The safety circuit is separate from the operational circuit

Key Benefits for the Contractor Flexible Output: Operates as a 2-speed unit

This 120V ignition module provides a fixed 5-second pre-purge to clear the combustion chamber and a 4-second trial for ignition (TFI) to ensure safe burner startup

this specific model is designed for a 24V control circuit

The junction box and terminal block design are specific to Williams wall furnaces that utilize a safety circuit loop

Lennox 38M67 Limit Switch 322055-301 The safety circuit is separateThe Lennox 38M67 Limit Switch is a critical safety component designed for precise thermal regulation within Lennox residential furnaces and HVAC systems. This L190 30F furnace limit switch operates as a primary safety control, featuring a fixed temperature setting of 190F for the high limit cutout and a 30F differential for the automatic reset. Built to handle 24V or 120V ignition systems, this SPST (Single Pole Single Throw) configuration ensures the