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Versatile Refrigerant Compatibility: Supports R22
and BYC100G packaged units
20" WC for accurate low-pressure detection and system safety
making it the industry standard for direct-fired make-up air unit applications
The assembly features a robust 5/8"-24 UNEF tank connection and utilizes a 1/4"-20 female thread for secure probe attachment to the electrode fitting
McDonnell & Miller 309200 Switch 30067439-890 Versatile Refrigerant Compatibility: Supports R22The McDonnell & Miller 309200 is an industrial grade 11 MV Millivolt Switch specifically engineered for low water cut off (LWCO) control in steam boiler applications. This millivolt replacement switch is the standard for technicians servicing McDonnell & Miller Series 61, 64, 67, 69, 70, 764, and 767 units. Featuring a Two SPST Auto Reset configuration, the 11 MV provides dual circuit control, allowing contractors to manage both the burner circuit and
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