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So a few days ago, my wife turned of the main shut off valve for the house in order to clean a sediment filter. After the job, she turned back on the main (very quickly she said) and it almost immediately cracked the supply HeatLink manifold of the hydronic system. She immediately turned of the water. When I got home, I replaced the broken section of the manifold (the heatlink manifold come in sections that are screwed together) and turned the main back on. Everything looked good - no leaks - and I left for 10 mins. When I went back down for one last check, I noticed the pressure was at 80 psi and climbing fast. Before I knew another piece of the return manifold cracked and water was spraying out like a fire hose. I should add I have a HeatLink system with 8 zones, actuators and bypass valve between supply and return. I am running this system off the same gas water heater as my domestic.
1) why is the PRV not going on the water heater?
2) If I shut off the supply manifold and turn everything on, my pressure still climbs
3) Expansion tank?
4) What is the relationship between this happening and the main getting turned on and off - trying to blame the wife.