How do I connect my XL824 to my Wi-Fi network?
Navigate to Home > Menu > Settings > Network > Connect to WiFi Network, then select your network and enter your password and select Connect. Alternatively, you can use WPS by pressing the WPS button on your router and then selecting the Wi-Fi Protected Setup button on the Wireless Network screen. If your network is not visible, select Hidden Network at the end of the list and manually enter your network name (SSID) and password.
From the official Trane XL824 Smart Wi-Fi Thermostat manual, page 22
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