Aaon P78190 Relay

The Aaon P78190 Overload Relay is a precision-engineered protection component designed for heavy-duty HVACR applications, specifically within Aaon rooftop units and air handlers. Operating within an adjustable amperage range of 6A to 8.5A, this relay provides essential motor overload protection by monitoring current pull and interrupting the circuit during thermal overloads or phase failures. As a direct HVAC OEM replacement part, the P78190 ensures accurate trip settings and seamless integration with existing contactor assemblies. Its robust construction is built to withstand the high-vibration environments of commercial cooling systems, preventing compressor motor burnout and extending the service life of expensive power components. For technicians performing HVAC system maintenance, this relay offers a reliable solution for maintaining optimal electrical safety parameters and system uptime. By utilizing this industrial control relay, you ensure that the motor operates within its designed thermal limits, avoiding nuisance trips while providing a critical failsafe against sustained overcurrent conditions.

• Adjustable Current Range: Features a 6-8.5A setting dial for precise overload relay calibration tailored to specific motor nameplate data.
• OEM Compatibility: Genuine Aaon replacement part ensures exact fitment and electrical specification matching for P-series equipment.
• Manual/Auto Reset: Provides flexibility in troubleshooting, allowing for manual intervention or automated system recovery after a thermal event.
• Enhanced Motor Longevity: Prevents stator winding damage caused by excessive heat, reducing the need for costly HVAC motor repairs.

Common Questions:

What causes an Aaon P78190 to trip frequently? Frequent tripping often indicates a mechanical bind in the motor, a loose electrical connection causing high resistance, or an incorrect thermal overload setting that does not match the motor's Full Load Amps (FLA).

Can I use a higher amperage relay if the 8.5A limit is reached? No. You must never oversize an overload relay; it must be sized according to the motor's FLA and service factor to prevent permanent hardware failure.

Is the P78190 compatible with non-Aaon equipment? While the electrical specs (6-8.5A) may match, this is a specific Aaon P78190 Relay designed for their proprietary control hardware. Always verify physical mounting compatibility before installation.

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.