rookie primary secondary question

DanHolohan

is to limit as much as possible the pressure drop in the common piping (that shared by the primary and secondary circuits) so it's best to have nothing between those two tees that leave the primary to go to the secondary.

Jake Timmerman

I know that in a primary secondary setup you should have your secondary tees around 4 times their diameter apart from each other off your primary circuit, but can you have another secondary circuit inbetween your tees? so it would be circuit 1 supply,circuit 2 supply,circuit 1 return,circuit 2 return. instead of cir 1 supply, cir 1 return, cir 2 supply, cir 2 return. would it make a difference if it was a one pipe or two pipe primary?

Murph'_4

wouldn't the second and third circuit

be receiving diluted temperatures? how would you compensate and which ones would be picked to be #1 #2 etc, just a thought??!


Murph'

DanHolohan

That always happens

in one-pipe pri/sec systems. You can get around it by using supply and return manifolds to the secondary circuits off a single supply/return hook-up to the primary circuit.

hot_rod

Maybe this will help

I have taken the branches off opposite sides of the pipe, but never mixed the order as you questioned. What would be the advantage of that?

This article will clear up some of your questions,and if you are calculatorly inclined you can determine the temperature drop between the various tee take offs.

Highlight this link and paste it into you browser, click enter.

hot rod

P/S happy hydronicizing

http://www.pmmag.com/CDA/ArticleInformation/features/BNP__Features__Item/0,2379,11743,00.html

Murph'_4

that looks like

how i did mine about ten years ago, manifold off of P/S and a secondary circuit

Murph'_4

that looks like

how i did mine about ten years ago, manifold off of P/S and a secondary circuit for radiant floor through a mixing valve (although later i questioned the manifold)mainly for the indirect and soon to be added BB and a few panels. i will post some pics after i clean-up a bit in the boiler room!! (G)Of course low bid caused a slight roof leak and my "me and Dan in the basement" certificate got wiped out, wonder if there are any re-prodctions available??



Murph'

Michael B

people always accuse

me of trying to sell stuff...guilty. We have been having really nice success with this product from Caleffi. (Check out the link). Siggy wrote and article about closely spaced tees in a box a few months back and we are all over it.

http://www.caleffi.com/en/index2.php?go=home.php

Michael Bleier
Able Distributors

Jake Timmerman

Say you used a manifold setup on the secondary circut to supply an indirect water heater and a number of baseboards. when the circulator for the indirect turned on would that cause heat to migrate into the baseboards? Would all the takeoffs on the manifold have to have zone valves even if they each had there own circulator?

Mark J Strawcutter

flow control

not zone valves, but rather flow control valves - and preferably on both supply and return for each "zone".

Mark

Mark Eatherton1

DOUBLE BONUS!!

10 points for 2 new words to our hydronic lexicons. Hydronicizing and Calculatorly. Nice job HR:-)

However... I think I'd spell the calculator word with an i behind the r. Calculatorily (cow-Q-LA-toreally)

No points for word modifications ;-).

ME

Big Ed

Link

hot rod ,
I'am having problems with your link ...sigh.....Is it correct.

hot_rod

Ed, the link

works at my end! Or go to www.pmmag.com. Click on the archive window in the yellow bar. Scroll down to Oct. 2000. Click on Siggys column.

Better yet buy this CD and get all the column 100 plus 350 color pages of text and diagrams.

Aaaaaand a hydronics 101 course to boot. Get 'em from the PM website.

hot rod