Controler questions

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mtnmizer

New Member
Hearth Supporter
Jun 19, 2008
129
W MT
I'm trying to get my mind around the details of the boiler
install. Got a couple of unresolved items that I hope the
more knowledgeable on the board could shed some light on.
I apologize for the simplistic questions..

My present heating system is a primary/secondary propane
boiler hydronic system. 3 zones of baseboard , 1 of radiant infloor.

If I understand the way to procede, is to hook the output on the
wood boiler (econoburn 150) above the secondary row of tees and hook
the wood boiler return to the output line on the gas boiler.

To add storage I make a new zone. So far so good.

I want the wood boiler to service primary demand when called for.
My plumber (has done a few of these installs, most recent a year
or so ago a Tarm60) says the boiler on full burn will have output
above the baseboard demand and will need to shunt hot water to the
storage zone. OK-- what tells the storage pump to do this? What hardware
how to install ect? An aquastat somewhere in the primary system hooked to
some sort of Circpump control?


My plumber tell me to find him a schematic, the
factory was not helpfull in answering my questions today...So
I'm kinda on my own..for now.

It's my hope to feed the infloor radiant off the stored hot water.
How can I get a circulation loop between the stored hot water and
the radiant circ pump?

It seem like I'm missing something here between the basic understanding
of how this works and some sort of interface control. Is there any
product that will be able to tell these different devices when and how
to function?

The supplied manual is woefully inadquate IMO.
Any help appreciated.. MM
 
mtnmizer said:
The supplied manual is woefully inadquate IMO.

The instructions are vague so that folks who read them and can't figure it out will ask for help from others. Seems to work :)

The STSS piping scheme is often used... (broken link removed to http://www.stsscoinc.com/Products_SolarAndWood.aspx)

Just note that the Econoburn uses a bypass pump instead of a Termovar, so the near-boiler piping is slightly different.

Joe
 
The STSS scheme is nice in that it provides a path through the storage in the event that all of the zone valves are closed. I have no direct experience with it, but I'm curious about how it would work in a primary / secondary configuration.

It has no temperature sensor or other controls to modulate the percentage of flow that goes through the storage - as far as I can tell, the weighted check valves provide a bit of back pressure so that flow will go through the zone valves if any are open. It's a simple and elegant solution, but I don't think it addresses your problem directly.
 
Thanks for the STSS links, I sent that schematic to my plumber along
with Nofossils non pressurized diagram. Not sure what a weighted
flowcheck is or why it is needed.

It looks like STSS's ECM is an off the shelf controler that will work.
Is there any other type/brand available.?

MM
 
mtnmizer said:
Not sure what a weighted flowcheck is or why it is needed.

It's a one-way valve, using a flapper that is weighted to stay closed. The weight is slight, so it prevents unwanted flow ("ghost flow," resulting from a distant pump or from thermal convection), but does not much impede flow when you actually want it to happen.

Joe
 
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