Description
Lennox 22B75 Limit Control — OEM Replacement Part
The Lennox 22B75 (part number 102857-28) is an OEM replacement limit control designed to protect Lennox furnaces from overheating conditions. With a 200°F limit setpoint, this control monitors heat exchanger temperatures and interrupts the burner circuit when unsafe temperature thresholds are reached, safeguarding both the equipment and the occupants it serves.
How It Works
The limit control acts as a critical safety device within the furnace system. When the supply air temperature exceeds the 200°F threshold — due to restricted airflow, a dirty filter, or other system faults — the control opens the circuit to shut down the burner. Once temperatures return to a safe range, the control resets to restore normal operation.
Key Features
- OEM Lennox replacement part — part number 102857-28
- 200°F limit setpoint for precise overheat protection
- Designed for direct replacement in compatible Lennox furnace models
- Helps prevent heat exchanger damage and fire hazards
- Reliable bimetal or disc-type sensing technology
- Easy installation for qualified HVAC technicians
Application
This limit control is intended for use in compatible Lennox gas furnaces as a direct OEM replacement. Always verify compatibility with the specific furnace model before installation. Replacement should be performed by a licensed HVAC technician in accordance with local codes and manufacturer guidelines.
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