The external equalizer compensates for any pressure drop through the evaporator coil

Industrial Grade Build: Features a durable sensing diaphragm resistant to thermal cycling in demanding mechanical rooms

Common Questions & Technical Support What is the exact rotation for this model

Equipped with brass trim and a reliable spring return actuator

Lennox 38M77 Pressure Switch 323613-751 The external equalizer compensates forThe 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