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Posted by dtkopp on October 20, 2004 at 19:58:54:
In Reply to: Re: hydronic infloor system problems posted by Harold hydronicnetwork.net on February 02, 2004 at 08:49:39:
: Overheating would be if the water reached 210F as the T&P (temperature and pressure water heater relief would) let go at that temperature; it would let go at 125 psig also. The problem is most likely that the expansion tank is waterlogged or too small. Your system only needs to be pressurized to 10 psig, so it is probably overfilled. the hand valve that feeds it might be leaking by to overpressurize the system. It would be prudent to have a 30 psig relief valve on the system to prevent such high pressures. It is not being used for domestic hot water so it should never reach pressures over 25 psig.