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Other Features
Automatic Software Upgrades
When the XL824 is connected to a Nexia™ Home
Intelligence account, software upgrades will
occur automatically and do not require user
intervention.
Manual Software Upgrades
The software may also be manually upgraded.
This procedure requires a computer with an
Internet connection, a USB Flash Drive and the
included USB connector. From your computer,
go to www.Trane.com/residential and select
Thermostat & Controls. Click on the XL850, select
Download Latest Version Software and follow the
on-screen prompts.
Smart Optimization
The 850 Control is equipped with Smart
Optimization. By executing a series of blower
and active call on/off tests, Smart Optimization
will customize the 850 Control to each unique
environment and increase the accuracy of the
sensed indoor temperature and overall system
performance.
Smart Optimization is enabled by default and will
automatically execute approximately 18 hours
after initial power up. Smart Optimization takes
90 minutes to complete and during the process,
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heating and cooling operations are disabled.
The screen will indicate that the 850 Control is in
Smart Optimization mode.
To delay Smart Optimization for an additional 18
hours, touch the 850 Control Screen and hold for
five seconds.
To disable Smart Optimization altogether,
navigate to Home>Smart Optimization and
select Disable and press Apply.
To enable Smart Optimization, navigate to
Home>Smart Optimization and select Enable
and press Apply. Smart Optimization will execute
in approximately 18 hours.
To manually trigger Smart Optimization, first
disable, then re-enable the feature.
824 User Guide
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