773-134

This high-altitude pressure switch is a vital safety component designed for two-stage gas furnaces operating in elevated environments. As an air-proving switch, it monitors the venting system to ensure the inducer motor is creating the correct vacuum pressure before allowing the heating cycle to begin. Calibrated specifically for the thinner air found at higher elevations, this dual-stage switch features trip points of 0.50" WC and 0.85" WC to maintain precise performance during both low-heat and high-heat cycles. Replacing a faulty pressure switch can resolve common furnace issues such as ignition failure, intermittent cycling, or error codes related to airflow restricted venting.
Type: Air Pressure Switch
Size: Small
Application: High-altitude residential two-stage gas furnaces and HVAC heating systems.
Specifications: Dual-stage configuration; Low-stage setpoint: 0.50" WC; High-stage setpoint: 0.85" WC; High-altitude calibrated; Air-proving safety functionality.