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Look for a bulging top
and Airquest
use a manometer to verify the vacuum is greater than
Key Benefits Factory-Authorized Safety: Provides OEM Bard replacement reliability to maintain the original safety certification of your HVAC equipment
Its snap-action contact design provides a reliable electrical interface with the integrated furnace control
Williams P321826 Limit Switch Look for a bulging topThe Williams P321826 Limit Switch is a critical safety component designed specifically for Monterey Counterflow Top Vent Furnaces, including the 250, 350, and 500 series. As a veteran technician knows, maintaining the integrity of the vent safety shutoff system is non negotiable for preventing flue gas spillage and potential carbon monoxide hazards. This replacement vent limit switch is engineered to monitor exhaust temperatures and will break the