Boiler controllers

Boiler controllers feature two mercury-free snap-action switches: one to operate a boiler feed pump and a second to interrupt the burner circuit in a low-water condition. Devices are designed for installations with operating pressure below 50 psi or for applications requiring wider differentials at lower pressures. Also available are models with quick hook-up fittings or gauge glass tappings. (McDonnell & Miller) Circle 11

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