Description
The Lennox 16W74 SPST Limit Control L190-40F is a temperature-activated safety switch used to monitor and manage heat conditions inside heating equipment in HVAC systems. Installed in compatible furnaces and air handling units, it responds to rising internal temperatures by opening or closing an electrical circuit to regulate operating conditions within the burner or heat exchanger area. The component is mounted within the furnace assembly, where it works alongside control boards, blowers, and ignition equipment during system operation. It is commonly used in residential and light commercial equipment.
