Lennox 79J08 Pressure Switch

For service calls involving residential or commercial HVAC equipment, the Lennox 79J08 Suction Pressure Switch is the direct OEM replacement for maintaining critical system safety and efficiency. This low pressure switch is factory-calibrated to actuate at 25 PSI and features a reset point of 55 PSI, making it a vital component for protecting the compressor against low-charge conditions or evaporator freeze-ups. Engineered specifically for R22 refrigerant systems, this SPST-N.O. suction pressure switch ensures the compressor only operates within safe parameters, preventing oil slugging and terminal failure.

Replacing an aging or fouled HVAC pressure switch with this genuine Lennox 79J0801 part restores original factory specifications to the unit. The assembly includes 12-inch leads for straightforward integration into existing control circuits and is rated for 120/240 VAC applications with a 6 Amp FLA capacity. Whether you are troubleshooting a unit that won't initiate a cooling cycle or performing preventative maintenance on a legacy Lennox refrigeration system, utilizing real OEM HVAC parts ensures the suction pressure sensing remains accurate for long-term operational reliability.

• System Protection: Precisely monitors suction pressure to prevent compressor operation during low-refrigerant or restricted airflow scenarios.
• OEM Compatibility: Designed as a drop-in replacement for Lennox HVAC equipment, including popular LCA and LGA series units.
• Reliable Calibration: Maintains a fixed 25# set point for consistent performance across high-demand heating and cooling applications.
• Durable Construction: Built to withstand the vibrating environments and thermal cycling common in commercial condensing units.

• How do I verify if the 79J08 was the cause of a system lockout? Technicians should check for continuity across the terminals when the system reached the 55 PSI reset threshold; an open circuit below 25 PSI is normal operation to protect the compressor.
• Is this switch compatible with R410A systems? No, the Lennox 79J08 is specifically calibrated for the pressure curves of R22 systems; using it with higher-pressure refrigerants will lead to improper cycling.
• What are the symptoms of a failing suction pressure switch? Common signs include the compressor failing to start despite a call for cooling, or frequent short-cycling that cannot be attributed to thermostat or contactor issues.

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.