Lennox 42J32 Transformer

The Lennox 42J32 Transformer (also identified as Lennox 42J3201) is an OEM Class 2 control transformer designed for precise voltage regulation within Lennox HVAC systems. This heavy-duty 120V to 24V transformer features a 40VA power rating, providing the consistent current necessary to drive integrated control boards, electronic gas valves, and low-voltage thermostats. Built for direct service replacement in ML180, ML193, and ML195 series furnaces, it utilizes a standard foot mount configuration for stable installation within the blower compartment or control cabinet. This specific HVAC 24V step-down transformer is engineered for 60Hz primary circuits and includes lead wires for secure connection. By strictly maintaining a secondary 24VAC output, it prevents the low-voltage control malfunctions often caused by erratic power delivery or mismatched aftermarket components. Whether you are addressing a blown furnace transformer or performing a preventative control circuit upgrade, this genuine Lennox part ensures industrial-grade reliability and exact mechanical compatibility with original equipment specifications.

• OEM Compatibility: Specifically designed as an exact drop-in for the Lennox 42J3201, ensuring zero-clearance issues in original cabinets.
• Optimized Power Output: The 40VA rating provides a sufficient power buffer for modern multi-stage control boards and smart thermostats.
• Direct Foot Mount: Simplified installation with foot mount brackets that align with factory-drilled holes in Lennox air handlers and furnaces.
• Core Protection: Engineered as a Class 2 transformer to limit power delivery and enhance the safety of the low-voltage control loop.

Is the 42J32 compatible with the 42J3201?
Yes, these part numbers are technically identical and serve as direct replacements for one another in all Lennox terminal and control applications.

What should I check if my transformer keeps failing?
Repeated failure usually indicates a short in the 24V circuit, often at the contactor coil or the thermostat wire. Always verify the amp draw on the secondary side before finishing the call.

Does this unit include a fuse?
This version is typically provided with an inline fuse or is designed to integrate with the fused protection on the Lennox furnace control board to protect the secondary windings from overcurrent.

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.