Johnson Controls A70BA-18C Temperature Controller (120 to 600VAC, Stages: 1 Heat, 1 Cool)

These controls have a four-wire, two-circuit contact block that allows them to both regulate temperatures and perform a secondary function. The contact block contains two isolated sets of contacts, so when the main contact opens the auxiliary contact closes. These controls are commonly used to switch on an indicator light after a low-temperature cutout in ventilation systems. These controls have enclosures that meet NEMA 1 for use indoors. These controls are compatible with single-stage systems. Single-stage systems have a single output level and allow the system to be either on or off. These temperature controls have a capillary tube and sensor that monitor and regulate the temperature of the ambient air, a liquid, or a gas at a distance away from the control.