostics and

Troubleshooting (On / Always) options.

Using the Lennox Smart Thermostat App

NOTE: The following example was using and Android 11 mobile device.

Starting with Android 12 there are new screens addressing precise

location. Always enable precise location when using the Smart Away

feature. All iOS mobile devices as well will require precise location be

enabled for the Smart Away feature to function correctly.

1. Download the Lennox Smart Thermostat App from either the Apple App

Store or on Google Play to your mobile device.

2. Verify that the thermostat is connected to the home Wi-Fi and that

all indicators are green and check marked as illustrated in “Figure 2.

Thermostat Connectivity Status” on page 6.

3. Launch the Lennox Smart Thermostat app.

4. Select Allow. This is required if you intend to upload a photo as a

screensaver on the thermostat.

5. On this screen select the Sign up option to create an account.

6. The next pop-up is asking to Allow Thermostat to access this device’s

location. This is required if you intend to use the Smart Away feature to

control your thermostat. Select While using the app.

7. If you plan to use the Smart Away feature, this select Settings > Location

permissions. Select Allow all the time. Select the left arrow next to

Location Permission to return to the previous screen.

8. Complete all elds on the Sign Up screen. Also enable Email Updates

and select the box that you agree to the Lennox EULA.

9. Select the Sign Up button at the bottom of the screen. A pop-up screen

will indicate that your account was successfully created. Select OK to

continue.

10. Now you will need to add your thermostat to your user account. First go

your thermostat and from the home screen go to menu > user account and

then near the bottom of the screen, select Generate pin. A ve digit pin

number will appear.

11. Return to your mobile device and select the Plus sign on the screen. Then

enter the 5 digit number displayed on the thermostat here. Then select

Add.

12. The next screen will provide the option to Add New Home. Select that

option.

13. Enter the home information required on this screen.

14. It is highly recommend by Lennox to check the option to allow dealers

to receive service alerts and if possible remotely x any issue that may

occur with your thermostat. See “Home Screen Details” on page 11

for understanding why it is important to allow your Local Lennox Dealer

access.

15. Select Done.

16. A screen will appear asking that you verify your home address. If everything

is correct, select Done.

Home Screen Details

Time and

Date

Manual setting

to put system in

pre-define set points

Manual adjustment

for Heating

Manual adjustment

for Cooling

Accuweather

(based on user’s

account zip code)

Indoor

Humidity

Actual Room

Temperature

Marker

Heating Adjustment

Tool

Cooling Adjustment

Tool

System Name or

Zone Name

Current Room

Temperature

Animated icons will appear here

for active call for cooling, heating,

ventilation and various fan functions

This location could display Feels Like,

Inside or Average when

temperature averaging only is

active. What is displayed depends on

the system setup.

Selecting this

will return you to

the thermostat

or last viewed

zone homescreen

Selecting Status will display humdity level, various fan operations, schedules

being used, ventilation and other various system operations.

Selecting this will show detail information and operational status of the

thermostat, all zones (if applicable), Lennox Smart Room Sensor, Lennox

Wireless Extender, Lennox Smart Air Quality Monitor and PureAir S devices.

Indicates termperature

averaging is active

Cleaning Air

Various system operation status icons

will appear here and simultaneously under

the Status selection at the top center of

the screen.

Figure 4. Thermostat Home Screen

Temperature Settings

Large display of current

inside temperature (°F or °C)

Selecting the heat or cool set point

indicators on the round temperature band,

or selecting the Heat-To or Cool-To buttons

displays the heat or cool menu screens

Both heating and cooling set point

indicators on the round temperature band

and the Heat-To and Cool-To buttons are

displayed if the system is set to Heat/Cool

mode or if an active schedule is set to Heat/

Cool mode.

Heating and Cooling Set

point Indicators on the round

temperature band

Current cooling set point

temperature Button (Cool-To)

Current heating set point

temperature Button (Heat-To)

Current Outdoor Temperature and Weather Forecast

Displays current outdoor

temperature in °F or °C

and the current weather

forecast

The default outdoor temperature is supplied

by the outdoor air temperature sensor or

the Wi-Fi data connection (homeowner

selectable on the thermostat). The outdoor

sensor is furnished as standard with Lennox®

Communicating outdoor units, optional for

conventional units.

Time and Date Display

Displays current date and time

NOTE: Date and time are automatically set based on the address zip code if the

thermostat is connected to the Internet and user account completed.

Manual adjustment can be made if the thermostat is not connected.

Humidity Display

Displays the current inside relative humidity below current indoor temperature.

Away

The user can manually put the system into away mode by pressing the Away

icon located on the bottom left-hand side of the home screen. When the system

is in Away a status notication (Away is Active) is displayed on the right-hand

side of the home screen.

In order to exit Away, select Cancel located on the bottom left-hand side of the

home screen. Selecting the Away is Active status notication will display the

current set point range for high and low temperature settings. There is also the

option to select Cancel here as well by selecting Yes.

While in Away, the Away Set points are used to control the high and low

temperature setting for the thermostat and all zones simultaneously if Smart

Zoning is installed. The Away Set points can be changed from the default

values by going to Menu > Settings > Away.

Temp

Returns to the thermostat home screen or the home screen for a specic zone

if Smart Zoning is installed. Displays current temperature screen for the current

system where the thermostat and sensors are located.

Select the Temp button from the Status or My Home screen to return to the

thermostat home screen or last zone viewed.

Status

Displays current system operating status for the current system/area where

the thermostat and sensors are located. Details such as humidity levels, Feels

Like being active, any of the various fan modes and various other system

background activities.

My Home

Lennox Smart Home devices and equipment such as multiple S40 Thermostats

on the same home network, Smart Room Sensors, Wireless Extenders, Air

Quality Monitor, PureAir S and Zoning Control are all optionally purchased

items and will appear on this screen if installed.

Figure 5. My Home Screen

This screen will display multiple thermostats in the home. It will also display

others devices such as Lennox Smart Zoning (up to four zones per thermostat),

Lennox Smart Sensor, Lennox Smart Air Quality Monitor and PureAir S.

• Selecting any item on this screen will display the detail screen for that device.

• A yellow or red dot with an explanation point indicates there is an alert

condition for that specic device.

Thermostats and Zones

Selecting the icon will bring up either the thermostat home screen or in a zoning

system the home screen for the specic zone selected if zoning is installed.

For further details concerning zoning control, see “Smart Zoning System” on

page 28.

Lennox Smart Room Sensor

IMPORTANT

The Lennox Smart Room Sensor is currently not compatible with systems

using the Lennox Smart Zoning System (iHarmony) installed.

NOTE: The Lennox Smart Room Sensor is an optional accessory sold

separately.

Selecting this options will display the details for the sensor selected. What is

displayed is the current temperature for the room that the sensor is located in.

Additional details include:

• If sensor is participating in temperature averaging.

• Humidity level in the room

• If the room is occupied or unoccupied.

• Battery percentage

• Wi-Fi connection strength.

See “Lennox Smart Devices” on page 32 for further details.

Lennox Smart Air Quality Monitor

NOTE: The Lennox Smart Air Quality Monitor is an optional product sold

separately.

Selecting this option will display the Current Air Quality. Color indicators are

Green indicates good, Yellow indicates fair and Red indicates poor.

In addition a bluetooth signal strength indicator is provided to show the signal

status.

There are also three options that can be selected. Those options are Monitor

Settings, Air Pollutants and More Information.

When selecting Monitor Settings the following options are available:

• Air Quality Monitor Name allows the user to rename the sensor using the

virtual key board.

• Device Type will always show Monitor.

• About Air Quality Monitor will list model and serial numbers along with

rmware version.

• Level of Indoor Air Cleanliness. Options are High, Medium and Basic

(Most Economical)

Information concerning Air Pollutants and More Information can be found

further in this guide (see “Lennox Smart Air Quality Monitor” on page 33).

Lennox Wireless Extender (BLE)

NOTE: The Lennox Wireless Extender is an optional product sold separately.

Selecting this icon will bring up the wireless strength indicator. There is an

additional selection called Extender Settings. This screen includes:

• Extender Name: This will show the current name of the extender and can

also be renamed from this screen.

• Device Type: Extender

• About Extender: This will list the model, serial number and rmware version.

For further details, see “Lennox Wireless Extender” on page 33.

PureAir S

NOTE: The Lennox PureAir S is an optional product sold separately.

Selecting this option will display the PureAir S lter life. Red indicates 1-10%

lter life left, yellow indicates 11-30% lter life left and green indicates 31-100

lter life left. Also available are:

• More Info: Information is listed here on the PureAir S product.

• Reminders: You can set service reminders here for 1 day, 1 week, 1 month,

3 months or custom.

• Service Contracts: This will list your service contact if it has been entered

into the thermostat.

Home and Status Screens Icon Descriptions

Table 2. Home and Status Screens Icon Descriptions

Icon

Function or

Screen Text

Purpose

Menu Selecting this icon will bring up user and installer menus.

Menu with

Notication

Icon

If there are one or more notications this icon will appear over the menu icon. The number in the center indicates how many

active notication are present.

Feels Like is Active or Turning Feels Like on

Smart Away is

Active or Away

is Active

When the away icon is Selected, the system will automatically use energy saving settings - heat-to 62 (16.5) and cool-to

85 (29.5). Temperatures can be adjusted by pressing on the available temperature setting (i.e., heat-to or cool-to). To exit

away, press the cancel icon. In a zoning system, all zones are set to a single heat-to and cool-too setting. Note that when

manually selecting Away from the home screen, the Smart Away feature (if enabled under settings) will be temporally

disabled until Away is canceled.

Heating System is heating the home. This animated icon will appear above the system name on the home screen.

Cooling System is cooling the home. This animated icon will appear above the system name on the home screen.

Humidifying

If humidication equipment is installed and congured, the system will display this message when adding humidity to the

air in the home.

Dehumidifying

The system can be used in cooling mode to help remove excessive humidity as determined by the user setting. Go to Menu

> Settings > Humidity > and turn on dehumidify. Then adjust the acceptable low and high humidity levels in the home

with the dehumidication set-point slider.

Table 2. Home and Status Screens Icon Descriptions

Icon

Function or

Screen Text

Purpose

Defrosting The heat pump system is defrosting the outdoor unit coil (only when required).

Emergency

Heat

All heat pumps operating in northern climates below 35°F (1.6°C) normally need a supplemental heating source. Usually it

is in the form of electric heating provided by the indoor unit. Other sources could be gas, oil, or hot-water back-up systems

as well. The supplemental heat is also referred to as “second-stage” or “back-up” heating, with “rst-stage” being the heat

pump only. Emergency heat is when you use your supplemental heat (2nd stage) by itself, without the use of your heat

pump (1st stage heat). Not available for non-heat pump systems.

Auxiliary Heat

Is only available with heat pump system. If outdoor temperature is above the high balance point, only the heat pump will

operate - default 50°F (10°C) high. If outdoor temperature is below the low balance point, only auxiliary heating will operate

- default 25°F (-4.0°C) low. If outdoor temperature is in-between the high and low balance point, both the heat pump and

auxiliary heat sources can operate.

Will start soon

A ve minute safety delay prevents the compressor from operating too soon after shut-down to allow internal pressures to

equalize.

Ambient

lockout

This indicates that either the outdoor temperature is above or below the balance point temperature settings. The low

balance point setting prevents heat pump heating below the set point and back up heat will be used. Typically the default is

25°F (-4.0°C), but that setting can be adjusted by your dealer. At 25°F (-4.0°C) or below for example, only auxiliary heating

(electric or gas) is used. If the high balance point is set to 50°F (10°C) for example, which is also adjustable by your dealer,

then auxiliary heat will not be allowed. Only heat pump heating will be used. Anytime the outdoor temperature is below or

above the balance point temperature settings, the ambient lockout notice will appear on the home screen.

Fan is running Fan set to ON. Fan is NOT following the schedule and runs continuously until it is changed from the selected mode.

Fan in auto

mode is active.

Fan set to Auto. Fan will follow the fan setting in the selected schedule.

Fan in circulate

mode is active.

Fan set to Circulate. Fan is following schedule and cycles during periods of equipment inactivity. Circulate run time is

dependent on user settings.

Table 2. Home and Status Screens Icon Descriptions

Icon

Function or

Screen Text

Purpose

Fan in Allergen

Defender mode

is active

Allergen Defender: Go to Menu > Settings > Fan to turn on or off Allergen Defender. Internet weather must be enabled

and the pollen count is high for the following pollens (Grass, Ragweed, Mold, Tree and Overall Pollen) the fan will run

between heating or cooling demands to help clean the air. Works best with MERV 11 or higher lter.

Allergen Defender only runs when no other fan modes (On, Auto or Circulate) are being utilized.

System Under

Test

Typically occurs when the system has had a power interruption. The thermostat starts to look for the indoor and outdoor

controls. Sometimes the outdoor control takes longer to boot up and therefore does not respond to inquiry by the thermostat.

Recycle power to system may resolve issue.

Aux Heat Auxiliary heating is active.

Load shedding,

wait time 45 min

Action to reduce the load on something, especially the interruption of an electricity supply to avoid excessive load on the

generating plant.

Service Urgent

Service Urgent means that a service call is needed to get the system running.

Selecting the icon will display a pop-up screen. Service Urgent. The system has encountered a problem. Alarm ID: xxxx

and a description of the alarm is provided. Select OK to cancel the pop-up screen.

Coasting to

Perfect Temp

Coasting allows the current temperature to reach the desired single set-point without the system doing any work. The red

arrow indicates the temperature is less than the desired set point. The blue arrow indicates is greater than the desired set

point.

Coasting to

Perfect Temp

Ventilating or

Ventilating unit

(specic Time)

This indicates the system is actively ventilating and the precise time the cycle will end. Selecting cancel will terminate the

current ventilation session.

Selecting the icon will display a pop-up screen. Ventilating until x:xx pm. Do you wish to cancel. Options are No or Yes.

Table 2. Home and Status Screens Icon Descriptions

Icon

Function or

Screen Text

Purpose

Peak Monitoring

until x:xx pm -

x:xx pm

The utility company will automatically set the energy savings time period. You can select cancel to exit this mode.

By canceling you will be opting the system out of the current active energy savings events. A pop-up screen will ask you to

verify this is what you wish to do.

Selecting the icon will display a pop-up screen. Peak Monitoring will be active from x:xx pm to x:xx pm.

Transitioning to

next schedule

The system is following an active schedule and is transitioning to the next temperature setting based on a time indicator.

Schedule

hold until next

period

Selecting the icon will display a pop-up screen. Schedule will hold until next schedule setting. There is also the option

to select duration of hold or cancel. Options to select are Cancel, Duration and Hold.

Schedule Hold

until xxxx

Two pop-up may appear.

Schedule will hold. Do you wish to cancel? Options are Yes or No.

Schedule will hold until xxxx. Do you wish to cancel? Options are Yes or No.

Cleaning Air

When the Lennox Smart Air Quality Monitor has determined that there is poor air quality in the home it will run the indoor

unit fan or any other indoor air quality devices installed to clean the air. Selecting this notication on the thermostat home

screen will allow you to view details concerning the air quality or postpone the air cleaning for a specied time period.

From the thermostat home screen select Cleaning Air and then you have the option to view details and postpone. Selecting

postpone will display a screen where you can select 1, 2, 4, 8 and 24 hours.

Postponing

Cleaning Air

Select the Menu button on the home screen to display the Menu screen.

If multiple thermostat control systems are available they will be shown below

the General menu settings.

General

Notications

Filters for displaying notications are All Notications (options that can be

checked off are All Notication, Service Urgent and Maintenance) The

second lter option is All Time Periods and the selection options are All Time

Periods, Last 24 hours, Last 30 days and Last 12 months.

User Account

This section is only accessible if the thermostat has an active connection to

Wi-Fi. On this screen you have the option to sign into an existing account or

create a new account.

Also available is the Generate Pin option if you are setting up your account

using the Lennox Smart Thermostat App.

Once the account has been created and thermostat added to that account,

then information under this section can be edited at any time.

Selecting User Account will take you to the User Settings screen. There you

can select your Email (>) to view and edit information such as correct First and

Last Name, Change Phone Number, Email and Password, View EULA and

toggle on Email Updates and Monthly Report Email (System Performance

Information).

There is also a option to Move Out at the bottom of the User Settings screen.

Selecting this option will remove the thermostat from your Lennox account.

This would be done typically if your were selling your home or replacing the

thermostat.

Display Settings

The available settings are:

• Auto Brightness with an option for either ON or OFF. When set to OFF,

there is an adjustment bar to set the brightness level.

• Screen Lock with an option Unlocked, Partially Locked and Locked.

Press and hold the lock icon for 3 seconds

to unlock (Partially Locked and Locked)

Figure 6. Unlocking

NOTE: Lock screen can also be used to clean the thermostat screen.

• Proximity Sensor which is ON by default. When set to ON, the display will

automatically turn on when you approach it. When set to OFF, you will have

to touch the screen for it to turn on.

• Screen Saver which by default is set to OFF. Options are OFF, Weather,

Power Save (blank screen) and photo. Photo can be upload to the thermostat

by using the Lennox S40 Smart Thermostat app.

» Use the Lennox Thermostat App, select Menu > Display Settings

> Screensaver and upload an image from this screen. If the upload is

successful a conrmation screen will indicate so.

» From the thermostat home screen, select Menu > Display Settings >

and turn on Screensaver and then select Photo. The photo you just

uploaded from the Lennox Smart Thermostat App should appear

and ask you to accept or reject. Select accept to use the picture as a

screensaver.

• Home screen settings are:

» Outdoor Temperature by Source. Options are Accuweather or

outdoor temperature sensor. Default setting is Accuweather. To display

Accuweather you have to have an good Wi-Fi connection, connected to

the Lennox server and logged into your user account.

» Outdoor Weather. This options allows the user to turn on or off outdoor

weather on the home screen.

» Indoor Humidity. This options allows the user to turn on or off indoor

humidity being displayed on the home screen.

Lennox Dealer Support Access

IMPORTANT

You have made an investment in your heating and cooling system and you

expect peak performance. With a simple, ON / Always option, this new smart

thermostat forever changes HVAC equipment diagnostics, maintenance, and

repair. It provides basic maintenance notications and alerts, performance

reports, and the ability for dealers to remotely diagnose and troubleshoot.

This proactive and responsive HVAC care is valid for the lifetime of the HVAC

system. Promising peace of mind by doing away with unnecessary dealer

visits, avoiding potential repair costs, and ensuring nothing short of perfect

air. In some instances, the dealer may be able to correct a problem without

ever having to come to your home, saving you time and money.

Local Lennox Dealer Info: Here you have the options to either just display

information already populated on this screen or add or correct the service

contact information. This is where you can add details such as Name, Country,

Address, phone, email and website information.

Dealer Support Access:

• Remote Sharing - Allow service provider to remotely view the status of your

system. By default this option is set to OFF.

• Advanced Diagnostics and Troubleshooting

» Off - You will not be give authorization to service provider to troubleshoot

your system remotely.

» On / Always -You will always give authorization to service provider to

troubleshoot your system remotely.

Alerts and Notications:

Allows service provider to be notied when your systems needs maintenance.

By default this is set to OFF.

System

Mode

This screen will allow the user to set the operating mode of the system. Options

are Emerg Heat, Heat Only, Heat / Cool, Cool Only and Off

Schedule (Single Zone)

All schedule proles shown in Figure 7 can be can be customized including

schedule name, starting time for each period and related heating and cooling

temperature settings for each period.

Figure 7. Schedule Options Screen

Schedule Proles

• No Schedule - System is not following a schedule. All changes are performed

manually.

• Schedule IQ - This schedule operating in heat / cool mode and answering a

few simple questions will allow the system to know how to set the temperature

for the home based on time settings. By default there are two times and

temperature settings which can be adjusted using the edit schedules option.

Figure 8. Schedule IQ Setup Screen

» At home day wake-up default time is 7:00am and low temperature

setting of 67°F and high temperature setting of 80°F. Start time can be

adjusted by press on the current time setting and can be adjusted as

exampled in gure 6

» At home night sleep default time is 11:00PM and low temperature

setting of 66°F and high temperature setting of 84°F.

» Away - When away from home, Smart Away when enabled (see

“Away” on page 12) is used to set the temperature while the home

is unoccupied. Default low temperature setting of 62°F and high

temperature setting of 85°F. Temperatures for any of the options above

can be adjusted by sliding the low and high temperature circle left or

right on the sliding scale.

Figure 9. Schedule IQ Setup Screen

• Summer – Provides the average Summer indoor cooling set points for home

temperatures. Temperatures and time periods can be adjusted to provide

your desired set points.

• Spring/Fall - Provides the average Spring/Fall indoor cooling set points

for home temperatures. Temperatures and time periods can be adjusted to

provide your desired set points.

• Winter – Provides the average Winter indoor heating set points for home

temperatures. Temperatures and time periods can be adjusted to provide

your desired set points.

• Save Energy – Provides the recommended Energy Star set points

recommended by the Environmental Protection Agency energy savings.

NOTE: All of the above schedule proles can be customized to meet your

particular needs. .

Schedule Options

On each schedule screen except for Schedule IQ, there is an option located

in the top right-hand corner of the screen that will allow you to customized your

experience even further.

Figure 10. Schedule Screen Options

On the schedule options screen, you can rename the schedule prole, assign

day grouping, system mode, fan mode, fan duration and restore to default.

Figure 11. Schedule Options Screen

Schedules (Zoning)

For a zoning system, any prole that is assigned to a specic zone will be

affected by any customization you make to that specic schedule prole.

IMPORTANT

If you need a unique schedule prole for a specic zone, it is recommended

to rename Summer, Spring/Fall, Winter and Save Energy to each specic

zone. Doing so will allow you to have a unique schedule for a specic zone.

The following illustration is an example how the to rename the schedule proles

to match a specic zone in order to have a unique schedule just for a specic

zone.

NOTE: Prole labeled No Schedule cannot be renamed or edited. Prole

Schedule IQ renaming is not allowed.

Bedroom

No Schedule

Kitchen

Tea Room

Schedule

Edit

Schedule

Back

Bedroom

Tea Room Living Room BedroomKitchen

Living

Room

Figure 12. Unique Schedule Prole for Each Zone

Fan (On, Auto and Circulate)

Options are:

• On which means the system will run the fan continuously.

• Auto which indicates it will run during a call for heating or cooling only.

• Circulate will run predetermined number of minutes to an hour. The setting

for this duration per hour can be found at Menu > Settings > Fan. Options

are 9 to 27 minutes per hour.

Settings

The system setting screen will allow the homeowner to connect to their home

Wi-Fi router and give their system a name.

Devices

Settings Equipment

Advanced Settings

Wi-Fi

Away

Current Temperature

Fan

Heat/Cool

Humidity

Smart Zoning System

Notifications

Peak Monitoring

Thermostat

Smart Room Sensor

Smart Air Quality Monitor

Wireless Extender

Add Device

Ventilation

Advanced Settings

Unregister System

System Info System

PureAir S

Figure 13. User Setting Menu

System Info

Selecting this menu item will allow you to rename your system.

Settings

Wi-Fi

See “Figure 2. Thermostat Connectivity Status” on page 6 for information

on how to connect to your home Wi-Fi network.

Away

NOTE: Most of the procedures listed in this section can be accomplished at

the thermostat or using the Lennox S40 Thermostat App or consumer

web portal.

Manual Away

The user can manually put the system into away mode by pressing the “away”

icon. When the system is in away mode, the horseshoe is grayed-out and

shows the “away” status text. In order to exit away mode, the user can press

the “cancel” icon. In away mode, the away set points are used to control the

system. The user can modify the away set points from the default values in

Menu > Settings > Away.

Away

Smart Away

Use the Lennox Smart Thermostat app to control the temperatures in your home while you are away

Reset Smart Away

Please make sure to install the S40 Thermostat App to participate in Smart Away. You can also conﬁgure

the Away fence in the Thermostat App.

Min

Use the Lennox Smart Thermostat App to control the temperatures in yourhome while you are away.

There are currently 2 mobile devices participating.

55°

85°

55°

Max

√

Smart Away is turned on for your system to run smart schedule.

Reset Smart Away

Away Set-points

Figure 14. Away Settings

Smart Away

Both Home Info and Account options must be completed before this feature

can be enabled.

The Smart Away feature depends on:

• Lennox S40 Thermostat App continuously running on your mobile device

(smart phone or tablet) and being logged in to your account.

• Requires Wi-Fi and location settings to be enabled on your mobile device.

Android devices must also have the location mode set to “high accuracy.”

Consult your mobile device user guide for instructions.

Smart Away can also be enabled from your mobile device once you have

installed the Lennox S40 Thermostat App and logged in. Go to the Menu >

Settings > Away and turn ON Smart Away. To allow the mobile device you

are on to use this feature, turn ON participate. The away fence option will

appear and by default, the setting is two miles (3 km). The range for this setting

is 2 to 6 miles (3.00 to 9.50 km).

Inner and Outer Away Fences

The inner away fence is set by the user anywhere between 2 to 6 miles (3.00 to

9.50 km) on the mobile app. This setting can be different for each participating

mobile device. When any of the participating mobile devices are located inside

of its inner away fence, the system will not be in Smart Away; the system will

use the temperature set points dened by the schedule or what was manually

set. Once the inner away fence is set, the outer fence for each participating

mobile device will be automatically calculated by the Smart Away algorithm.

Transition Set Points

When the closest participating mobile device is between the inner and outer

away fences, the thermostat will show the Smart Away indicator. The system

will use transition set points to heat or cool the home. The transition temperature

set points are automatically calculated by the Smart Away algorithm using a

combination of the home and away set points.

Away Set Points

Once all participating mobile devices have moved outside the transition range,

the thermostat will continue to show the Smart Away indicator, and the user-set

away set points will be used to control the system.

Example:

• Away set points are 65ºF (18.5ºC) for heating and 85ºF (29.5ºC) for cooling.

• When the away fence is set to two miles for all participating mobile devices,

and the closest participating mobile device is within the 0-2 mile (0 to 3.22

km) range of the home, the system is considered home.

• The system will use the set points from the schedule or what was manually

set.

• If the closest participating mobile device moves into the 2.1 to 8 miles (3.40

to 13.04 km) range, the system is considered in transition, and the system

will start to either increase or reduce the heating or cooling set point.

• Once all participating mobile devices have moved beyond the 8.1 mile (9.50

km) range from the house, the system sets the set points to the away set

points (65ºF for heating and 85ºF for cooling).

Multiple Mobile Devices

It is possible to have more than one mobile device participating in Smart Away

for this system. The away fence can be set to the same value or different

values for each mobile device. The thermostat will not show the Smart Away

indicator until all devices have moved past their inner away fence, and the

system will not reach the user-set away set points until all devices have moved

past their outer fence.

NOTE: Smart Away will be canceled when the system is enrolled in energy

savings with a utility provider and a energy saving event is active.

Mobile Device Location Services

To use Smart Away you need to be running IOS 12, 13, 14 or 15 for Location

Services Settings.

1. Location services will need to be enabled for this feature to work. Go to

Settings > Privacy > Location Services.

2. Select Always Allow for Smart Away to control the temperature in your

home while you are away

3. Select Always Allow with Precise Location Enabled for Smart Away to

control the temperature in your home while you are away.

4. Select Allow While Using App for Smart Away to control the temperature

in your home while you are away.

To use Smart Away on your Android device, you will need to be running

Android Version 9 or higher. Location Services Settings are as follows:

1. Starting with Android versions 9 and 10, when allowing the Lennox

Thermostat app access to device location you must select Allow all

the time for the Smart Away feature to work correctly so go to Settings

> Apps > Thermostat > Permissions > Locations and Allow all the

time setting is enabled.

2. Starting with Android version 11, to ensure location services for the

Lennox Smart Thermostat’s Smart Away feature are not auto disabled

by Android operating system, go to:

• Settings > Apps and Notications > Select All Apps >

Thermostat > Permissions and locate Remove permission if app

isn’t used and ensure this setting is disabled.

• Settings > Locations > Apps access to location > Thermostat

and select Allow all the time.

3. Starting with Android

version 12, when you

run the setup for the

Lennox Thermostat App,

you will be ask to enable

permissions for precise

location. Select the two

options illustrated here.

Select Precise

Select this option

Current Temperature

Feels Like

This feature is not a temperature setting but the temperature that the space

feels like based on current outdoor and indoor temperatures and indoor

humidity.

When Feels Like is set to On, the words Feels Like will appear above the

indoor temperature display on the home screen.

Current Temperature

Feels Like

indoor

humidity

indoor

temperature

outdoor

temperature

feels like

Feels like temperatures factor in the outdoor temperature and the

indoor humidity for more accurate control of the Temperatures in

your home.

= 75°

√

Figure 15. Feels Like Screen

Using Smart Room Sensors

When Lennox Smart Room Sensors are installed in the home the homeowner

has the option to include individual smart room sensors for determining a better

Feels Like control of the entire home. Using the temperature detected at each

sensor will be factored into the Feels Like result when enabled.

Current Temperature

Feels Like

indoor

humidity

indoor

temperature

outdoor

temperature

feels like

Feels Like termperatures factor in the outdoor temperature and indoor humidity for more accurate control

of the temperatures in your home

= 75°

√

Feels Like

√

Kitchen

Master Bedroom

Off

Participating Smart Room Sensors in Temperature Averaging Based on Occupancy

Figure 16. Feels Like Screen with Smart Room Sensors Selected

Fan

Allergen Defender

Go to Menu > Settings > Fan to turn on or off Allergen Defender. Internet

weather must be enabled and the pollen count is high for the following pollens

(Grass, Ragweed, Mold, Tree and Overall Pollen) the fan will run between

heating or cooling demands to help clean the air. Works best with MERV 11 or

higher lter.

Circulation Timer Adjustment

Circulate air can be adjusted on this screen. Adjustments between 9 to 27

minute duration per hour. The circulate option runs during any mode selected

except when the system is turned off.

Heat / Cool

This screen allows changes to how the system operates. Options are single

set-point, heat pump mode (normal or comfort), auxiliary heat and safety

protection.

Perfect Temperature

1. This option will only be available in non-zoning systems. This option allows

the user to control both heating and cooling temperatures with one single

temperature setting. Factory default is off (see the following gure for

screen example).

NOTE: When set to Perfect Temp, the Heat • Cool position indicator changes.

The blue color (cooling) indicator is on the left and heating (red)

indicator is on the right. This is just the opposite on how it is displayed

in normal Heat • Cool mode. Also the Heat • Cool mode indicator will

display Auto instead.

NOTE: Perfect Temp is not compatible with Google Assistant. Google Assistant

will not be able to adjust your home temperature.

2. Select Heat Pump Mode: (only available with system using a heat pump).

Options are normal and comfort. Default is normal. Descriptions for what

each setting does is displayed on the screen.

Wider Set-Point Range

Changes the default low and high maximum temperature setting from 60-90°F

to 40-99°F (15.5 - 32.0°C to 4.5 - 37.0°C).

Auxiliary Heat

When the outdoor temperature is above the high balance point, only the

heat pump is allowed to run. When outdoor temperatures are below the low

balance point, only the auxiliary heat source is allowed to run. When outdoor

temperatures are between the high and low balance points, then both the heat

pump and auxiliary heat source are allowed to run.

Auxiliary heat is the use of an additional heat source, when the heat pump

BTU capacity is not sufcient to keep up with the home’s heating demand;

sometimes it is also called supplemental heat. When used in a dual-fuel mode,

auxiliary heating is accomplished with a gas or oil red unit. In this mode of

operation, the heat pump must shut down and uses just the auxiliary heating

unit for heating.

If the system is an air handler with electric heat, the auxiliary heat will be in

conjunction with the heat pump when the home heating requires it. Another

use of auxiliary heat with heat pump systems includes a setting called balance

point. Balance point puts temperature limits on when the heat pump and

electric heat work together or independently.

• When the outdoor temperature is above the default high balance point of

50°F (10°C) (default), only the heat pump will be allowed to run (no auxiliary

heat).

• When the outdoor temperature is below the default low balance point of 25°F

(-4.0°C) (default), only the auxiliary heat is allowed to run (no mechanical

heat pump operation).

• When the outdoor temperature is between the low and high balance point

settings both heat sources are allowed to satisfy the heating demand.

Safety Protection

Alerts you if the home gets too cold or hot. This is set under this menu option on

the setting for both low and high temperatures. The system will automatically

turn on either cooling or heating if the home’s interior temperature reaches

either the low or high setting. A notication is also sent to the Home screen

notication area and Lennox S40 Thermostat App.

Humidity

Some options that are available under this section are dependent on type of

equipment (indoor and outdoor units) and humidication accessory is installed.

Adjustment Slider Tools

• Dehumidication Set Point Percentage — The slide bar adjustment tool

allows desired humidity level in the home. Selection between 40% to 60%

are available. Default is 55% when dehumidify is enabled.

• Humidication Set Point Percentage- This adjustment tool is only visible

when dew point is set to OFF. Range is 15% to 45% humidity. Default is 40%.

• Overcooling — This adjustment allows selection between 0°F to 4°F (0°C

to -2°C). This adjustment is only available when Max or Climate IQ (Auto)

is selected. This selection will limit how much overcooling is allowed when

trying to achieve the dehumidication set point. Default is 2°F (1.0°C).

• Dew Point — This adjustment twill help reduce the amount condensation

that may build up on windows and other glass surfaces. A dew point slider

bar option will appear under the humidity menu. By default the dew point

slider is set to OFF. When dew point is set to ON, the slide bar adjustment

will appear with a range of -15% to 15%. Default is 0%.

NOTE: Dew Point - Adjustment requires an outdoor temperature sensor and

is automatically controlled by the outside temperature.

Humidity Control

The following options are available under humidity control:

• Off

• Humidify option is only available when a humidication accessory is

installed.

• Dehumidify option is only available with or without a dehumidication

accessory installed.

• Humidify + dehumidify option is only available when a humidication

accessory is installed.

Humidication Control Center

When a humidication accessory is installed and humidify is enabled, the

options are as follows:

• Normal — Recommended for moderate climates. This runs the humidier

when there is a call for heat and humidication.

• Max — Recommended for drier climates. This runs the humidier when

there is a call for humidication only.

» Dew Point percentage slider adjustment tool is available for both Normal

and Max settings.

» Humidication set point percentage slider adjustment tool is only visible

when Dew point is set to OFF.

Dehumidication Control Center

IMPORTANT

The following dehumidication settings are not applicable and ignored on

systems employing iHarmony Zoning.

No Dehumidication Accessory Installed

When dehumidify is enabled and no dehumidier accessory is installed, the

dehumidication options are as follows:

• Basic — Recommended for moderate climates. No dehumidication is

active. Dehumidication set point slider adjustment tool only is available.

• Max — Recommended when outdoor air is excessively humid. May over

cool your home to achieve the desired dehumidication set point.

• Climate IQ (Auto) — Automatically adjusts system run-time based on a

combination of dehumidication set point and local weather conditions

obtained from the Internet. May over cool your home to achieve the desired

dehumidication set point.

• Both overcooling and dehumidication set point slider adjustment tools are

available for both Max and Climate IQ (Auto). The overcooling adjustment

slider tool limits overcooling between 0ºF to 4ºF.

Humidify + Dehumidify Settings

When this option is selected, a combination of both humidication and

dehumidication settings are available.

When dew point is set to OFF. Then a dual purpose slider adjustment tool

will appear. This tool will allow you to adjust the set point percentage for both

humidication (left slider) and dehumidication (right slider). Range is 15% to

60% humidity.

Table 3. Humidity Control Modes of Operations

Function

Setting

Mode

Description

Humidication Only

Normal

These thermostat modes allow the homeowner

to control the relative humidity (RH) between

15% and 45%. The following conditions must be

met for either mode to operate:

• Humidication mode has been enabled

• Unit is in HEAT mode

• Humidication demand exists

Additionally, the NORMAL mode requires that

heat demand exists.

Max

40%

humidification set−point

45%

15%

Dehumidication

Only

Normal

This setting is recommended when the air

outside is not too humid and the outdoor unit is

either staged or variable capacity.

Max

• Staged Outdoor Unit: This setting is

recommended when the outdoor air is

excessively humid. This setting may cool your

home below the set temperature in order to

remove excessive indoor humidity.

• Variable Capacity Outdoor Unit:

Recommend when the outdoor air is

excessively humid. This setting adjusts cooling

based on installed duct sensor data. This

setting may cool your home below the set

temperature.

NOTE: Discharge air temperature sensor

(catalog number 88K38) is required.

Table 3. Humidity Control Modes of Operations

Function

Setting

Mode

Description

Dehumidication

Only

Climate IQ

(Auto)

This feature is applicable only to Lennox

communicating thermostats with either Lennox

communicating staged or variable capacity

outdoor units only. This setting automatically

adjusts both indoor fan speed and cooling power

based on local climate conditions using Climate

technology. This setting may cool your home

below the set temperature.

The below adjustment tools are only available with either Max or

Climate IQ setting selected.

overcooling

0°F

4°F

2°F

Dehumidication

Only

48%

dehumidification set−point

60%

40%

Humidication +

Dehumidication

15%

40%

48%

humidification set−point + dehumification set−point

60%

Table 3. Humidity Control Modes of Operations

Function

Setting

Mode

Description

Dew Point

Dew point adjustment mode will change the humidication set

point based on the outdoor temperature and a user-dened dew

point adjustment setting.

NOTE: Dew Point - Adjustment requires an outdoor

temperature sensor and is automatically controlled by

the outside temperature.

dew point

15%

−15%

Lennox Variable capacity outdoor units.

Dehumidication Accessory Installed

When either an Auxiliary Dehumidier or Humiditrol equipment is installed

the settings available are Off and Dehumidify. When Dehumidify is selected

a Dehumidication Set-Point adjustment tool is available and allows

adjustments between 50% to 60%.

Smart Zoning System

NOTE: Lennox Zoning Control only work with Lennox communicating systems.

IMPORTANT

The Lennox Smart Room Sensor is not compatible with systems using the

Lennox Smart Zoning System (iHarmony) installed.

For user setting options, go to Menu > Settings > Zoning Control. By default

Zoning is ON on the Zoning Control screen. If you wish to place the system

into central mode then turn this setting OFF. You can also rename each zone

from this screen.

Heating / Cooling Changeover

The following is an example of how the zoning system operates during a

heating / cooling changeover.

When the system is satisfying a call from zone 1 for heating and receives a call

for cooling from zone 2, the following will occur:

• The system will continue to fulll the demand from zone 1 until satised, or a

maximum time of 20 minutes has occurred.

• If after 20 minutes the system is still operating based on satisfying the heating

demand from zone 1, the system will terminate that demand.

• The system will then shut system down for ve (5) minutes. This will allow for

system temperatures and operating pressures to stabilize.

• After a ve 5 minute delay the system will begin operations to satisfy the

cooling demand from zone 2.

The system will continue to operate in this manner each time it receives a zone

call that is opposite of the current mode of operation (heating or cooling).

Cooling Operation

When a zone thermostat makes a demand for cooling, the zone damper opens

and the cooling equipment begins operating.

Cooling demand is terminated when:

1. All zone demands for cooling are terminated.

2. The demand has exceeded the Heat • Cool changeover time limit (20

minutes) while a heat demand exists.

When cooling demand is terminated, a ve minute minimum off time delay is

initiated.

Second stage cooling is energized when the discharge air temperature is 7°F

higher than the set point of the cooling staging temperature settings.

Heating Operation

When a zone thermostat makes a demand for heating, the zone damper opens

and heating equipment begins operating. Heating demand is terminated when:

1. All zone demands for heating are terminated.

2. The demand has exceeded the Heat • Cool changeover time limit (20

minutes) while a cooling demand exists.

When heating demand is terminated, a ve minute minimum off-time delay is

initiated.

Second-stage heating is energized if the discharge air temperature is lower

than the set point of the heating staging temperature set point.

Notications

This section allows the user to setup reminders for various accessories. By

default all listed items are disabled. The reminders can be set for 3, 6, 12 or 24

months and a custom reminder by specic date can be set. Reminders options

are:

• Replace Filter 1 or Replace Filter 2

• Replace UV bulb

• Replace humidier pd

• PureAir maintenance

• Maintenance reminder.

Table 4. Maintenance Alerts

Number Reminder

3000 Filter 1

3001 Filter 2

3002 Humidier Pad

3003 UV Light

3004 Maintenance

3005 PureAir Maintenance

Peak Monitoring

Peak Monitoring is currently a feature requirement for the State of California.

Enrolling into the energy saving program will allow your utility company to

control your thermostat during peak energy events. An icon on the home page

will indicate when the system is in an active energy savings event. Enrollment

is a two-step process for consumers. The rst step requires the consumer to

to take advantage of the Peak Monitoring feature.

Enable Peak Monitoring

Go to Menu > Settings > Peak Monitoring and turn on enable energy savings.

This will automatically get the required certication for your thermostat.

NOTE: If enabling energy savings is successful or not successful a pop-up

screen will appear indicating either. If unsuccessful, try again in a few

minutes.

Enroll in Peak Monitoring

The next screen will allow you to enroll in energy savings. Follow the on-screen

prompts to continue. Detail on-screen instructions are provided.

1. Toggle enable Peak Monitoring to ON. A pop-up message will appear

asking you to rst verify that your utility provider has a Demand Response

Program. If they do, select OK.

2. On the next screen, write down the registration code listed and then select

OK.

3. On this screen, select “enroll Peak Monitoring”, and type in the URL

provided by your energy provider and then select DONE.

4. If enrollment is successful, the next screen will indicate enrollment status

as enrolled and connection status as connected.

Peak Monitoring Settings

This screen will allow you to use your energy provider’s default temperature

or pricing set points. You can also customize these settings by selecting the

following.

1. Peak load event active set-points with the following options:

• Default

• Offset

• Custom set-points

2. Peak Price event Threshold

3. Peak Price Event Active Set-points with the following options:

• Default

• Offset

• Custom set-points

4. Peak Monitoring Events Filter

5. Factory Reset Peak Monitoring Settings - selecting this option will reset

Peak Monitoring settings to factory state.

Canceling Peak Monitoring Event

The option to cancel will appear along the right side of the home screen.

When in an active energy savings event and you attempt to update any of the

following settings, a pop-up window will appear conrming you wish to exit the

active energy savings event which could result in higher energy consumption

during the event period:

• Adjusting the temperature set point manually

• Selecting a schedule

• Changing the mode of operations

• Manually canceling the event from the home screen indicator

Cancel Enrollment

The option to cancel enrollment in Energy Savings can be found by going to

Menu > Settings > Peak Monitoring > Energy Savings Settings > Cancel

Enrollment.

Devices

Lennox Wireless Extenders and Smart Room Sensors can only be added or

removed using the Lennox Thermostat App. For more information concerning

Lennox Smart Devices, see “Lennox Smart Devices” on page 32.

The homeowner can add or remove Lennox Smart Room Sensors and

Lennox Wireless Extenders to the thermostat only if at least one device has

already been added rst by your installer.

NOTE: For more information on setup, placement and pairing of smart room

sensors and wireless extenders, see the Smart Sensor Installation

and Setup Guide provided with the device.

Devices

This section will list the Thermostat and Lennox smart devices such as Smart

Room Sensors, Smart Air Quality Monitor and Wireless Extenders.

Thermostat

Here you can rename your thermostat and information about the thermostat.

Information available in this section includes Model Number, Serial Number,

Hardware Revision, Software Revision and Last Updated.

On the Last Updated screen is the settings for thermostat Automatic Updates

and Check for Updates Now.

By default the Automatic Updates is set to ON.

Smart Devices

The is an alternate location where you can nd information about each device.

See “Lennox Smart Devices” on page 32 for further details available .

Equipment

PureAir™ S

PureAir S is an air purication system that cleans the air in your home by

addressing all three types of indoor air pollutants an:

• Airborne particles (like pollen, dust and pet dander)

• Germs and bacteria

• Chemical orders and vapors

PureAir S uses a MERV 16 air lter, UVA light and catalyst to work.

On this screen you can turn ON or OFF the PureAir S Life. You can also send

a maintenance reminder based on sensor, calendar or run-time.

Ventilation

This option will only appear if a fresh air damper, ERV or HRV is installed and

congured by your installer. Either ERV or HRV could be congured as single

or two-stage if applicable.

Menu Selection

For Ventilation Mode, there are three possible selections which are:

• Installer Settings (Timed) or (ASHRAE). Whether the option is timed or

ASHRAE is determined by how your installer set the parameter default.

• On (always)

• Off (always)

NOTE: Factory default is ASHRAE. Your installer will need to change it to

Timed if that mode is desired.

You can also select “ventilate now” to start a ventilation function immediately.

Those menu options are 10, 20, 30, 40 and 50 minutes, 1 hour, 1-1/2 hours, 2

hours, 2-1/2 hours, 3 hours, 3-1/2 hours and 4 hours and custom. Custom will

allow you to set a specic run-time.

NOTE: On two-speed ventilators, when ventilate now is selected, the

ventilator will come on at high speed.

NOTE: Once ventilation is started, a notication appears on the right-side of

the home screen indicating a time when that specic cycle will end and

an option to cancel the demand.

What is ASHRAE?

ASHRAE 62.2 is a national standard that provides methods for achieving

acceptable indoor air quality in typical residences. It was developed and is

maintained by the American Society of Heating and Air-Conditioning Engineers

(ASHRAE). One of the standard three main components is Whole House

Ventilation which is exhausting stale indoor air and replacing it with fresh

outdoor air.

The exhaust fan dilutes the air in the main living spaces with outside air to

remove unavoidable contaminants from people, pets, cleaning, off gassing,

etc. The whole house fan ow rate is determined based on the oor space and

the number of bedrooms. The whole house fan provides multiple air exchanges

within the home each day. The operation can be continuous or intermittent

(much higher airow cycled by a timer) if 1 zone or less.

For more information about ASHRAE, go to https://www.ashrae.org.

Advanced Settings

This section is for installers and technicians ONLY to customize system settings

and run various diagnostic tests.

View Support Service Control Center

Allows installers and technicians to perform custom congurations tailored for

the homeowner’s unique requirements.

Restart

Options are to restart Smart Hub, thermostat or both.

Unregister System

Unregister System means that your thermostat will no loner be linked to your

email account.

Lennox Smart Devices

Lennox Smart Room Sensor

IMPORTANT

The Lennox Smart Room Sensor is not compatible with systems that have

the Lennox Smart Zoning System (iHarmony) installed.

The Lennox S40 Smart Thermostat can support up to six Lennox Smart Room

Sensors.

Adding and Removing Smart Room Sensor

Please refer to the Smart Room Sensor Installation and Setup Guide for

information on the devices, placement and pairing using the Thermostat App.

IMPORTANT

The rst device must be added by the technician in order to create the smart

devices network. Thereafter the homeowner can add or remove devices

using the Lennox Smart Thermostat App.

View and Understanding the Smart Room Sensor Detail Screen

From the thermostat’s home screen, select the My Home option. Then select

the wireless extender icon. This will display the details for that Smart Room

Sensor.

Figure 17. Smart Room Sensor Detail Screen

• Selecting Current Temp button is a short cut to the Current Temperature.

There you can select which Room Averaging using Occupancy Detection.

• Selecting Sensor Settings will allow you to include or exclude a specic

Smart Room Sensor from temperature averaging. Also listed in this area is

device name, type and about device. Selecting device name will allow you

to rename the device if needed.

Room Averaging using Occupancy Detection

The following two features can be set using either the thermostat or thermostat

app using the system setting screen.

From the home screen, go to Menu > Settings > Current Temperature.

System Settings

Back TV Room

Current Temperature

Wi-Fi

Settings

Devices

Away

TV Room

TSTAT

Battery Sensor

Light Switch

Current Temperature

Fan

Heat/Cool

Humidity

iHarmony Zoning

Notifications

Ventilation

System Info

Feels Like

Peak Monitoring

Thermostat

Off

Laura’s Room

TV Room

Off

Participating Sensors in Temperature Averaging Based on Occupancy

Figure 18. Occupancy Settings for Temperature Averaging

Occupancy Sensor Setting

The occupancy detection feature is built into every sensor. The settings are as

follows:

• OFF - When the occupancy feature is turned OFF, the thermostat will always

include the sensor in temperature averaging.

• ON - When the occupancy feature is turned ON, the thermostat will only

include the sensor in temperature averaging if the room is occupied.

Sensor Temperature Difference Limit

There is feature for temperature averaging that limits how much of a difference

in temperature readings there can be by comparing any Smart Room Sensor

detected temperature to the S40 thermostat detected temperature. By default,

if the smart room sensor temperature reading difference is less or greater than

7ºF, it will be excluded from participating in temperature averaging.

The message “Device is not participating as temperature readings are

abnormally high/low” will appear at the bottom of the Smart Room Sensor

Detail screen.

Verify that the sensor is not in direct sunlight, discharge vents, unconditioned

space or any other types of environmental conditions that could affect the

smart room sensor temperature reading.

NOTE: If the smart room sensor is in a suitable location and the actual room

temperature does not match what the sensor is reporting, then the

smart room sensor may need to be replaced.

Lennox Wireless Extender

Adding and Removing the Lennox Wireless Extender

Please refer to the Smart Room Sensor Setup and Installation guide for

information on the devices, placement and pairing using the Lennox Thermostat

App to the S40 Smart Thermostat. .

View and Understanding the Wireless Extender Detail Screen

From the thermostat’s home screen, select the My Home option. Then select

the wireless extender icon. This will display the details for that wireless extender.

Wireless Signal strength indicators are illustrated as follows:

Figure 19. Wireless Extender Signal Strength Indicators

Lennox Smart Air Quality Monitor

Side Switch

Pairing Button /

Factory Reset

Status Indicator

Status Indicator Light Color Descriptions

NOTE: Light is only on when there is an issue with signal strength.

Table 1. Sensor Light - Two Color Descriptions

Function

Light

Color

Description

Signal

Strength

BLUE

• A solid blue light indicates the signal strength is

low or has lost connection to the thermostat.

• No blue light indicates signal strength is good.

Pairing GREEN

A ashing green light indicates the unit is in pairing

mode.

Adding and Removing the Smart Air Quality Monitor (SAQM)

This device can only be installed by your professional installer. A single S40

Smart Thermostat can support one Lennox Smart Air Quality Monitor.

How the Smart Air Quality Monitor Works

IMPORTANT

The S40 Smart Thermostat will begin displaying information from the Smart

Air Quality Monitor once there is a blower/cooling/heating demand. Until the

rst thermostat demand, the SAQM will indicate it is calculating.

Figure 20. SAQM Calculating

When the Smart Air Quality Monitor detects poor indoor air quality (IAQ) in the

home it will pass that information on to the thermostat which will attempt to

clean the air. Depending on the IAQ equipment installed in the home, one of

the following methods will be used by the thermostat:

• If no IAQ equipment Installed – The thermostat will run the indoor unit

blower to circulate the air.

• High Efciency Filter – The thermostat will run the blower motor to circulate

the air through the lter cabinet.

• Pure Air – The thermostat turns on system to run Pure Air to circulate the

air through the Pure Air system

• ERV / HRV – The thermostat will check outdoor air quality and compare it to

the indoor air quality. If outdoor air quality is better then it will bring in fresh

outdoor air. If outdoor air is poorer it will run the indoor blower to circulate

the indoor air

Side Switch

The primary reason for this switch is to turn off the internal fan in case the

device is installed in a bedroom.

The side switch on the SAQM when in the UP position turns on the internal fan

and transmits air quality data to the thermostat.

When the switch is set to the DOWN position it will turn off the internal fan and

stop air quality data to the thermostat.

An alert code 70003 will be displayed indicating the switch is OFF. The alert

code will automatically clear once the switch has been set back to the ON

position.

While the switch is in the DOWN position, the latest reading from the SAQM

will be displayed on the thermostat. It will not update that information until the

switch is moved back to the UP position.

IMPORTANT

The dealer and homeowner may receive an email indicating that Alert Code

70003 is a no cool, no heat condition. This is not true and the HVAC system

will operate normally. This type of notication is due to alert code being

classied as a Service Urgent.

Denition of Contaminants

Table 5. Terminology

Term Denition

2.5

PM stands for particulate matter (also called particle

pollution), the term for a mixture of solid particles and liquid

droplets found in the air you can breathe. The 2.5 is the ne

inhalable particles, with the diameters that are generally 2.5

micrometers and smaller. Breathable air particles can include

pet dander, bacteria, mode, chemicals form cleaning products,

building materials, fuel-burning equipment such as furnaces,

upholstered goods, cooking, sweeping, copy machines, skin

akes, clothing bers, combustion, cooking, smoke, dust, dirt,

spores, and pollen. Sources vary seasonally.

VOC

Volatile organic compounds (VOC) are a combination of

gases and odors released/emitted/off-gassed from a variety

of sources. VOCs include a variety of chemicals, some of

which may have a short- and long-term adverse health effects.

Alternate terms are odors, gases, vapors and chemicals.

CO2 or carbon dioxide is an odorless, colorless, non-ammable

gas. Carbon dioxide is a by-product of combustion, as well as a

result of the metabolic process in living organisms (for example,

you remove it from your body via the lungs in exhaled air).

Table 5. Terminology

Term Denition

BLE

BLE stands for Bluetooth Low Energy. BLE is a variation

of the Bluetooth wireless standard designed for low power

consumption.

Smart Air Quality Details Screen

From the thermostat home screen, select My Home. Select the Smart Air

Quality Monitor icon to view the current details concerning your indoor air

quality.

Good Air Quality

Fair Air Quality

Poor Air Quality

Poor Network Signal

When the system is cleaning the air an icon will be displayed on the home

screen. There will also be a message listed under the Status screen.

Indoor Level of Air Cleanliness Setting

On the Smart Air Quality Monitor detail screen, select Monitor Settings and

then select Level of Indoor Air Cleanliness. Options are High, Medium and

Basic (most economical).

The intend for these options is to allow the installing technician to ne-tune the

thresholds telling apart Good and Fair air quality. If the technician selects the

High option, this will result in the system triggering cleaning actions at lower

levels of pollutants and contaminants.

NOTE: Only Volatile Organic Compounds (VOC) thresholds will be affected

by these settings.

Likewise, Basic mode will trigger air cleaning at higher levels of VOC compared

to Medium.

View Details and Postpone Cleaning Air

When the Lennox Smart Air Quality Monitor has determined that there is

poor air quality in the home it will run the indoor unit fan or any other indoor

air quality devices installed to clean the air. Selecting this notication on the

thermostat home screen will allow you to view details concerning the air quality

or postpone the air cleaning for a specied time period.

From the thermostat home screen select Cleaning Air and then you have the

option to View Details and Postpone. Selecting postpone will display a screen

where you can select 1, 2, 4, 8 and 24 hours.

Third-Party Integration

The most current information provided by Lennox is available using the QR

codes listed on the QuickStart Guides or product packaging.

Apple, the Apple logo, iPhone and iPad are trademarks of Apple Inc. registered

in the US and other countries.

Android is a trademark of Google Inc. Use of this trademark is subject to

Google permission.

Amazon, Echo, Alexa and all related logos are trademarks of Amazon.com,

Inc. or its afliates.

IMPORTANT

For any of these third party applications to work with your thermostat, the

thermostat MUST be connected to the Internet and you MUST be logged into

your Lennox Thermostat account.

Amazon Alexa

Download the Amazon Alexa app from Google Play or the App Store™ on a

compatible phone or tablet. Then follow the on-screen stops to nish setup.

Once you have added the thermostat to your Amazon Alexa app, then you can

use Siri

to voice control.

Changing to Celsius

Using your Amazon Alexa mobile app, select the three bar icon in the upper

left-hand of the screen.

1. Select Settings.

2. Choose your Amazon device.

3. Select Measurement Units from the menu.

4. Toggle ON Temperature Units - Use metric measurements for temperature

units.

NOTE: Even though your Lennox thermostat supports half degree settings

in Celsius, Alexa only supports whole degrees. The rst temperature

adjustment that gets made will set the temperature to a whole degree,

if it was not already.

Heat and Cool (Auto-Changeover)

Alexa will control your thermostat a bit differently when in Heat / Cool mode. In

Heat / Cool mode the system can automatically switch between heating and

cooling as needed.

For instance, if you ask Alexa to set the hallway temperature to 70 degrees,

your thermostat will use this as a midpoint temperature, setting the Heat set

point to 69 and Cool set point to 72. Alexa will conrm your request, saying

“Hallway is in auto mode, aiming for 70 degrees”.

NOTE:

1. You cannot change the mode (heat only, cool only, etc.) of your thermostat

using Alexa.

2. If your thermostat is in ‘away’ or ‘smart away’ mode, any Alexa commands

to change thermostat temperature will not work in this mode.

3. Currently, you can pair only one home that is listed in your Lennox User

Account with Alexa. In the situation where you have multiple homes

associated with your Lennox thermostat account, you will not have a

choice to choose the home for Alexa. You can check the homes on your

account by visiting:

Additional Help

Amazon’s on-line help at https://alexa.amazon.com.

Google Home and Assistant

Download the Google Home app from Google Play or the App Store™ on a

compatible mobile device and then follow the on-screen steps to nish setup.

Once you have added the thermostat to your Google Home app, then install

and enable the Google Assistant app (Android and IOS) to enable voice control.

NOTE: Google Assistant app may be already installed on your Android device.

Perfect Temp and Schedule Mode Functions

Raising or lowering the temperature is not supported when using a schedule

or Perfect Temp feature. When attempting to change the temperature when

in either reference mode, Google Assistant will respond with “mode not

supported“.

Heat / Cool Mode (Auto-Changeover)

Although Google Assistant supports heat / cool mode temperature adjustments,

it will do so only by maintaining the currently established temperature ranged.

For example, if you set your heat set point to 60ºF and your cooling set point to

80ºF at the thermostat itself, then you have established a temperature range

of 20 degrees. Any adjustment using Google Assistant, either through the

app or by voice will maintain a 20 degree range differential as well. Let’s say

you change your heat set point to 65ºF. Now your thermostat will indicate the

heating is at 65ºF and cooling is set at 85ºF.

Adjusting the cooling set point will result in the range being maintained as

well. In the Google Home app, the thermostat image will only display the

approximate center temperature between the current heating and cooling set

points. In this example it would display 75ºF.

Additional Help

Google’s Online help at https://support.google.com/googlenest/gethelp.

Control4

Smart Home | Operating System

Control4 is a leading control and automation platform which works with

thousands of smart devices integrating audio, video, lighting, security, intercom,

and climate control into a seamless customer experience

Control4 gives the customer an easy-to-use interface to control any Lennox

Smart Thermostat.

Settings include:

• Display all systems in the home and select a system

• Display all zones in the system and select a zone

• Turn system or zones on or off

• Change manual modes (heat, cool, off)

• Change heating/cooling set points for each zone/system

• Change fan mode (on, auto, circulate)

For additional information please visit https://www.control4.com.

Building36

BUILDING36 PRACTICAL HOME AUTOMATION

Building36 is a leading control and automation company that delivers next-

generation smart home solutions which work with thousands of smart devices,

integrating control for HVAC, water, video, lighting/appliance and security into

one location.

Building36 gives the customer an easy-to-use interface via the Building36

Dashboard or the Building36 Home Mobile App to control the Lennox’ S40

thermostat.

Settings include:

• Display all systems in the home and select a system

• Display all zones in the system and select a zone

• Turn system or zones on or off

• Change manual modes (heat, cool, off)

• Change heating/cooling set points for each zone/system

• Change fan mode (on, auto, circulate)

For additional information please visit https://building36.com.

Alert Code Priority Types and Notication Options

To expand a specication notication to access a more detailed description of the alert code, press the down arrow.

Table 6. Alert Code Priority Condition Visibility

Alert Priority Alert Priority Description n

Notications Displayed or Email Notications Sent

Displayed for

Homeowner on

Thermostat

Displayed for Dealer

on Thermostat

Lennox

S40

Smart Thermostat

Application

Lennox

Smart

Technician Service

Application**

LennoxPros Service

Dashboard**

Homeowner

Emailed*

Dealer Emailed

Service

Urgent

Your system is in a No Heat/ No Cool

or not operating. Dealer service call is

needed to get the system running.

√ √ √ √ √ √ √

Service

Soon /

Service

Urgent

This alert priority indicates that the system

will likely recover on its own and no

interaction is necessary. Typically, either

after a specic timer period or a specic

number of instances, some Service Soon

alerts will escalate to Service Urgent.

X √ X √ √ X X

Service

Soon

System is not reaching set point or is

partially operating. A Dealer will need to

service it with 24-48 hours.

X √ X √ √ X X

Maintenance

Maintenance alerts are those intervals

you put in the thermostat as reminders to

change lters, replace UV lamps, tune up

systems.

√ X √ X √ X X

Information

Only-Dealer

This alert priority is for information and is

directed to the dealer.

X √ X √ X X X

* For homeowner to receive email notications, email updates has to be enabled. From the home screen, go to menu > user account > Email updates and

set to ON.

** For dealers to receive service alerts and service alert emails the feature needs to be enabled by the homeowner. From the home screen, go to menu >

user account > Dealer Email updates and set to ON.

FCC Statements

FCC Compliance Statement — PART 15.19

This device complies with Part 15 of the FCC Rules. Operation is subject to the

following two conditions:

1. This device may not cause harmful interference, and

2. This device must accept any interference received, including interference

that may cause undesired operation.

FCC Interference Statement — PART 15.105 (B)

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 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 Information

This device meets the FCC and ISED requirements for RF exposure in public

or uncontrolled environments.

Canada License-Exempt RSS Standard(s) Operation

This device complies with Industry Canada license-exempt RSS standard(s).

Operation is subject to the following two conditions:

(1) this device may not cause interference, and

(2) this device must accept any interference, including interference that may

cause undesired operation of the device.

Changes or modications not expressly approved by the party responsible for

compliance could void the user’s authority to operate the equipment.

Index

Advanced Diagnostics and

Troubleshooting 19

Advanced Settings 31

Alert Code Priority Types 38

Alerts and Notications 19

Allergen Defender 4

Ambient sensor 4

ASHRAE 31

Auto Brightness 18

Celsius 36

Central Mode 28

Cleaning Air 17

Cleaning Air - Postpone 36

Clean Screen 18

Climate IQ® 4

Creating Account

Using Lennox Thermostat App 8

Using Thermostat 8

Date and Time 12

Dehumidication Accessory Installed 26,

Dehumidication Control Center 26

Devices 30

Display Features 4

Display Settings 18

Email Updates 18

Energy Savings Status 17

Fan 25

Fan (On, Auto and Circulate) 21

Features 4

Feels Like 4, 24

Heat • Cool 25

Home Screen 11

Humidication Control Center 26

Humidify + Dehumidify 26

Humiditrol® 5

Humidity Control 26

Humidity Control Modes of Operations 27

Humidity sensor 4

Icons (screen)

Ambient Lockout 15

Away 14

Coasting to Perfect Temp 16

Cooling 14

Defrosting 15

Dehumidifying 14

Emergency Heat 15

Energy Savings 29

Fan Set to Auto 15

Fan Set to Circulate 15

Fan Set to On 17

Heating 14

Humidifying 14

Load Shedding, Wait Time 45 min 16

Menu 14

Schedule Hold Until Next Period 17

System Under Test 16

Transitioning to Next Schedule 17

Will Start Soon 15

Indoor Humidity 18

Lennox Dealer Support Access 19

Lennox Smart Air Quality Monitor 13, 33

Lennox Smart Devices 32

Lennox Smart Room Sensor 13

Lennox Wireless Extender 13

Local Lennox Dealer Info 19

Menu 17

General 18

System 19

Micro USB 4

Mobile Device Location Services 23

Monthly Report Email 18

Move Out 18

Occupancy Sensor Setting 32

Outdoor Weather 18

Peak Monitoring 29

Perfect Temperature 4, 25

PureAir 29

PureAir S 5, 12, 13, 30

Reboot button 4

Received Signal Strength Indication (RSSI)

Remote Sharing 19

Room Averaging using Occupancy

Detection 32

S40 and S30 Thermostats 6

Safety Protection 25

Schedule IQ 4

Schedules 19

Screen Lock 18

Screen Saver 18

Settings

Advanced Settings 29

Away 22

Energy Savings 29

Fan 25

Heat • Cool 25

Notications 29

Ventilation 30

Wi-Fi 22

Smart Away 4, 23

Away Set Points 23

Inner and Outer Away Fences 23

Mobile Device Location Services 23

Multiple Mobile Devices 23

Transition Set Points 23

Smart Devices 32

Smart Zoning System 28

Cooling Operation 28

Heating / Cooling Changeover 28

Heating Operation 28

System Mode 19

Third-Party Integration 36

Time and Date Display 12

Unregister System 31

Updates 30

Automatic Updates 30

Check for Updates Now 30

User Account 18

Ventilation 30

ASHRAE 31

Home Screen Icons 16

Settings 30

Timed 30

Wi-Fi

Access Point Hidden 6

Signal Strength Indicator 7

Wi-Fi Considerations 6

Wi-Fi Network Types Supported 6

Wireless Extender 33