Johnson Controls R120AAA-701 Repair Relay Pack

The Johnson Controls R120AAA-701 Repair Relay Pack is a critical field-service component engineered specifically for addressing relay failure within S500 Series Electronic Fan Speed Controllers. This replacement kit allows technicians to restore functionality to AC fan speed control systems without requiring a full controller swap, maintaining precise condenser pressure regulation and head pressure control in HVACR applications. Designed for seamless integration, the R120AAA-701 features high-grade electrical contacts capable of handling the inductive loads characteristic of PSC motors and single-phase condenser fan motors. Its plug-and-play architecture ensures rapid installation within the existing control housing, minimizing system downtime. By utilizing this OEM replacement part, contractors can ensure their Johnson Controls S500 series repair meets original factory specifications for electrical switching and logic sequencing. This relay pack is the standard solution for resolving intermittent fan operation or total loss of speed modulation in critical cooling systems.

• Precision Compatibility: Designed exclusively for the Johnson Controls S500 series, ensuring exact physical fit and electrical synchronization.
• Cost-Effective Maintenance: Enables component-level repairs of the fan speed controller, avoiding the expense of replacing the entire electronic module.
• Enhanced Durability: Built with industrial-grade materials to withstand the high-cycle demands of HVAC head pressure control.
• Streamlined Installation: Simplifies the relay replacement process with dedicated leads and mounting points optimized for HVACR cabinets.

What are the signs that an S500 series controller needs this relay pack?
Failure is typically identified by a condenser fan failing to start, staying on at full speed regardless of pressure, or rapid "chattering" of the relay contacts during low ambient cooling cycles.

Does this kit include installation instructions?
Yes, the R120AAA-701 is supplied with the necessary wiring diagrams to ensure proper termination within the S500 fan speed control housing.

Can this relay be used with non-Johnson Controls controllers?
No, this represents a specific repair kit tailored for the internal circuitry of the S500 series and is not intended for universal application.

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.