White-Rodgers 90-290Q Relay

The White-Rodgers 90-290Q Relay is a heavy-duty, 24V single-pole normally open (SPNO) switching solution designed for high-reliability in HVACR control circuits. As a veteran-preferred fan relay, this unit features a Type 84 enclosed design, making it an ideal choice for managing single or two-speed fan motors, solenoids, and resistive loads. With a contact rating of 8 Amps inductive and 16 Amps resistive at 125/250 VAC, the 90-290Q provides dependable low-voltage control for oil furnace upgrades and high-performance cooling systems. Its compact frame and 1/4-inch quick-connect terminals simplify field installation in tight cabinets, while the quiet electromagnetic coil ensures minimal noise during operation in residential or commercial environments.

Key Benefits:

• Universal 24V AC/DC coil allows for versatile integration with modern smart thermostats and vintage equipment alike.
• Robust SPNO contact configuration (Normally Open) ensures a reliable circuit path for secondary fan motors or humidifiers.
• Fully enclosed Type 84 housing protects internal components from dust and debris, extending the service life of the air handler.
• High temperature-rated operation from -40°F to 150°F ensures stability in demanding plenum environments.
• Compatible with Nest, Ecobee, and Honeywell systems when creating a C-wire path or isolating transformer loads.

Common Questions:

Can I use the 90-290Q to add a C-wire for a smart thermostat?
Yes. Technicians frequently use this relay alongside a standalone 24V transformer to provide the necessary common wire for modern thermostats on legacy 2-wire setups. It effectively isolates the 24V control signal from the heating circuit.

What are the coil resistance specs?
The coil features a 90 Ohm DC resistance with a nominal current draw of 125 mA. This satisfies standard VA requirements for most HVAC control transformers without causing voltage drop issues.

Is this a direct replacement for older RBM Type 84 relays?
The 90-290Q is the standard industry replacement for most SPNO Type 84 enclosed relays. Always verify the terminal footprint and contact ratings before completing the swap.

This item is not eligible for free shipping.

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.