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2 Degree Differential
this manual reset limit switch or automatic cycling control (depending on specific heater configuration) acts as a primary furnace high limit sensor
these parts are technically identical and can be used interchangeably in any Lennox application requiring a 120V to 24V step-down
but if the ceramic is scorched or cracked
McDonnell & Miller 309000 Resistor Kit 30067439-890 2 Degree DifferentialThe McDonnell & Miller 309000 Resistor Kit, specifically the Model 7B 1R, is a critical slide wire resistor assembly engineered for proportional signal control in industrial boiler systems. This 135 ohm resistor kit is designed to interface directly with 7B switches, providing the necessary modulating signal for precise burner control and water level management. As a veteran grade replacement part, it is compatible with the Series 93, Series 193,
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