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Field testing is performed by jumping the "Test" and "Test Common" terminals
Application Versatility: Ideal for natural gas and propane applications requiring high flow capacity and sensitive regulation
This 100 Series plug-in head utilizes a state-of-the-art optical sensing chamber and is engineered to provide stable detection in diverse environments
Operational Security: Includes adjustable dial stop pins to limit the temperature range
McDonnell & Miller 63-HD Head Mechanism R-410A Field testing is performed byThe McDonnell & Miller 63 HD Head Mechanism (Part Number 142600) is a heavy duty field replacement designed for Series 63 low water cut offs. As a veteran grade mechanical LWCO solution, this auto reset head assembly provides essential protection for both hot water and steam boilers in residential and commercial environments. Engineered to manage boiler pressure up to 50 PSI, the 142600 integrates the No. 2 SPDT switch to ensure reliable burner