System 2000 and Variable Speed Circulators

GreenGene

Hello all

I was wondering if anyone has had any experience in changing out a 007 on a standard System 2000 EK1 with a Taco Viridian or Grundfos Alpha and how you set them up and what you thought.

SWEI

How is the system piped? Are there zone valves?

GreenGene

I'm an instructor/ contractor, but I do have one with 4 zones plus an indirect using a zv.

I'm just curious how the EK1 reacted to the change in flow as zv's open and close or just 1 is open, etc because the EK1 heats up pretty quick.

Robert O'Brien

Shouldn't be a problem with a DP pump, I wouldn't use a DT pump, the flat plate is going to have high DT vs heating zones.

GreenGene

Thanks Robert, personally I don't use the heat exchanger, I use a 1" zv and a superstor indirect, I think the plate can work great with city water but with well I go indirect.

I was wondering with the 1/2" bypass if say a small zone opened the pump would back off, this would slow flow through the bypass and block as well causing it to heat quickly, this could have a positive effect where the block wouldn't drop on the first cycle and shut off the circ while it regenerated, but it could also cause the block to hit high limit, I haven't seen one yet set up so I wanted to see if anyone has any positive or negative experiences.

I'll try to contact someone at the factory as well.

Robert O'Brien

It's going to maintain a constant pressure, so it will react to the changes in restriction as valves open and close.

GreenGene

Thanks, the factory said the same, DP.

GreenGene

For DT now it depends, all 4 zones are different for load 15k - 40k, DT if memory serves runs in the 16-20 range.

Hypothetical question, still using the 007 and haven't seen a variable pump on a EK1 yet, I was wondering what people have seen and tried, what worked, etc.

GreenGene

Good point though, my SS has the 1" cupro-nickel coil and would need full flow and I am 1" all the way to and back.

GreenGene

I hear ya.

Robert O'Brien

If you are just after the electrical savings you can run the pump on a constant speed and use 1/2 the wattage as a standard pump. Taco is coming out with a ECM 007 very shortly.

GreenGene

Thanks