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this adjustable air differential switch is frequently used to prove airflow in exhaust systems by sensing the pressure drop across the fan
a failed pressure switch circuit
this kit resolves common intermittent pilot ignition failures and ensures reliable flame sensing performance in demanding hydronic applications
Is this valve a tight shut-off
Lennox 38M77 Pressure Switch R-407A this adjustable air differential switchThe 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
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