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 my numerous successful results  with Spirotherm VDT series air and dirt separators enhance the entire system. http://www.spirotherm.com/products/combination-air-dirt

In my experience I have found that they are the most 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.

For example, this strategy works very well at Saint Michael’s College in VT because the HVAC facilities team leaders Al Sutton and Corey Marceau have  had their expectations exceeded on every install throughout their campus.  The same goes for the  hundreds of buildings where Spirotherm combo units  have solved system issues for building owners that have been putting up with air/dirt issues for years.

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


Question:  I have been considering installing one of the new magnet separators that my wholesaler salesman has been leaving brochures on. 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 ill 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

My sound advice would be to continue installing the Spirotherm VDT’s simply because they remove more air and dirt better than any separator on the market. This proven fact is why the hundreds of experienced Facility Managers that I work with will not install any knock-off device or allow any one of those dreaded “value added” tangential separators that I often refer to as “big paperweights” to replace the Spirotherm VDT’s in their buildings.

Sorry about the rant, but I hate seeing building owners wasting their money on silver or bronze level products when the gold is MUST LESS expensive long-term. This bad decision of going to an alternative is usually made by someone who never had the opportunity to be taught about the physics of air/dirt elimination.

This one bad mistake will have negative effects on all of the systems equipment for decades while the retired bean counter is on a beach sipping fruity girly drinks with umbrellas while the HVAC crew back at the facility is dealing with clogged sensors, leaking pump seals, blocked control valves, entrained air noise, BTU transfer loss and the list continues.  

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 black 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%.  It’s just basic physics, no smoke and mirrors.  Thank you Bill Reid and David Urell for permanently etching this into my brain. I will get you both back for this someday.

Standing next to “Big Blue” is the infamous ( aka “Mr. NECERAPPA”) Richard Wolbach, the Facilities Energy Engineer at the University of Vermont. And no, he did not plan to wear his blue golf shirt that day to match the impressive insulation job. Like most things in life, it just happened that way.

Now you can toss that glossy magnet brochure in the trash for everyone’s own good. Let me know you have any questions. We can discuss this discuss this subject all day or you can check out the Spirotherm 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, log on to http://www.Spirotherm.com.