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the internal bimetal disc is likely fatigued or damaged
the SPDT contact action allows it to be wired for open-on-rise applications
or Tempstar unit
000 operating hours or once the discharge pH drops below 6
White-Rodgers 11D18-1 Control Els PW 17895 the internal bimetal disc isThe White Rodgers 11D18 1 Control is a rugged, well immersion hydronic control designed for precise temperature regulation in hot water heating systems. Engineered for high reliability performance, this immersion hot water control functions as a high limit, reverse action, or SPDT switching unit. It features a broad operating temperature range of 100F to 240F (Open High) and an adjustable differential of 5F to 45F, allowing technicians to fine tune
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