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Here are a few pictures of the valves and circ pump

Good evening, I am attaching a rough sketch of my system. The only thing I am not 100% certain of is if there are 4 sets of radiators in series. It is possible that there is a parallel branch so that the downstairs radiators (D) can operate normally even if the upstairs radiator (U) is...

Sure thing - I will take pictures and post them when I get home (should be by tomorrow evening). To answer a few of your questions, there are 2 zone valves and only one circ pump. The two loops join back together upstream of the circ pump, which is just about 2 feet before the return piping...

My house was built in 1930 - I'm not sure how old the boiler system is, but based on my research trying to get some questions answered, I think it must be quite old since I don't have all the bells and whistles in the equipment on my system. I have a New Yorker Boiler, model FR. It looks like...