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When performing a valve rebuild
as well as Allied and Armstrong units
While these are high-temp gaskets rated for 300°F
or cracked heat exchangers that cause internal temperatures to exceed the 333-degree rating
Carrier HH12ZB240 Limit Switch When performing a valve rebuildThe Carrier HH12ZB240 is a high limit OEM replacement part engineered for precise thermal regulation and safety in Carrier, Bryant, and Payne gas furnaces. As a normally closed (NC) switch, it is designed to protect the heat exchanger from damage caused by restricted airflow or blower failure. This auto limit switch functions on a specific thermal cycle, opening the circuit when internal temperatures reach 240F to interrupt the gas valve and closing
