mixed injection piping

shawn_5

on this system with injection piping on the supply where the point of injection is does it have to have the offset in piping.I am hooking into a existing boiler weil mclein with 2 baseboard zones looked at the wirsbo propanels and too much $decided to go with this with a tekmar 356 injection control.with 3 zones of radiant.any thoughts.

hr

A couple thoughts

I don't think I would pull the baseboard off as a parallel loop. Boiler return protection will be weird.

Here is one of many methods to accomplish you goal.

Pull the indirect off as a parallel loop, be sure to check valve protect both sides of the indirect. The Super Brute gives you one side protection. You should also have a the check on the boiler return. Then you may prioritize the DHW load.

Pull your "highest temperature required" zone off the primary loop next. The baseboard zone. Again check protect both S&R

Then the VS injection loop. Keep in mind on a small to medium load this could be 3/4" or even 1/2"! The math will size this piping.

I like to put the injection pump on the return. It sees the cooler return water this way. Not a huge deal, but why not.

In the injection cross over put a balance valve or a window type circuit setter to adjust the injection rate easily. Again check protection on both side.

A purge method at the secondary help speed up the purge process. Same with the baseboard loop. The primary and indirect will purge fine through the primary loop air eliminator.

Sure, all these connections to the primary loop could come off the top or side of the primary loop in any location that fits your application space. Crucial is to protect S&R, on ALL take off points, with checks to prevent ghost flows.

The HDS software would size all this nicely for you, including pipe sizes, pump sizes, injection loop size and flow setting gpm required, expansion tank, etc.

Sorry about the crude drawing

hot rod

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Ted_9

I dont know if this will work for you but the Taco RMB-1 looks like it would work well here. Keep the promary loop, and the closely spaced tees, connect the RMB-1. From there you can pipe the 3 circ with their manifold off the supply. The RMB-1 has a Tekmar in it.

PATRIOT HEATING & COOLING, INC.

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hydronicsmike

Can't see why the RMB would not work....

...but the "Offset" as he called it, is there to prevent thermal heat transfer without the pump running. Should have at least a foot of drop downwards. If you can make it more than one foot, it would be even better.

hope this helps.


Mike

Mark Chaffee

RMB

It looks like the Taco RMB would work nicely in this application, and it has boiler protection built into the control too. If you want to put a seperate boiler protection loop in, the easiest way to do it is by using a Taco 00-VS (variable speed setpoint) circulator. Just dial in the minimum boiler temperature and attach the supplied boiler return sensor. Whenever the return temperature falls close to the setting, the pump will come on and bypass hot water to protect the boiler. See attached technical article: http://www.taco-hvac.com/products.html?view=AllFileList&current_category=61&selected_infotype=1&min_num=14&c_sort_order=

- Mark Chaffee

shawn_5

Also I forgot to add it is a existing boiler all the pumps are pulling on the return with this be a issue with installing new pumps for the radiant on the return.thanks for all the input so far.

Tim Doran

Load

What is your rfh load? Why 3 pumps? It may have been possible to use zone valves or one manifold with actuators. Give me a call if you would like to discuss your application.

Tim D.

shawn_5

we are using the pumps 3 different zones I personally do not like zone valves.we had this laid out by our supplier using tekmar control.and this is what he has given me all temps are the same we are using wirsbo quicktrac.I did not know if it would be easier using telestat heads on a manifold.

shawn laverty

hey hot rod

hot rod what does that hds software stand for and were will get that thanks.

hr

Hydronic Design Software

try a demo at www.hydronicpros.com

It takes over where typical heat load software leaves off. It allows you to build all the hydronic componets on screen and play with various inputs. A "must have" program.

hot rod

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