White-Rodgers 90-T40F1 Transformer

The White-Rodgers 90-T40F1 is a core component for any technician’s truck, serving as a reliable 40VA Class 2 transformer for residential and light commercial service calls. This unit provides a precise 120V to 24V step-down, making it the industry-standard direct replacement for Y65A13-0. When you are troubleshooting a control circuit that isn't pulling in contactors or powering the board, this foot mount transformer offers the physical and electrical compatibility needed to get the system back online without modifying the mounting bracket. The secondary side features heavy-duty screw terminals for secure low-voltage connections, while the primary side utilizes standard leads for integration into the high-voltage junction box. Engineered to handle the inductive loads of gas valves and relays, this HVAC control transformer ensures stable voltage across the 24V rail even during peak demand, preventing the nuisance trips and chatter often seen with undersized or generic power supplies.

• Direct replacement for Y65A13-0 ensures a drop-in fit with no cabinet drilling required.
• 40VA rating provides sufficient overhead for modern digital thermostats and multiple stage contactors.
• Foot mount configuration allows for versatile installation inside furnace blowers or air handler control sections.
• Inherent current limiting meets Class 2 requirements to protect downstream low-voltage components.

Can I use the 90-T40F1 to replace a 30VA transformer?
Yes, upgrading from a 30VA to a 40VA unit is a common field practice to provide more "headroom" for the control circuit, provided the secondary voltage remains at 24V.

How do I identify the primary vs. secondary wires?
The primary 120V side uses wire leads, typically black and white, while the secondary 24V side features the two screw terminals for easy thermostat wire landing.

Is this unit rated for continuous duty in HVAC systems?
This is a standard duty transformer designed specifically for the continuous power requirements of HVACR control systems and 24V accessories.

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.