American Standard equipment comes with a factory Base Warranty.
To get a longer free factory Warranty the equipment must be Registered within 60 days of installation.

Base Warranty: Check the equipment paperwork for the warranty or the Product Warranty Handbook.

Registered Warranty: Within 60 of installation go to www.AmericanStandardAir.com and click on Owner Support then Warranty & Registration.

The homeowner or installing dealer can Register the equipment.

Product Warranty Handbook of Equipment Time Periods

PDF - Product Warranty Time Periods Handbook limited warranty terms and conditions 2016 pdf.

The dealer can log into www.ASDealerNet.com and perform a Serial Number Lookup.
There it will display if the equipment only has a Base Warranty or if the equipment has been Registered with the effective dates.

OR

The dealer or homeowner can go to www.AmericanStandardAir.com and click on Owner Support then Warranty & Registration.
Click on the Confirm that you're registered.

If the results come back with no matching serial number then only the Base Warranty is in effect.
See the Product Warranty Handbook for the Base Warranty.