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Steam radiators only partly heating - help !
My contractor recently installed three Governale Free cast iron radiators and only one of them consistently heats up all the way. Two of them are the same size (12 coils) and the third one is significantly bigger (26 coils) - apologies if that's not the right term. One of the smaller ones and the larger one only get partly warm, and usually closer to the top of the rad while the bottoms stay cold.
We live in a steam-powered building in Brooklyn and nobody else on our line is having heat issues. The risers get warm, as do all three supply valves feeding the rads from the floor. We called in a plumber who noted that:
1) Air vents are too high on all three rads. The contractor used the bushing at the top of the rad, on the opposite side of the supply, when they should've used the tapping about 1/3rd of the way up the rad. The current air vents that are on all three are Groton C's.
2) Apparently two of the three rads are installed "backwards". I am not sure what that means since the rads looks exactly the side on both ends to my untrained eye, but perhaps I missed something. Interestingly, the only rad that works was also called out by the plumber as having been installed "backwards".
3) None of the rads are pitched enough towards the supply.
While the plumbers were around, we got the super to put the boiler into bypass mode so that it was constantly pumping steam, and lo and behold, all three rads were heating up like you would expect. That debunked my theory that the two non-functioning rads were problematic.
Given the above observations, I'm still at a loss in understanding what to do. It certainly sounds like the venting location is an issue based on what I have read on here, however I don't understand how a rad can be installed backwards and what, if anything, that has to do with the fact that two of the rads are not heating up like the other one is .
Please help, and thanks in advance!