The Series 750B product line fromMcDonnell & Miller(Chicago) is designed to provide control of pumps, motor starters, and electric valves for commercial/industrial steam and hot water boilers. Available in a variety of configurations, the Series 750B provides point-actuated level control, low water cut-off, pump on- pump off, or high-level alarm. Two models are available - 24 vac and 120 vac with automatic or manual reset capabilities.