773-105

The American Standard and Trane Pressure Switch is a vital safety component engineered for residential gas furnaces and HVAC systems. As an air proving switch, its primary function is to monitor the negative pressure created by the draft inducer blower, ensuring proper airflow through the heat exchanger before ignition. This switch is calibrated to a precise 1.29" WC (Water Column) set point, serving as a fail-safe that prevents the heating system from operating if a venting obstruction or mechanical failure is detected. Ideal for repairing furnaces that are cycling incorrectly or failing to ignite, this high-quality pressure sensor helps maintain the efficiency and safety of your indoor climate control system. Durable and reliable, it is a standard replacement part for maintaining optimal combustion air levels.
Type: Air Pressure Switch
Size: Standard furnace component
Application: Used in gas-fired furnaces and HVAC units to verify proper venting and inducer motor operation.
Specifications: Set Point: 1.29" WC (Water Column); Function: Normally Open, closes on pressure rise; Application: Air Proving Safety Switch.