plugged circuit loops

service1

no circulation thru 2 circuits of radiant in slab heat.  No success with a purge, couldn't get any flow.  Isolated boiler and put air to it and was still unable to push thru.  No heaves in concrete.  Any ideas how to find obstruction or kink in line?  I was kind of thinking tracer wire locate but didn't know if that could push thru all the turns and it could be out there 100 ft.  Has anyone had success without breaking out too much concrete?

Appreciate your help.

furnacefigher15

circuit flip flop ?

Could the circuits be crisscrossed some how, or is the piping disconnected on both ends?

service1

plugged circuits

I'm pushing thru the supply and coming back out the return manifold.  Only the return has valves for purging purposes.  So the supply side is all open.  these circuits aren't affected by other zones since the supply that I'm pushing thru is not isolated from the other zones, so if it was on another zone I would still be pushing thru the pump to these circuits.

billtwocase

try

to blew that circuit out in the reverse. In other words, disconnect feed and returns, and blow from return side. I have seen stuff lodge itself at a kink, but won't continue on thru a loop. Worth a shot. Good luck

kcopp

the reverse trick....

might work. did you try plain air? What type of tubing are we talking about?

Mark Eatherton

I think you misunderstood Bills question/recommendation...

If you had one plugged circuit, I'd say it was a fluke. Having 2 plugged circuits indicates that both ends of the tube circuit are connected to the same manifold. i.e. supply or return.



QUestions: DId it EVER work correctly?



Who's tubing?



Oxygen barrier tubing?



What ferrous components in the system?



Have you pulled the circuits off of the manifold and attempted to blow through them while disconnected?



The only tubes' Ive seen plug were non barrier tubes on a system loaded with ferrous components. They were also small diameter (3/8") tubes.



ME

furnacefigher15

My thinking is

Disconnect from the manifold entirely, and blow through each line and see where it comes out, or if it does at all.



Could be a problem with the manifold. The most restrictive point is at the manifold connection (takes the 1/2 ID tube and makes it more like 3/8 at the barb fitting, or compression fitting))