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Replacing steam boiler on system w motorized valves
I was asked to help size a replacement Boiler for a large home in Fairfield county. The boiler is a twenty plus old Smith 19 series Boiler that is very over sized for the home. The attached load is 753 EDR. There is a Boiler Return trap which I cannot identify. The only markings are an S and the number 2143H . It has a top tapping that is tied into boiler supply and a lower tapping that dumps into return side of the boiler. There are 3 motorized valves on the run outs to the 3 areas of the house. They are close to the boiler and the valves connections sizes are 1-1/4 “ ( reduced from 2” with bushings ) . The owner says the system has worked well but now the boiler is leaking . I also noticed that these valves are not dripped at all. My approach is to right size the boiler, add a boiler feed pump , drip the valves into the return and eliminate the return trap.
The owner doesn’t want to switch to hot water , which I suggested . The contractor wants to simply put in a boiler of similar size and leave everything else as is . I am looking for some expert advice.