1. Verify the thermostat is in Wi-Fi Connection mode based on the radio bars “strobing” as shown above.
2. Using a Wi-Fi enabled computer, establish a Wi-Fi connection to the thermostat as you would to any public Wi-Fi network. You may receive a warning that there doesn’t appear to be internet connected with this device. This is okay. Accept the warning and proceed with the connection.
3. Open a web-browsing app and enter the URL 192.168.1.99/index.html into its location bar. Do not use your browser’s search function for this URL. The following screen should appear. (Note:If the blue screen does not appear, please confirm that you are still connected to the thermostat in the thermostat via your Wi-Fi controls.)

4. The thermostat will disconnect automatically from your computer and connect to your home network. The Wi-Fi icon on the thermostat will indicate this by changing to solid bars. If the thermostat fails to connect and instead returns to a strobing icon, as indicated in Step 1, return to Step 2, and verify that the password being entered is correct.

5. Open the Aprilaire App and log into your account. If this is the first thermostat being added to your account, the app will display the screen below. If that screen does not appear, press Menu and then Assign Thermostat to User Account.

6. The thermostat will disconnect automatically from your computer and connect to your home network. The Wi-Fi icon on the thermostat will indicate this by changing to solid bars. If the thermostat fails to connect and instead returns to a strobing icon, as indicated in Step 1, return to Step 2, and verify that the password being entered is correct.
7. Open the Aprilaire App and log into your account. If this is the first thermostat being added to your account, the app will display the screen below. If that screen does not appear, press Menu and then Assign Thermostat to User Account.

8. Enter the mandatory fields (indicated by *) and manually enter the MAC ID that was noted in step 5 above. (Note: Do not enter any dashes or colons appearing between the number and letter pairs.) Press Done when finished.