Key Benefits 5

preventing compressor slugging or efficiency losses during the defrost cycle

facilitating the essential time delay relay function that prevents cold air discharge and protects the heat exchanger from thermal stress

making it a versatile stock item for service technicians

preventing unwanted overfilling

Hoffman Specialty 401485 Water Vent 320074-702 Key Benefits 5The Hoffman Specialty 401485, or Model 78 Water Main Vent Valve, is a high capacity automatic air vent designed for efficient air elimination in hydronic heating and cooling systems. Engineered for closed loop hydronic systems, this vent features a 3 4" NPT connection and is built to withstand a maximum pressure of 150 PSI. Its primary function is to purge air from water mains and large distribution lines, preventing air bound system issues that lead