VSI question

Wayco Wayne

Radiator loop and baseboard loop are constant circulation. I think as long as I have a flo check in line it sould work with no problems. Let me know if my vision is short sighted.

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Wayco Wayne

Is there

any problem with using VSI in systems that are not Primary secondary? I am looking at an existing Buderus with 2 zones of constant circ each with it's own circ and flo control, and each parallel to each other. If i put an injection loop next to these and use a circ with flo check, injecting into a secondary radiant floor loop (with it's own circulator for the floor), what could be the harm?

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hr

You need to

make sure you have flow past the tees where you connect the VSI pump to the boiler loop to get a constant supply of high temperature water. At least I think that is what you are asking. Draw a picture for us to be sure.

hot rod

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Wayco Wayne

Egads!

How do you make the picture smaller????

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hydronicsmike

Wayne...

...you may want to double check on this, but as far as my knowledge goes, I don't think the Buderus Boiler requires a certain flow rate through its heat exchanger, due to its mass. If thats the case, you can do what you are proposing. However, keep in mind that you may have potential for reverse flow if you don't use check valves.

hope this helps.

Mike

Eric

caution

You now have 3 pumps in parallel all pumps are fighting to pull water through the boiler.

If a zone pump calls for heat at the same time as your VSI pump is operating. You may dead head the VSI pump at low rpm.

hydronicsmike

well, if I am not missing anything,

I would expect the injection pump to ramp up at this point, if it wouldn't get enough flow (or heat) from the boiler. Therefore I can not see a problem with what he is doing.

Mike