Honeywell T991A1244 Proportional Temperature Controller 55°F-175°F 5' Capillary

A proportional temperature control device, such as the Honeywell T991A1244, is utilized in many HVAC systems to keep temperatures constant. It consists of a 5-foot capillary tube with a sensor at the end that is placed into equipment or environments that need temperature control. Upon detecting the ambient temperature, this sensor notifies the control unit. To obtain and maintain the appropriate temperature setting, the control unit then controls the flow of heating or cooling media, such as water or air. By minimizing pointless heating or cooling cycles, this exact control enhances overall system efficiency and helps eliminate unpleasant temperature variations. Boilers, duct heaters, hydronic heating systems, and other applications needing accurate temperature control frequently employ the Honeywell T991A1244.