Lennox 73W19 Limit Switch 318172-701 and other standard DDC controllers

and other standard DDC controllers with selectable configuration switches

and 3B electrode fittings

Technicians must always disconnect or remove power from the E3Point base unit before removing the old cartridge and seating the new E3O2 sensor to prevent board damage

ensuring the coil surface is fully utilized without risking liquid carryover

Lennox 73W19 Limit Switch 318172-701 and other standard DDC controllersThe Lennox 73W19 is a critical 155 30V OEM replacement limit switch engineered for precision temperature monitoring in high efficiency furnace applications. As a direct replacement for Lennox 102857 06, this high limit safety control is designed to break the electrical circuit if the heat exchanger temperatures exceed the 155 degree Fahrenheit threshold. This Lennox furnace limit switch prevents thermal stress on the heat exchanger and ensures the