Johnson Controls Y45AA-9 Manual Potentiometer 1000Ohm Open-Close

The Johnson Controls Y45AA-9 Manual Potentiometer is a 1000 Ohm control device intended to be used in HVAC systems. It is a way of changing a system by hand, often with the use of a knob or a dial. This is done by turning the dial which changes the resistance (in this case 1000 Ohms) and sends signal to the HVAC equipment. This signal can be used to control functions such as damper position (open-close) in air handling units or variable speed control of pumps and fans. Due to the fact that it is manually controlled, the Y45AA-9 provides a practical and dependable method of bypassing automatic functions or making changes in real time.