Critique this diagram please.

Weezbo

*~/:)

Hydronicad ...? how well did you read that article?

john coulson

25 gpm in 1\"

25 gpm through 1" pipe ??? must be noisy

Unknown

Nope, 12.5 gpm through 140' of 1" HePEX times two runs so TOTAL = 25 gpm.

Glenn Sossin_2

Article

Actually skimmed through it - was looking at the piping diagrams and noticed the tag line stating "Schematic of a parallel primary loop used in systems where the same fluid temperature must be supplied to each secondary circuit."

I've attended several of John's classes and seminars and always found them to be educational. Last one was in the Radiant Precision course in NJ last summer.

Do plan to read it when I get a couple of minutes free, its in my laptop case close by.

S Ebels

OK

I'm a little slow but I do catch on eventually. The picture I'm drawing in my head is that you have two units, piped with 1" pex, which dump into a "primary loop", which is 1 1/2"? Correct so far? That loop is what handles the total 25GPM flow?

Then from that primary, your zones run out to their destination?

S Ebels

Glenn

That's just a "stock" drawing I have in my documents. I have a couple dozen basic drawings taht I've accumulated which are used for reference when laying out jobs. I don't think it's entirely applicable to MDF's application but I posted it just to try and better understand what he's trying to do.

The drawing was done with Siggy's Hydronicad software. It works pretty well for a guy with average computer skills like myself.

Unknown

Correct, I'm pretty much on to where I screwed up, which kinda ticks me off because it WAS submitted to Wirsbo rep and Robur rep before I ever touched the first piece of pipe. They both approved it. I figured I was golden. Hah! Overall it works, mainly because the off cycle loop absorbs the excess velocites so the secondaries make it flow slightly, maybe 1-2 psi difference beteen in and out of the units so it's not much. I view it as desirable because it keeps the offline unit (outside) water circuit at operating temp. I have become aware of the hydronic separator here. It is the answer to his type of install although I lose my residual flow through the offline unit. Wish I'd though to post the project here when I was designing it. I coulda saved a little heartache.

Thanks for posting!

Steve Ebels_3

Maybe you mentioned this somewhere........

Do those heat pumps (not familiar with the brand) require constant flow or does the associated circ run only when there's a call for heat?