T991B1003/U
Modulating Temperature Reset Controller
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70 F To 140 F Set Point Temperature Range, Copper Bulb Sensor Element, 1/2 in. Diameter x 4 in. Long Bulb Size, One 135 ohm Potentiometer, 1 To 1 Reset Ratio.
Features
10 ft. Indoor 30 ft. Outdoor Capillary Length
Automatic Outdoor Reset Controllers For Air Or Liquid
Raises Heating Medium Control Point Automatically As Outdoor Temperature Falls