Williams P322055 Vent Safety Switch The Siemens 243-0018 is a

The Siemens 243-0018 is a non-adjustable logic relay

This gasket is the primary valve seal for Series 53

When replacing a brittle or clogged HVAC drain tube

Using a multimeter

Williams P322055 Vent Safety Switch The Siemens 243-0018 is aFor 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