Air Management

An expansion tank connected on the discharge side of the pump caused the pump inlet pressure to drop below atmospheric, turning the air separator into an air intake. The fix was simple — move the tank connection to the pump inlet. The glycol everyone blamed was never the problem.

Of the essential components every modern hydronic system needs, the air separator is the one most often missing. Without one, automatic air vents won't work properly, and the result is noise, poor circulation, and poor heat transfer. High temperature, low pressure, and low water velocity are the keys to effective air separation.