Rheem-Ruud AP16640 L180F Lower Limit Thermostat Switch

The Rheem-Ruud AP16640 is an L180F lower limit thermostat designed as a critical safety component for Rheem and Ruud gas furnaces and heating systems. This bimetal snap disc temperature control automatically monitors heat exchanger temperature to prevent overheating and equipment damage.

Key Features:

• Cut-out temperature: 180°F (82°C) for overheat protection
• Cut-in temperature: 160°F (71°C) with automatic reset
• 20°F temperature differential for reliable operation
• Open-on-rise switch action cuts power when temperature exceeds setpoint
• 1/4 inch quick disconnect terminals for easy installation
• Electrical rating: 10A @ 120V AC, 5A @ 240V AC
• Can handle loads up to 25 amps at 240VAC

This lower limit switch serves as a safety device that automatically shuts down the heating system when excessive temperatures are detected. The automatic reset design allows the furnace to resume normal operation once temperatures return to safe levels. Essential for maintaining safe operation of Rheem-Ruud furnaces and protecting the heat exchanger from thermal damage.