Daikin-McQuay 113110801 Limit Switch

The Daikin-McQuay 113110801 Limit Switch is a critical auxiliary high limit safety control designed for precise thermal monitoring in HVAC air handling units and furnace systems. As a normally closed thermal switch, this component acts as a primary fail-safe, interrupting the electrical circuit to the heating element or gas valve if internal plenum temperatures exceed factory-set safety thresholds. Built for industrial-grade reliability, the 113110801 ensures system over-temperature protection, preventing heat exchanger damage and potential fire hazards. This genuine OEM replacement part features a high-sensitivity bimetal disc for rapid response times and is engineered to withstand the high-cycle demands of commercial rooftop units. When diagnosing HVAC limit switch tripping, technicians should verify airflow across the coil, as this switch is the definitive defense against restricted ductwork or blower motor failure. Integrating this Daikin-McQuay furnace sensor maintains the equipment’s UL certification and operational integrity in demanding mechanical environments.

• Precision Thermal Calibration: Engineered for accurate high-limit cutout to prevent equipment overheating and ensure long-term heat exchanger integrity.
• Direct OEM Compatibility: Eliminates mounting issues and electrical mismatches common with universal furnace limit switches by matching exact factory specifications.
• Enhanced Equipment Safety: Provides essential auxiliary high limit protection, serving as a redundant safety layer for commercial gas-fired and electric heating systems.
• Durable Construction: Heavy-duty housing and terminals are designed to resist vibration and thermal fatigue in high-output HVACR applications.

What causes a limit switch like the 113110801 to trip repeatedly?
Frequent tripping is usually indicative of restricted airflow, often caused by a dirty HVAC air filter, a failing blower motor, or undersized ductwork causing heat buildup in the plenum.

Can this auxiliary switch be bypassed for testing?
While a technician may momentarily jump the switch to diagnose a failed circuit, it must never be permanently bypassed. This HVAC safety sensor is critical for preventing catastrophic system failure.

How do I verify if the 113110801 limit switch is faulty?
Using a multimeter, check for continuity across the terminals while the system is cool. If the switch remains open at room temperature, the bimetal disc has likely failed or the internal contacts are pitted, requiring a replacement.

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.