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Weil Mclain Ultra 3 Lockouts
Thanks for the reply. You're explanation gives me a better idea of how the primary through the tees is supposed to work, however....isn't it possible that under a certain condition you could "interfere" with that flow from boiler suuply to return with excessive flow / head through the heating zones? If that condition could exist...then I may be looking at that as well since it seems like too much of the residual hot water in the boiler (upon a call for heat)gets sent up the heating zone right away. In otherwords, in my case, the boiler return gets almost as cold as the return water from the heating loop initially, which would indicate the the boiler is returning almost none of it's supply water to itself.
Attached are some pictures....You will have to follow the pipes closely to see that they are correct, as they loop around. It was originally piped slightly different with the side port of the tee as the physical connection between supply / return. Weil Mclain Tech Support suggested that I pipe the tees exacly as in the diagram (he was 99% sure it would solve my problem....good thing he left himself 1%) so I repiped it with the same resulting nuisance lockout.