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Downfiring oversized boiler??
First of all thanks to all the experts that have helped me over the years. The information in this site is invaluable. To the task at hand. I've expereinced some intermittant short cycling and started to investigate. We have a 3,000 sq ft home across four floors including the basement. I started to calculate the the total EDR because I always thought the boiler was quite large for the space. Its a Pemco with 225,000 BTUs output. My EDR calculations came in around 140,00 BTUs. I installed a vaporstat and the boiler runs at less the 1psi. One of our HVAC contractors suggested that I downfire the boiler but I wanted thoughts from this formum before going down that road. I know that could create other problems. The system is properly vented with Gorton #2 on the two mains and Gortons on the rads everywhere else.