Resideo R8239A1052 Control Center

The Resideo R8239A1052 Control Center is a field-proven solution for providing low-voltage control of line-voltage fan motors in both heating and cooling applications. Engineered for reliability, this fan center integrates a NEMA Type D 40VA transformer with a high-performance R8222B SPDT relay, allowing you to interface a 24Vac thermostat circuit with 120Vac equipment seamlessly. This unit is specifically rated for 3/4 HP motors and auxiliary circuits, making it a standard choice for technicians upgrading or repairing residential HVAC systems. Designed for efficient installation, it mounts directly to a standard 4x4 inch junction box, and its color-coded lead wires simplify the wire-up process for single or two-speed fan configurations.

Built to handle rigorous electrical loads, the R8239A1052 features internal overload protection for the transformer and a field-replaceable relay, ensuring the system remains serviceable without disturbing the primary wiring. With an SPDT switching action and contact ratings of 12 Amps at 120Vac, it provides stable performance for blower management. The enclosed relay design allows for indoor mounting in any orientation, offering the versatility required on a busy job site. Whether you are troubleshooting a multi-stage system or installing a new fan control, this 40VA fan center provides the necessary voltage isolation and switching power for long-term system integrity.

• Integrated 40VA Transformer: Provides reliable 24Vac secondary power with a 120Vac primary input, featuring NEMA Type D construction.
• High Power Capacity: Rated for motors up to 3/4 HP with a 12 Amp full load rating at 120Vac.
• Field Serviceable: The R8222B relay is easily replaced without removing the transformer or main base from the junction box.
• Universal Mounting: Fits standard 4" x 4" electrical boxes and can be installed in any indoor location without additional enclosures.
• Broad Compatibility: Supports single or two-speed fans and auxiliary circuits in total comfort heating-cooling systems.

Can I use the R8239A1052 to replace an older Honeywell fan center?
Yes, this is the direct current-production equivalent for most older 120V SPDT Honeywell fan centers. Always verify that your motor's amperage and horsepower do not exceed the 12A/3/4 HP limits.

Does this unit support two-speed fans?
This model is designed for single or two-speed fan control. For two-speed applications, ensure the wiring follows the specific high/low speed terminal configurations for your specific blower motor.

What happens if the relay fails?
The relay is a plug-in R8222B module. You can replace the relay component specifically, which reduces downtime and labor costs during service calls.

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.