Copeland Comfort Control (White Rodgers) 90-370 Fan Relay

The White Rodgers 90-370 Fan Relay is a heavy-duty, SPDT (Single Pole Double Throw) switching solution designed for high-demand HVACR applications. Operating on a 24V coil (50/60 Hz), this enclosed fan relay provides reliable control for fan motors, solenoids, and general-purpose switching in both heating and cooling systems. Technical specifications include a 77-ohm DC resistance coil and a contact rating of 12A continuous at 125 VAC (60A inrush). Its compact, totally enclosed design protects internal components from environmental debris, ensuring consistent performance in any mounting position.

As a direct replacement for 42-25104-06, the 90-370 is a critical HVAC replacement part for Rheem, Ruud, and various RBM-style Type 184 relays. The unit features 1/4-inch male quick-connect terminals for streamlined field installation. With a resistive rating of up to 25A at 277 VAC, it is engineered to handle the inductive loads typical of residential and light commercial air handlers and furnaces.

• Universal Compatibility: Serves as a 90-370 crossover for 42-25104-06, 90370Q, and numerous OEM fan control relays.
• Enhanced Durability: The totally enclosed relay housing prevents contact contamination in dusty furnace environments.
• Field Flexibility: Designed for multi-position mounting with semi-universal tabs to fit tight control voltage cabinets.
• Reliable Switching: Features SPDT contacts for versatile normally open (NO) and normally closed (NC) operational logic.
• Technical Precision: Low-power consumption 24VAC coil (3VA sealed, 4VA inrush) prevents overloading control transformers.

Is the 90-370 a direct substitute for the Rheem 42-25104-06?
Yes, the 90-370 is the industry-standard direct replacement for the 42-25104-06, featuring matching mounting footprints and electrical contact ratings.

What is the difference between SPDT and SPST in fan relays?
The SPDT fan relay provides a common terminal that switches between two distinct paths (NO and NC), whereas an SPST only offers a single on/off path. This makes the 90-370 more versatile for multi-speed fan control.

How do I wire the White Rodgers 90-370?
Typically, terminals 1 and 3 are for the 24V coil. Terminals 2, 4, and 5 represent the SPDT switch contacts. Always refer to the specific 90-370 wiring diagram printed on the relay casing or your equipment manufacturer’s schematic.

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.