Lennox 55W64 Pressure Switch

The Lennox 55W64 High Pressure Switch is an essential safety and operational component designed for high-pressure monitoring in residential and commercial HVAC systems. This genuine OEM replacement part ensures your equipment operates within safe parameters, specifically engineered to actuate at 590 PSI and features an automatic reset at 418 PSI. As the direct replacement for discontinued models 30W18 and 30W1801, this switch maintains the integrity of the original system design without requiring extensive field modifications. Built with a normally closed (N.C.) configuration and 1/4" SAE female flare connection, the 55W64 is frequently utilized in heat pump and air conditioning applications to protect the compressor from excessive discharge pressure. The robust housing is designed for longevity in demanding environments, while the 45-inch lead length provides flexibility for various cabinet orientations. Technicians can rely on this HVAC pressure switch for consistent repeatability and precise electrical performance, rated for 120/240VAC at 5.8 FLA to ensure seamless integration with existing control boards and safety strings.

• Direct Compatibility: Seamlessly replaces legacy Lennox 30W18 and 100103-05 parts, saving time on-site during emergency repairs.
• High-Pressure Protection: Prevents compressor damage by monitoring for 590 PSI trip points, a critical safeguard for modern high-efficiency systems.
• Automatic Reset Function: Features a calibrated reset at 418 PSI, reducing nuisance lockouts while maintaining strict system safety.
• OEM Reliability: Unlike generic alternatives, this Lennox replacement part meets exact factory specifications for electrical ratings and pressure tolerances.

Is the 55W64 compatible with older Lennox heat pumps?
Yes, this switch is the official direct replacement for the 30W1801 and 30W18 series. It is designed to fit a wide range of models, including the 14HPX and TPA series.

What is the reset type for this pressure switch?
This is an automatic reset high pressure switch. It will trip when pressure reaches 590 PSI and will automatically close the circuit once the system pressure drops back down to 418 PSI.

Why is my high pressure switch tripping?
In cooling mode, common causes include a dirty outdoor coil, a failing condenser fan motor, or non-condensables in the refrigerant line. Always verify system pressures with a manifold gauge set before assuming a switch failure.

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.