Johnson Controls A19ADB-38 SPST Remote Bulb Control, 100/240°F Manual Reset Thermostats ; 6" Capillary

The Johnson Controls A19ADB-38 SPST Remote Bulb Control is an efficient switch to control temperature in the HVAC system. It employs a liquid-filled sensor bulb that is connected by a 6” capillary tube to the main control unit. This SPST switch can then cut the power to your heating or cooling equipment so that your space doesn’t get too hot. The adjustable differential enables you to control the temperature range in the manner you desire. For example, if the control point is set to 70 with a 2 differential meaning the point at which the cooling system activates is 72 degrees and where it deactivates is 68 degrees.