4
Downloading Lennox Smart Applications
Scan the QR codes listed below to download the specic application you
desire.
Lennox Smart Technician App
Google Play
(Android
TM
)
App Store
(iOS)
Lennox Smart Thermostat App
Google Play
(Android
TM
)
App Store
(iOS)
Service and Support - Service Access and Remote In
IMPORTANT
Protect homeowner investment and peace of mind with active monitoring of
system operations through the Lennox S40 Smart Thermostat. This feature is
free of charge and provides basic maintenance reminders, alerts homeowner
of potential issues, and can even allow the homeowner to remotely share
diagnostics with the Lennox dealer to troubleshoot and x problems. This
proactive care helps eliminate downtime and avoid unnecessary service
visits and repair costs, ensuring nothing short of perfect air.
Please share this information with homeowner as you ask them to accept the
Advanced Diagnostics & Remote sharing permissions.
With the homeowner’s permission, use the following procedure to enable
remote access and diagnostics.
From the thermostat home screen, go to Menu > Support Services and under
Local Lennox Dealer Info verify that all of the elds have been completed.
Then select Service Access and enable Remove View and under Remote
Control select On / Always. In addition enable Alerts and Notications.
THERMOSTAT
(SIDE VIEW)
3/4”
(18.4)
SUB-BASE
(FRONT VIEW)
1/4” (6.5
SUB-BASE
(SIDE VIEW)
THERMOSTAT (FRONT VIEW)
Inches (Millimeters)
7”
(179)
4-1/2”
5-7/8” (147)
3-1/2” (89)
Figure 2. Thermostat and Sub-Base
Thermostat Terminal Information
Table 2. Terminal Designations and Wiring Recommendations
Terminal
Designation
Description Thermostat Wiring
R 24VAC input 18AWG unshielded
I+ RS-BUS I+ 18 - 22AWG unshielded or shielded
NOTE: Shielded wiring may be required in some rare
situations. Use two-conductor shielded cabling.
I- RS-BUS I-
C 24VAC return 18AWG unshielded
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