I was sold a normally open zone valve with the sale of a used econoburn. Previous owner said it was wired to the over-temp factory leads and I think he had it wrong, using that valve as a "dump zone". Does the Econoburn need not only a normally open valve for a loss of power dump zone but also a normally closed valve for use in an over-temp situation? I finally powered up the the econoburn for the first time and checked voltage across the terminal block and I was not getting 24v from the over-temp relay. Under the assumption from the previous owner, I thought the over-temp continiously provided 24v to the valve to keep it closed and during an over-temp/power failure, it cut the power and the valve opened.