Williams P322055 Vent Safety Switch it requires a technician to

it requires a technician to physically inspect the system and identify the root cause of the trip—such as a cracked heat exchanger

allowing technicians to inspect or clean the internal valve plug without replacing the entire unit

and a Propane (LP) orifice is included in the packaging for easy conversion

ensuring precise modulating control for 1/2-inch and 3/4-inch valve bodies utilizing a 5/16-inch stroke

The dual hubs allow the transformer to be mounted directly to a standard electrical knockout

Williams P322055 Vent Safety Switch it requires a technician toFor contractors servicing Williams Monterey Counterflow Top Vent Furnaces, the Williams P322055 Vent Safety Switch is the code compliant OEM replacement required to maintain the integral safety loop. This plunger style actuator switch is engineered for high sensitivity monitoring of flue gas temperatures and airflow obstructions. Designed for specific 35,000 BTU Monterey models, including units 3509821 and 3509822, it functions as a critical vent