The Honeywell L4006A1967/U is an immersion-type Aquastat controller designed to regulate or limit the temperature of liquids in boilers, storage tanks, and other hydronic heating applications. It features a visible control point scale with an external adjustment screw for easy settings between 100°F and 240°F. The unit includes a 5°F to 30°F adjustable differential and a factory-set stop at 240°F. This SPST controller operates on temperature rise to setpoint and can be mounted in either a horizontal or vertical orientation

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