Interesting system

Unknown

I came across an interesting system today. First time I have ever seen this done.

A monoflow system that another company had replaced the boiler a few years back. When they did, they put a zone valve on the supply Tee for each radiator in order to allow the customer to have multiple zones. There is a Taco 007 on the supply AND the return.

I have been trying to do the math to figure out if the return circulator is helping or hindering the job, and so far I am leaning toward slightly hindering.

Here is a sketch of the system:
http://www.newcastleadornments.com/sketch.JPG

Both circulators are powered at the same time.

What do you think?

- Norm

bob young

???

Whether it works or not is one thing ,it looks good on paper but that is one hell of a beautiful sketch !!

Wayco Wayne_2

The second circ

may have been put in to create more pressure drop across the monoflo tees. But the circ leaving the expansion tank is the one in the right location. The other one could be trouble. They just should have put one larger circ leaving the expansion tank. Cool idea zoning off the monoflo tees. I have done the same with TRV's on raidators. WW

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

gerry gill

does it work okay?

does the design work well?

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Ron Schroeder

I would worry about heat loss on the loop. I am getting 20 K Btu/hr worst case. q=h*T*pi*d*L=4*(180-60)*3.14*0.083*160=20K. The slow flow with one circulator may not matter if this loss in the basement is reduced.

Uni R

Hrmmm...

It would be nicer if they had a smart circulator that can pump harder as the circuits close off. When all the monoflo circuit are open it only needs the single 007, but as the branch circuits start shutting down, so does the overall flow which is why they did this. I really like monoflo systems, but in this case, they really should have just piped it parallel reverse.

soot_seeker_2

Sketch

Robert O'Connor_12

Interesting (nt)

Jed_2

Or

1/2" 3-way valves on the branch supplies.

Unknown

The customer has been happy. I think for my own morbid curiosity I may see if I can visit this home at a few different times in a year and see how it runs.

I'm thinking that the second circulator cant really help any to pull water through the loop when most of the valves are closed any better than a single circ can since the distance between the two circulators are so minimal.

Would it be any different if one circ was at the supply, then the second halfway around the loop?

Thanks for all your input.

- Norm

JOHN_103

i like the three way valve idea.we used it years ago never had problems that i know of