Lennox 84M96 Pressure Switch

The Lennox 84M96, also identified as model 100216-01, is a high-precision loss of charge pressure switch engineered to safeguard compressors against the catastrophic effects of low refrigerant levels. As an essential HVAC safety control, this switch continuously monitors the system's low-side pressure, automatically cutting the 24VAC circuit to the contactor if levels drop below critical thresholds. This prevents the compressor from operating in a vacuum or overheating due to insufficient mass flow. Designed for Lennox OEM compatibility, the 84M96 is calibrated to actuate at 55 PSI and features an automatic reset at 25 PSI, ensuring the system remains locked out during a significant leak until the charge is professionally restored. The unit is equipped with 45-inch leads and a 125VA contact rating, allowing for versatile positioning and secure integration within residential and light commercial condensing units.

• System Protection: Actively prevents compressor burnout and mechanical failure by detecting a loss of refrigerant charge early.
• OEM Precision: Calibrated with a 55 PSI trip point and 25 PSI reset for reliable performance across Lennox and Allied Air platforms.
• Durable Construction: Built to withstand high-cycle environments with a robust normally open (NO) configuration and high-grade internal diaphragms.
• Simplified Installation: Features pre-stripped 45-inch leads for easy field wiring into the safety loop.

What causes a loss of charge switch to trip?
A trip typically indicates a refrigerant leak, a failed thermal expansion valve (TXV), or a severely restricted liquid line filter drier that has reduced the suction pressure below the 55 PSI threshold.

Can I bypass this switch during troubleshooting?
While technicians may briefly shunt the leads for diagnostic testing to confirm a failed pressure switch, the system must never be left in operation without a functional safety switch, as this risks permanent compressor damage.

Is the 84M96 compatible with R-410A systems?
Yes, this component is designed for modern high-pressure systems, providing a critical layer of defense for Lennox AC units and heat pumps utilizing R-410A or other standard refrigerants.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.