Aaon P91340 Limit Switch

The Aaon P91340 Limit Switch is a mission-critical safety component designed for precise thermal regulation within high-performance HVAC systems. This 190-220F auto limit switch features a 7-1/8 inch insertion depth, ensuring accurate sensing of heat exchanger or supply air temperatures. Engineered for Aaon rooftop units and air handlers, the P91340 functions as an automatic reset safety device that opens the electrical circuit when temperatures exceed the 220°F threshold, protecting the blower motor and heat exchanger from catastrophic failure. Its robust construction and high-grade OEM thermal sensor design provide reliable cycling and long-term durability in demanding commercial environments. When diagnosing HVAC limit switch tripping or identifying an Aaon replacement high limit, verifying the insertion length and temperature range is essential for maintained system performance and code compliance. This part ensures the burner or heating elements cycles off before reaching unsafe operating conditions.

Key Benefits

• Extended Insertion Depth: The 7-1/8" insertion probe allows for deep-seated temperature monitoring in large-scale ductwork and heat exchangers.
• Automatic Reset Functionality: Automatically restores the circuit once temperatures drop below the 190°F differential, reducing unnecessary service calls for manual reset limit switches.
• OEM Compatibility: Precision-engineered for Aaon P91340 specifications, ensuring terminal alignment and mounting hole synchronization for fast field replacement.
• High-Temperature Threshold: Rated for a 220°F cutout, making it ideal for primary high-limit protection in gas-fired and electric heating sections.

Common Questions

How do I test if my Aaon P91340 limit switch is faulty?
Technicians should perform a continuity test across the terminals when the system is cool; if the circuit is open at room temperature, the switch has failed and requires replacement.

What causes a 190-220F auto limit switch to trip repeatedly?
Frequent tripping usually indicates restricted airflow due to clogged filters, a failing blower motor, or an oversized furnace, forcing the switch to protect the heat exchanger from overheating.

Can I replace a 7-1/8" insertion switch with a shorter probe?
No. The insertion depth is critical for ensuring the sensor is positioned in the direct path of the air stream; using a shorter probe may result in delayed response times and unsafe operating temperatures.

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.