Description
The Lennox 20J98 is a precision-engineered fan limit control designed for use in Lennox furnaces and compatible forced-air heating systems. This OEM replacement control provides reliable dual-function protection by managing both the circulating fan operation and the high-limit safety cutoff — two critical functions that keep your heating system running safely and efficiently.
How It Works
The fan limit control monitors heat exchanger temperature through its 7-inch insertion probe. When the supply air temperature rises to the cut-in setpoint, the control energizes the blower to begin circulating warm air. If temperatures reach an unsafe level, the limit function shuts down the burner to prevent overheating and potential heat exchanger damage.
Key Specifications
- OEM Part Number: 20J98
- Brand: Lennox
- Fan Cut-In Temperature: 210°F
- Fan Cut-Out Temperature: 180°F
- Insertion Length: 7 inches
- Function: Combined fan control and high-limit safety switch
Features & Benefits
- Genuine Lennox OEM replacement part for assured fit and performance
- Dual-function design controls both fan operation and high-limit protection in a single unit
- 7″ insertion probe ensures accurate sensing of heat exchanger temperatures
- 210°F cut-in setpoint delays fan start until air is comfortably warm, preventing cold air drafts
- 180°F cut-out setpoint ensures the blower continues to run until residual heat is extracted
- Helps protect the heat exchanger from thermal stress caused by overheating
- Direct OEM replacement minimizes installation time and callbacks
Application
The Lennox 20J98 fan limit control is intended for use in Lennox forced-air gas furnaces as a direct OEM replacement. Always verify compatibility with your specific furnace model before installation. Installation should be performed by a qualified HVAC technician in accordance with local codes and the equipment manufacturer’s instructions.
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