Description
Lennox 74W75 Limit Switch — 225°F
The Lennox 74W75 is an OEM limit switch designed to protect your heating system from dangerous overtemperature conditions. With a trip point of 225°F, this switch monitors heat exchanger temperatures and automatically interrupts the burner circuit when temperatures exceed the safe operating threshold — preventing equipment damage, system failures, and potential safety hazards.
Why Limit Switches Matter
Limit switches are a critical safety component in gas and electric furnaces. When airflow is restricted — due to a dirty filter, blocked vent, or failed blower — heat can build up rapidly inside the heat exchanger. The limit switch acts as the last line of defense, shutting down the burner before temperatures reach dangerous levels. Replacing a faulty limit switch promptly restores proper safety control and keeps your system operating within manufacturer specifications.
Key Features
- 225°F trip temperature for precise overtemperature protection
- OEM Lennox replacement part — engineered for direct compatibility
- Designed to interrupt burner operation upon reaching the set-point temperature
- Helps prevent heat exchanger damage and system downtime
- Reliable performance in residential and light commercial Lennox furnace applications
Application
- Direct OEM replacement for compatible Lennox furnace models
- Suitable for gas furnace limit switch replacement
- Verify compatibility with your specific Lennox equipment model before installation
Installation Notes
Always disconnect power and gas supply before servicing. Consult the furnace manufacturer’s documentation and applicable local codes. Installation should be performed by a qualified HVAC technician.
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