Description
Lennox 38M69 SPST Limit Switch Overview
The Lennox 38M69 is an OEM replacement SPST (Single-Pole, Single-Throw) high-limit switch engineered to protect furnaces and heating systems from dangerous overtemperature conditions. With a cutout temperature of 240°F and a cut-in (reset) temperature of 210°F, this limit switch reliably interrupts the burner circuit when supply-air temperatures exceed safe operating thresholds, then automatically resets once temperatures return to the normal operating range.
Key Specifications
- SKU / Part Number: 38M69
- Brand: Lennox
- Switch Type: SPST (Single-Pole, Single-Throw)
- Cutout Temperature: 240°F
- Cut-In (Reset) Temperature: 210°F
- Application: Furnace high-limit / overheat protection
- OEM Lennox replacement part
Features & Benefits
- Automatic reset design restores normal furnace operation once temperatures drop to the cut-in setpoint
- SPST configuration provides a simple, reliable open/close circuit for burner control
- Precise temperature differential (30°F) between cutout and cut-in ensures stable, chatter-free switching
- Direct OEM replacement ensures proper fit and function in compatible Lennox heating equipment
- Helps prevent heat exchanger damage, fire hazards, and nuisance shutdowns caused by overheating
Application
The Lennox 38M69 limit switch is designed for use in Lennox furnaces and compatible heating systems requiring high-limit overheat protection. Always verify compatibility with your specific model before installation. Consult the equipment service manual for correct mounting location, wiring, and torque specifications.
