TCO1 is located in the burner section below the burner assembly:
See the picture below for the TCO2 location. TCO2 is located on the side of the supply fan frame and requires the roof to be removed to access it. This was the last location for TCO2 up until production stopped for Legacy Precedent in December 2024.
On some older Precedent unit with Plenum Fan, TCO2 may be mounted on the back of the fan motor mounting plate. This location is rare and is typically only found on units with a Gen 2 EBM Plenum Fan.
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Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.