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

Common signs include intermittent flame rollout

This SPST (Single Pole Single Throw) switch is factory-calibrated to a set point of 1

preventing unwanted overfilling

Hoffman Specialty 401485 Water Vent 320074-702 facilitating the essential time delayThe 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