Lennox 42W59 Reversing Valve

The Lennox 42W59 Reversing Valve is a genuine OEM 4-way brass heat pump valve specifically engineered to transition refrigerant flow between heating and cooling cycles. Designed for high-pressure R-410A systems, this SHF Series reversing valve features 1/2" x 7/8" ODF (Outside Diameter Female) sweat connections, ensuring a leak-resistant seal during brazing. Utilizing a 24V AC solenoid pilot, the 42W59 provides the rapid response required for residential and light commercial Lennox heat pump units.

Veteran technicians recognize this reversing valve for its brass construction and a maximum operating pressure rating of 300 PSI, making it a reliable HVAC replacement part for systems demanding 50/60 Hz frequency compatibility. When diagnosing a stuck reversing valve or a failing 24V solenoid, the Lennox 42W59 serves as the direct OEM equivalent to restore factory-spec heating and cooling performance without the fitment issues common in generic after-market alternatives.

• Precise Refrigerant Control: Expertly directs the rejection or absorption of heat by switching suction and discharge gas paths.
• Durable Brass Housing: Built to withstand high-vibration environments and refrigeration system thermal cycling.
• OEM Compatibility: Guaranteed fit for Lennox HVAC equipment requiring a 1/2 x 7/8 ODF 24v reversing valve.
• Universal Application: Rated for both residential and light commercial 24-volt control circuits.

Is the 24V solenoid coil included with the 42W59?
Yes, the Lennox 42W59 typically includes the 24V AC solenoid, though technicians should always verify the existing harness and coil voltage during installation.

What causes a Lennox reversing valve to fail?
Most heat pump reversing valve failures stem from solenoid coil burnout, physical debris within the slide mechanism, or "stuck" conditions caused by system contamination or oil sludge.

Can I use the 42W59 with R-410A refrigerant?
This 4-way switching valve is designed for modern high-pressure R-410A environments as well as older R-22 systems, provided the ODF connection sizes match the original specifications.

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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.