water circulation

larry_34

new at this i have a 6 loop radiant slab built in 1950 with half inch copper tubing i cant get the water to move through my longest loop which is app 280 ft i have tryed a grundfos 2696 4375 taco 007 b&g pl55 ican get water through there with the garden hose so i know the loops not pluged i have pumped away from the tank and into the tank with little difference it almost seems like the pumps are not getting what they need to do what they do any help this is a 7 year endeaver please any one feel like calling also 440 886 2452 iam desperate

Alan(OnVacationInOregon)Forbes

Could it be

an air problem?

[Deleted User]

Sounds familiar...

If I'm not mistaken, you tried contacting me this morning.

Some questions.

What are the approximate lengths of the other circuits on the same manifold?

Can you close off all but the questionable circuit via balance valves?

When it is running do you get ANY flow through that circuit?

Is this a Levitt style home?

Got pictures of the manifold and near boiler piping?

What pressure are you running at?

Got schematic?

ME

Weezbo

if you have a small picture...

Mark, can figure a way to Make it work:)

my first idea is, have you tried to remodel it at about the same time as it quit working?

if so, there in may lie the solution to your Problem....especially if a Big Screwdriver or Wrench was in any way involved..crowbars are also likely candidates for suspect error readings...