Radiant heat supply

Ed Kreuz

Ed Kreuz

Supply lines

I have a house with 11 zones of radiant heat. The supply runs in a loop and there are runs off of that supply with circulator pumps, and taco mixing control valves, the return dumps back into the supply right before the next zone take off which give each zone down the line less temp. Is this correct or should the returns enter the line after all the zones ? If someone could help me I would appreciate it, i have pictures if that would help. Thank you Ed

Jim Eastman_2

Radiant supply

A picture or piping diagram would help!

kevin coppinger_4

pictures are...

always helpful...it sounds like primary secondary piping which is correct piping to protect the boiler...kpc

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[Deleted User]

That's one way to do it...

However, the flow through the primary loop had be REAL fast to keep the water temps up, or the loads should have been designed such that the subsequent down stream load is sized for lower water temperatures, or it could be a problem at design conditions.

Knowing what I know about most heating contractors, the system is priobably grossly oversized in all categories, so in reality, it may work fine. Key word MAY...

A picture tells a thousand stories...

ME

Ed Kreuz

radiant supply picture

Ed Kreuz

Ed Kreuz

Donny

nice work

my opinion, it will work fine if adjusted properly

singh

Not correct.
Your return IS too close to the supply for the next zones!
They should be about 8 pipe diameters away from each other.
Your supply and return tees should be no more than 4 pipe dia. from
each other in the same zone. Hard to tell but they look ok, but could be closer.
In addition you primary pump (black pump) should have been piped after
expansion tank .
If you re-pipe,try to consolidate some of those pumps, you most likely don't need that many, you could zone similar temperatures with telestats or zone valves. I'm also not a big fan of manual type mixing devices, not easy to get precise temperature control,try variable speed mixing pumps , or motorized mixing valves,these devices have sensors on the supply pipes and reset temperatures based on that , plus outdoor reset.

jerry scharf_3

There's a lot of work there

As ME said, that's one way to do it. The question becomes is working right? If not, what exactly is not working as needed?

I agree that the return from the one zone is too close to the takeoff for the next. There is little space for the water to mix. On the other hand, the returns are piped 90 degrees from the supplies, and so laminar flow would help prevent the supply water from being just what came back from the prior return.

It's not how I would do it, it uses a lot of electricity and the temp control is not the best. It also degrades in a way that could cause complaints (last room gets cold rather than all rooms drop a bit.) But there is a whole lot of time and expense in that setup and I sure wouldn't pull it all out on general principles. If it's performing badly, get someone who really understands piping and see what they can do to fix the system.

just my $.02

jerry

Jed_2

And what about boiler return temps?

> my opinion, it will work fine if adjusted

> properly

Jed_2

And what about boiler return temps?

Is there any protection for that oil fired boiler for return water temps?

jed

Ed Kreuz

radiant heat supply

Is there any protection for that oil fired boiler for return water temps?
the answer to this is i do not know. it has a taco pc700-2 boiler reset control. It also does not work well in my opinion. Could i just move the returns to the lower return pipe ? what problem is going to be caused by the primary pump before the air seperator? It does has that storage tank beside the boiler. I belive i have fairly good stuffed just not totally right. Any suggestion for a person to look at it in central Pa ?

Ed Kreuz

Is there any protection for that oil fired boiler for return water temps? the answer to this is I do not know. it has a taco pc700-2 boiler reset control. THE system also does not work well in my opinion. Could I just move the returns to the lower return pipe ? What problem is going to be caused by the primary pump before the expansion tank ? It does has that storage tank beside the boiler. I belive I have fairly good stuff just not totally right. Any suggestion for a person to look at it in central Pa ?