I walked into a small nighmare. I went on a service call to deal with some noise issues with radiant floor heat. I have a Burnham Reliant boiler that maintains 160* at the boiler. The loop piping is not decoupled. What appears to be happening is when one of the zones kick in that have not been operating for some time, I am experiencing a temperature drop of about 35*. This is causing the noise because the boiler is getting a rapid temperature drop and tries to maintain 160*. After it maintains the 160* it sends the hot water back to the radiant zones and causes the temperature at the zone to jump up about 35* before the mixing valve can react. This is causing the noise.
Is the loop from the boiler supposed to be decoupled? Does anyone have a link they can share that will show me the proper piping and devices that are required to tame this beast?