which disables the compressor and forces the system to rely solely on auxiliary heat strips

fan speed control

they often have different trip ratings

it prevents "ghost" error codes on the main logic board that are often caused by slight voltage drops when the inducer or blower kicks on

or 60-minute intervals

Lennox 49K66 Gasket 322838-752 which disables the compressor andThe Lennox 49K66 PVC Collector Box Gasket is a critical OEM replacement part engineered specifically for high efficiency Lennox furnaces. This 19 inch PVC gasket provides an airtight seal between the collector box and the heat exchanger, preventing the leakage of combustion byproducts and ensuring the integrity of the secondary heat exchanger assembly. Designed for long term durability in high moisture condensing environments, the 49K66 is essential