Lennox 79J07 Pressure Switch

Verify high-side and low-side performance with the Lennox 79J07 Pressure Switch, a critical OEM replacement part designed for precision low ambient control in R22 and modern refrigeration and air conditioning systems. Engineered for heavy-duty commercial HVAC maintenance and residential applications, this 79J0701 compatible switch ensures your compressor remains protected during low-temperature operations. With a fixed setpoint that opens at 150 PSI and closes at 275 PSI, it effectively manages condenser fan cycling to maintain head pressure, preventing evaporator freeze-ups and ensuring consistent cooling capacity. As a veteran-grade HVAC pressure switch, its robust construction withstands harsh environmental vibration and thermal cycling, making it the standard choice for contractors looking to restore factory-spec Lennox system performance. Whether you are troubleshooting a tripping pressure switch or performing a preventative low ambient kit overhaul, the 79J07 provides the reliable electrical continuity and mechanical response required for long-term system integrity.

• Factory-Calibrated Precision: Features a 150 PSI open and 275 PSI close differential for optimized head pressure control.
• OEM Direct Drop-In: Fully interchangeable with Lennox part number 79J0701, ensuring zero-clearance fit and terminal compatibility.
• Extended Component Life: Minimizes compressor stress by preventing rapid cycling and maintaining stable refrigerant pressures in low ambient conditions.
• Universal Application: Suitable for a wide range of Lennox units, including KGA, LCA, and LHA series models.

Is the 79J07 identical to the 79J0701?
Yes, the Lennox 79J07 and 79J0701 are the same physical and technical part. They share identical pressure setpoints and electrical ratings.

What symptom indicates a failing low ambient pressure switch?
Technicians typically see the condenser fan failing to cycle on as head pressure rises, or the fan remaining off during low outdoor temperatures, causing the high-limit switch to trip.

Can this be used on R410A systems?
While originally common in R22 systems, always verify your specific model's pressure requirements. This switch is calibrated for 150/275 PSI; if your system specs match these setpoints, it will function as intended.

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.