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Switch from copper fin to cast iron radiators
My house originally had steam radiators. I know this as the old steam pipes were still in the basement and the rad foot prints are still in the oak floors with 1 hole to the basement. Someone ripped them out and replaced with a hot water, copper finned baseboard system. This BB covers a lot of nice wood in the house.
Since I'm not a fan of BB heat and have always had radiators, I am ripping out the copper and installing CI rads.
I did the math and arrived at the size needed for each room. Pricewise the rads are pretty expensive in restored condition. I was able to find 1 restored for a very low price from some going-out-of business house boneyard in Massachusetts. I got it home and air pressure tested for 24 hours. No leaks. But I needed 5 more.
I just found and purchased 2, covered in some type of exterior grade oil paint. Quite the mess. So I disassembled them using a sledge and wood wedge. Came apart rather easily. 20 sections each. Short (20 inches) and thin. I'm removing the push nipples and taking the 40 sections to a local guy for sandblasting. Hoping to reuse all the nipples. Should I apply any sealant to them before re-installation?
Once painted, what's the best way to re-assemble? I hesitate to simply insert the rods and start to tighten the nuts as I feel the tabs could snap. I did see a U-Tube vid where a large press was utilized. Well, I don't have one available.
I was thinking about cutting 4 lengths of 2x4 and drilling holes to match the rod holes in the rads. Then inserting long threaded rods and pressing one section at a time with the nuts and big washers while using the wood as buffers against the cast. Once together, re-insert the original rods. Sound ok? Is there a standard foot pound measurement used with a torque wrench?
I currently have 1 copper loop in the basement feeding 80 feet of copper BB. Should I install 2 loops of copper and feed 3 of the rads from each loop? I read 60 feet is max and darn if the last room on the loop never gets warm. The kitchen. I end up running my oven on low, with the door closed, quite a bit.
I did purchase those diverter valves (cant remember what they are called) to sweat to the copper feed diverting part of the feed water to a rad rather than simply running a continuous loop into and out of the radiators. Is that clear?
Another question, do I install 2 shut off valves to each radiator? I assume the reason is to be able to isolate the rad for repairs?
But, what if my calcs are off and I have 1 room getting too warm due to an oversized radiator. Do I remove a section of the rad or use the incoming valve to throttle down the amount of hot water entering the rad?
Thanks for any advise in advance.