Reznor 196949 Limit Switch

The Reznor 196949 Limit Switch is a critical safety component designed specifically for commercial and industrial heating units. As a Manual Reset (M/R) Limit Switch, this part is calibrated to open the electrical circuit when internal plenum temperatures reach 225 degrees Fahrenheit, preventing hazardous overheating and protecting the heat exchanger from thermal stress. Engineered by Nortek for the Reznor brand, this OEM replacement part is a standard requirement for maintaining the operational integrity of gas-fired unit heaters.

For field technicians, the 196949 flame rollout switch serves as a definitive fail-safe. Unlike automatic switches, the manual reset functionality ensures that a qualified contractor must inspect the unit to identify the root cause of the high-limit trip before the heater can be placed back into service. This switch features a red dot indicator for quick identification and is precision-manufactured for high-demand HVACR environments. Relying on genuine Reznor 196949 components ensures seamless compatibility and maintains the factory-specified safety parameters of the equipment.

Heater Compatibility: This limit switch is designed for use with Reznor UDAP, UDAS, UDX, and UDZ series heaters, specifically covering 45, 60, and 75 BTU models, and extending up to 400 series units depending on the specific assembly configuration.

• Precise Thermal Protection: Opens at exactly 225F to prevent equipment damage during flame rollout or airflow failure.
• Manual Reset Security: Forces a manual system audit after a fault, preventing unsafe automatic cycling of the burner.
• Direct OEM Fit: Ensures exact electrical ratings and mounting alignment for Reznor furnace repair.
• Industrial Strength: Built to withstand the high-cycle demands of commercial unit heaters.

• How do I reset the Reznor 196949 switch? Disconnect power, remove the heater access panel, and press the center reset button firmly until a "click" is felt. Always verify airflow and gas pressure before restarting.
• Can I bypass this switch for testing? No. This is a safety device. Bypassing a 225F limit switch can lead to heat exchanger failure or fire hazards.
• What causes this limit switch to trip? Common causes include a blocked flue, failed blower motor, dirty air filters, or cracked heat exchangers.

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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.