773-081

This premium two-stage air pressure switch is a critical safety component designed for high-efficiency gas furnaces. Functioning as an air proving sensor, it monitors the negative pressure generated by the inducer motor to ensure that exhaust gases are being safely and effectively vented out of the system. This dual-stage switch is specifically calibrated to handle the varying airflow requirements of multi-stage heating systems, maintaining system integrity during both low-fire and high-fire operation. If the switch detects an obstruction in the flue or a failure in the venting process, it will prevent the furnace from igniting to ensure home safety. Replacing a faulty or sticking pressure switch is a common fix for furnace ignition failures, system lockouts, and pressure-related error codes in modern HVAC equipment.
Type: Air Pressure Switch
Size: Standard
Application: Used in residential two-stage high-efficiency gas furnaces to monitor venting pressure and ensure safe combustion cycles. Ideal for forced-air heating systems requiring dual-stage vacuum sensing.
Specifications: Dual-stage configuration; Stage 1 activation at -0.92 inches Water Column; Stage 2 activation at -1.47 inches Water Column; Diaphragm-style vacuum sensing; High-sensitivity electrical contacts for reliable signaling.