Spirotherm Cut-Away

Although this informational website is only for Grundfos E-Solutions, I would not be doing my job if I did not share results  with Spirotherm VDT series air and dirt separators enhance the entire system. http://www.spirotherm.com/products/combination-air-dirt

I have found that air/dirt eliminators are a critical component for protecting the life cycle of the pumps and the entire system equipment overall. If air is trapped in a closed loop system, then BTU transfer is greatly reduced, oxidation starts to kick and valves, heat exchangers and piping get attacked by the liquid sandpaper made up of dirt, particulates and debris.

If your budget is tight, I recommend installing the Spirotherm VDT first, allowing it to  remove the entrained/entrapped/dissolved air (including in the coils) and dirt/magnetite throughout the system then upgrade the pumps in the next fiscal year.

Learn more about Spirotherm air and dirt eliminators at www.Spirotherm.com/


Question:  I have been considering installing one of the new magnet separators. What is the advantage of having the magnet type over the Spirotherm?

Answer:  The short answer is no advantage of switching to a magnet filter. It is a much lesser product than the Spirotherm. Don’t buy the hype.

My experience in facilities has shown that a Spirotherm VDT air and dirt eliminator will do everything that a magnet filter will do PLUS remove all of the non-ferrous particulates PLUS you do not have to service it to remove the contents.

Do you really want to have your HVAC staff maintain another piece of equipment when you can set the Spirotherm on an automatic purge with a small circulator and never worry about it again?

Spirotherm benefits


UVM Rich Wolbach
University of Vermont

Pictured to the left is “Big Blue,” a 12″ Spirotherm VDT air and dirt eliminator installation at the University of Vermont chiller plant. Soon after it was installed, the CHW campus loop changed from a dark sludge to a mostly clear water, and  eliminated any humidity issues as they  met their design temperature.

They increased their BTU transfer the by completely removing the stuck  micro-bubbles air from the coils. When this happens, we get to reduce the speed of the pump.

Remember the Pump Affinity Law? When slowing down  a pumps motor, the head is reduced by the square and HP used is reduced by the cube. For example, a 100 HP @ 50% speed reduction is now using only 12.5 HP. Even  a minimal reduction of speed will create large energy savings.  Just a small 10% reduction in speed reduces the HP by 27.5%. 

Below are third-party case study results provided by Dino Pioli, the Northeast Regional Manager from Spirotherm.

Spirotherm REsults

For additional technical support, submittals or information on their Quad VDT series, go to http://www.Spirotherm.com.