15
3. Gently press on the edges of the thermostat until you hear the mounting
snaps engage. Be careful not to apply force directly on the glass.
NOTE: Once the thermostat is connected, it may take up to 45 seconds for it
to power up.
4. To remove the thermostat from the sub-base, grasp the left and right edges
of the thermostat and gently pull towards yourself.
NOTE: If the thermostat is removed from the sub-base, the thermostat will
shut down and will not be able to communicate with the system.
System can be controlled from mobile devices once registration has
been completed.
5. Do not remove the label covering the thermostat screen until after power
is applied to the system.
Commissioning using the Lennox
®
Smart Technician
This application tool is used by dealers to commission a S40
smart thermostat using a Wi-Fi enabled mobile device.
A temporary direct Wi-Fi connection is created between
the mobile device and thermostat using the Lennox Smart
Technician App.
NOTE: The Lennox Smart Technician App only connects locally while within
Wi-Fi range of the thermostat. The app cannot connect through the
home Wi-Fi network or Internet.
To use the Smart Technician app, the mobile device must be:
• Wi-Fi capable
• Located in the home near the thermostat
NOTE: A router with Bonjour capabilities is required for this function. Check
the router features if the thermostat does not connect. Apple Bonjour
®
is an implementation of zero-conguration networking (Zeroconf),
a group of technologies that includes service discovery, address
assignment, and host name resolution.
Mobile Device Operating System Requirements
The Lennox Smart Technician App is available for both IOS 11.0 or higher
(App Store) and Android 9.0 or higher (Google Play).
Establishing a Direct Wireless Connection to the Thermostat
IMPORTANT
If the connection between the Lennox Smart Technician App and thermostat
is idle for three (3) minutes, the thermostat will auto-disconnect from the
mobile device. Repeat procedures to reconnect.
1. Apply power to the thermostat.
IMPORTANT
After applying power to the thermostat a “System Under Test” screen appears,
it could indicated either the system is under reconguration or is unable to
communicate with the indoor unit. Check wiring connections between the
thermostat wall plate and indoor unit for loose or incorrect connections.
NOTE: When Lennox controls are congured for a communicating system,
all jumpers and links setting on the controls are ignored. Jumpers and
links setting are treated as defaults and would only be active if the
system was congured as a non-communicating system.
2. A Welcome screen will appear. Select the desired language to be used.
Options are English, Franҫais and Español. Select the right arrow to
continue.
3. On the Choose Setup Route screen there are two options:
» Continue setup process through the thermostat
» Continue setup process through the mobile app
Select option 2 and select the right arrow to continue.
4. The Download Lennox Smart Technician App screen will appear on the
thermostat. On that screen you can scan the QR code with your mobile
device to download the Lennox Smart Technician App from either App
Store or Google Play. If the app has already been installed, select the right
arrow to continue and proceed to step 6.
5. Once the Lennox Smart Technician App has been downloaded and
installed on your mobile device. Return to the thermostat and select the
right arrow to continue.
6. The next screen is the Connect Thermostat with Lennox Smart
Technician App. Select the Start button to continue.
7. The next screen is the Thermostat ID broadcasting screen. Start the
Technician Service App. Follow the screens on the Lennox Smart
Technician App.
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