Lennox 57W76 - (R37520B018) Thermal Rollout Switch, Purple ID Color, Actuates at 185°F ±13°F, Manual Reset, 90° Quick Connect Terminals
The Lennox 57W76 (R37520B018) Thermal Rollout Switch is a critical safety device engineered to detect excessive temperatures in and around the burner compartment of a gas furnace. This switch is designed to interrupt power to the burner in the event of flame rollout or other abnormal heating conditions, helping to prevent potential damage to equipment and reduce fire risk.
Key Features:
- Precise Temperature Activation: The switch actuates at 185°F with a tolerance of ±13°F, ensuring timely interruption of the system when temperatures exceed safe operating limits.
- Manual Reset Mechanism: Unlike automatic reset switches, this component features a manual reset, which ensures that the issue is thoroughly inspected and corrected before the system is restarted, adding an extra layer of operational safety.
- 90-Degree Quick Connect Terminals: Comes equipped with angled terminals that simplify wiring in tight spaces and reduce strain on connections, allowing for easier installation and maintenance.
- Color-Coded Identification: The purple ID color helps technicians quickly identify the correct component during servicing, improving accuracy and efficiency.
- Durable OEM Construction: Manufactured to original equipment specifications, this switch ensures compatibility and long-term performance in Lennox systems.
Applications:
This thermal rollout switch is commonly found in:
- Residential and commercial Lennox gas furnaces
- OEM and aftermarket HVAC maintenance
- Flame rollout protection systems
It acts as a line-of-defense safety mechanism, immediately responding to hazardous conditions caused by obstructed flue passages, cracked heat exchangers, or improper combustion. Once tripped, it cuts power to prevent further operation until a technician resets it and corrects the underlying issue.
Technical Specifications:
- Actuation Temperature: 185°F (±13°F)
- Electrical Connection: 90° quick connect terminals
- Reset Type: Manual reset
- ID Color: Purple
- Part Number: R37520B018
- Lennox Catalog Number: 57W76
Installation Note:
Installation should be carried out by a qualified HVAC technician. Always ensure the system is powered down before replacement. This switch is intended for use in systems specifically requiring a 185°F manual reset rollout switch with 90° terminals.
Trust Lennox OEM parts like the 57W76 to maintain safety, reliability, and performance in your heating system. Ideal for routine maintenance, repairs, or part replacement, it helps ensure your furnace operates within safe thermal limits throughout the heating season.
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