There was a man who worked at Bell & Gossett named Gil Carlson who was known as the “Father of Modern Hydronics”. He invented products and developed various theories and applications that today we consider standard procedures. One of his most popular and probably most important discoveries was the “Point of No Pressure Change.” This subject deals with the importance of proper pump location in a closed hydronic system.
(and how to apply it to today’s heating systems) part 1
Primary/Secondary pumping…It seems to have become the “catch-phrase” of the hydronics industry over the last few years and rightly so. Its applications are virtually endless and the benefits of this piping technique have solved many problems over the years. But where did this piping technique come from and WHY is it so useful?
Over the past decade or so, the hydronic heating industry has been using controls known as “stand alone” type controls. These controls were intended to control a specific application or purpose. These applications would include resetting a single boiler with & without DHW, control the firing & staging of a multiple boiler system, control a mixing device for a radiant system and even a control for the snow melt system.