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Each control is self powered and requires no electrical connections. Each unit is made of a sensor, set point dial, and valve actuator. These three components may be contained in one unit, or connected by capillary tubes. Set point dials show guide marks (1-5) and provide positive shutoff when turned fully Clockwise (control with remote sensor is mounted on the valve body with the sensor mounted beneath the heating coils in the cold air return, or on a nearby wall. Capillary length is 6'8". Range 43-83f (6-28c).