Description
Lennox 18J37 Auto Limit Switch Overview
The Lennox 18J37 is an OEM auto-reset limit switch engineered to protect furnaces and heating equipment from dangerous overheating conditions. With a trip range of 175–205°F, this limit switch automatically interrupts the burner circuit when supply-air temperatures exceed the set point, then resets automatically once temperatures return to a safe operating level — providing continuous, reliable overheat protection without manual intervention.
Key Features
- Auto-reset operation — restores normal function once temperatures drop to a safe level
- Trip temperature range: 175–205°F
- Direct OEM replacement for compatible Lennox furnaces and heating systems
- Interrupts burner circuit on high-temperature fault to prevent heat exchanger damage
- Durable construction for long service life in demanding HVAC environments
Application
The 18J37 limit switch is a direct replacement part for select Lennox furnaces and heating appliances. It is designed to monitor supply-air or heat exchanger temperatures and cut power to the burner if an unsafe high-temperature condition is detected, safeguarding both the equipment and the occupants of the building.
Specifications
- SKU / Part Number: 18J37
- Brand: Lennox
- Type: Auto-Reset Limit Switch
- Temperature Range: 175–205°F
- Reset Type: Automatic (AUTO)
Why Choose the Lennox 18J37?
Using a genuine OEM-equivalent limit switch ensures proper calibration and a reliable fit for your Lennox equipment. Substituting off-spec components can lead to nuisance trips, premature equipment failure, or — worse — undetected overheating. The 18J37 is the correct, trusted solution for maintaining safe furnace operation.
Reviews
There are no reviews yet.