Description
The Lennox 10M74 is a factory-specified insertion-style limit switch engineered to protect furnace heat exchangers and air handling components from damaging overtemperature conditions. With a 155°F cutout (open) setpoint and a 125°F cut-in (close) setpoint, this limit switch automatically interrupts the burner circuit when supply-air temperatures exceed safe operating thresholds, then resets once temperatures return to normal operating range.
Key Features
- 155°F cutout (open) temperature for reliable overheat protection
- 125°F cut-in (close) temperature for automatic reset operation
- Insertion-style design for direct mounting into the furnace plenum or heat exchanger section
- OEM Lennox replacement part — direct fit for compatible Lennox furnace models
- Helps prevent heat exchanger damage, nuisance shutdowns, and unsafe operating conditions
Application
The Lennox 10M74 insertion limit switch is a direct OEM replacement designed for use in Lennox forced-air furnaces. It mounts into the supply-air plenum or duct section and monitors air temperature to safeguard the heat exchanger and blower assembly. When the sensed temperature reaches 155°F, the switch opens to shut down the burner; it automatically resets at 125°F, restoring normal operation without manual intervention.
Why Choose an OEM Lennox Limit Switch?
- Ensures precise calibration matched to Lennox furnace design specifications
- Maintains system warranty compliance and code conformance
- Provides dependable, long-service-life overheat protection
- Simple drop-in replacement minimizes installation time
Reviews
There are no reviews yet.