Lennox 38M77 Pressure Switch R-407A System Reliability: Precision-matched 120V/300W electrical

System Reliability: Precision-matched 120V/300W electrical specifications facilitate stable gas furnace ignition and reduce maintenance downtime

As a genuine OEM #75 restrictor orifice

Universal Compatibility: Engineered for use with A2L refrigerants and high-pressure legacy gases

this adjustable air differential switch is frequently used to prove airflow in exhaust systems by sensing the pressure drop across the fan

for continuous backlighting and optimal performance in heat pump applications

Lennox 38M77 Pressure Switch R-407A System Reliability: Precision-matched 120V/300W electricalThe Lennox 38M77 High Pressure Switch is a critical OEM safety component designed for R 410A HVAC systems. Engineered to monitor discharge line pressure, this switch prevents compressor damage by interrupting the control circuit when pressures exceed safe operating limits. With a factory calibrated trip setting of 640 psi and a reset threshold of 475 psi, it ensures precise high limit protection in commercial and industrial rooftop units and split