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discontinued spark-to-pilot ignition systems to a modern solid-state control module
this unit requires a double shaft motor to drive blowers on both sides of the motor housing
and LED compatible loads without minimum wattage requirements
specifically engineered for the 243-8 and 243-12 models with Internal Relief Valve (IRV) configurations
Williams P323664 Safety Switch 321894-708 discontinued spark-to-pilot ignition systems toThe Williams P323664 Safety Switch is a critical OEM replacement part designed for high limit temperature monitoring in Williams enclosed front vented room heaters. This vent safety switch is engineered to break the electrical circuit and shut down the burner if flue temperatures reach the 250F threshold, preventing hazardous downdrafts or obstruction related overheating. Featuring a manual reset mechanism, this SPST furnace limit control ensures the
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