Anyone tell me why my wirsbo tubes (oxygen barrier tubes) chug and knock? They seem to chug where they go in, and come out of the cement floor, and knock at the Heat Link manifold. The cement floor in question is a one and a half inch pour suspended on the second floor. The manifold where the knocking occurs is located below, on the main floor. To my way of thinking, the first likable suspect is air in the tubes above, since air rises, and there is no way for air to escape if it travels to the second floor, since the air snifter valve is directly installed on the manifold below. But, stangely, I do continue to get circulation, and warm floors. I poured the floor, and included rigid insulation around the outside edges for a thermal break from the outside walls. But I did pour the cement directly up against the bottom plates of the interior walls. The plumber that finished hooking up the electric boiler, manifolds, etc. told me the knocking was from expansion of the cement floor. He explained, since it was poured against hard edges, it has no place to expand outwards, and therefore knocking results. He suggested either chipping away at those edges of the cement floor where they come in contact with the bottom plates, or gouging away a little at the bottom plates themselves to make a small gap to allow for expansion when the floor heats up. But, before I take on this task, I still wonder if there's air somehow still trapped in the tubes above on that floor. Maybe he's right, and I'm wrong. What do you think? Thanks in advance, John
- posted
19 years ago