Aaon P85450 Limit Switch

The Aaon P85450 Limit Switch is a critical safety component designed for high-performance HVAC equipment, specifically engineered for Aaon rooftop units and air handlers. This L240-30F limit switch functions as a primary thermal protection device, featuring a fixed temperature setpoint that opens the electrical circuit at 240°F and automatically resets when the temperature drops by 30°F. Built for industrial-grade reliability, this manual reset limit switch or automatic reset thermal disc ensures system integrity by preventing heat exchanger overheating or blower motor failure during high-limit excursions. When performing HVAC furnace limit switch replacement, the P85450 provides the precise electrical ratings and mounting footprint required for seamless integration into existing control circuits. Its robust construction resists vibration and thermal cycling, making it a dependable OEM Aaon replacement part for contractors maintaining commercial climate control systems.

• Precision Thermal Monitoring: Accurate 240°F trip point ensures reliable over-temperature protection.
• OEM Compatibility: Direct replacement for Aaon P85450, maintaining original factory specifications.
• Rapid System Integration: Standardized mounting and terminal configuration for quick field installation.
• Industrial Durability: Engineered to withstand the harsh environments found in commercial RTUs.

What causes this limit switch to trip frequently?
Repeated tripping usually indicates restricted airflow, such as a clogged filter, undersized ductwork, or a failing blower motor assembly.

Is the P85450 an automatic or manual reset switch?
The L240-30F designation typically refers to an automatic reset switch that re-closes the circuit once the sensed temperature drops 30°F below the trip point.

Can I bypass this switch for diagnostic purposes?
Never bypass a safety limit switch during normal operation. Bypassing should only be done briefly by a qualified technician to confirm a component failure.

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.