Lennox 42W94 Transformer

When you are troubleshooting a 460V commercial unit and your secondary control circuit is dead, the Lennox 42W94 Transformer is the industry-standard OEM replacement part you need to restore 24V power. This heavy-duty 70VA transformer (also rated at 75VA in newer Class 2 revisions) is engineered to step down 460V-480V primary high voltage to a stable 24V output, powering critical components like contactors, relays, and integrated furnace control boards. Designed as a direct HVAC replacement part for Lennox rooftop units, air handlers, and heat pumps, the 42W94 features a rugged construction that handles the thermal demands of high-duty cycle industrial applications. As a veteran technician, you know that using a genuine Lennox OEM part ensures the mounting footprint and wire leads match the original LB-74930 specifications, eliminating the need for field modifications and reducing your time on the roof. This Class 2 transformer provides the necessary current-limiting safety features required for modern HVACR control circuits.

• Direct OEM Compatibility: Specifically designed to replace Lennox part numbers 42W94 and LB-74930, ensuring a perfect physical fit and proper electrical lead length.
• Integrated Circuit Protection: Includes a factory-installed 3.5 Amp circuit breaker on the secondary side to protect sensitive 24V boards from overcurrent or shorts.
• High-Capacity Power: The 70VA / 75VA rating provides ample wattage for multi-stage systems and high-current contactors without voltage drop.
• Industrial Build Quality: Built to withstand the extreme temperatures and vibration common in heavy-duty commercial HVACR cabinets.

• Will this transformer work with 480V input? Yes, the 42W94 is rated for 460V/480V primary applications, making it suitable for standard three-phase commercial service.
• Does this include the internal circuit breaker? Yes, this specific OEM model features an integrated breaker to prevent downstream component damage.
• Can I use this on non-Lennox equipment? While designed for Lennox systems, it can function as a universal 460:24V step-down transformer provided the 70VA rating meets the load requirements and mounting clearance is available.

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.