Xylem-McDonnell & Miller 25A-HD Head Mechanism For 25-A 127100

The Xylem-McDonnell & Miller 25A-HD Head Mech. 25A 127100 is a replacement part for pressure control switches found in HVAC systems. It manages system pressure by opening and closing an electrical circuit as the pressure reaches a predetermined level. The head assembly consists of a spring, a diaphragm, and an adjustable screw to set the required pressure. This item is specifically developed for Xylem-McDonnell & Miller 25A series pressure control switches and can help with issues such as switch malfunctioning, erratic operation, and failure to respond to pressure changes. The 25A-HD head mechanism has several advantages, including ease of installation, restoration of appropriate switch functions, and increased system reliability.