Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
top floor rads not getting hot
i looked at a job yesterday and to my knowledge it is one of the only two steam systems in our area.it is a two pipe system with one main hoffmann #75 vent installed on what i think is the f&t trap in the boiler room.the owner had said that the three radiators on the top floor have never gotten hot since he has owner the house.when i got there the boiler had been off at the thermostat for several hours.the burner fired up and the first thing i noticed it took about twenty minutes for the steam header directly over the boiler to get hot,this was on a day when it was 50 outside.while this was happening the hoffmann vent had a very faint amount of air coming out of it.the rads on the first floor got very hot,however these three rads located about ten feet above the first floor were ice cold.i disconnected the inlet to one of the traps on the radiators,got a little air out of it,but then nothing.no air,condensate,or steam.at this point the first floor where the room thermostat is got very warm,the room temperature had risen 5 degrees in twenty minutes, and shut the burner off.the pressure on the boiler had barely gotten to a half pound,and the hoffmann vent still had very little air coming out of it.i can tap on the side and here the the float inside move,so i am fairly certain it is not plugged. could it be the the air is not leaving the system fast enough for the staem to get past the first floor?i know this is a long story but i am looking for suggestions to what could be causing this,before i take it any further.the steam main if it helps comes off the top of the boiler and runs about 26' and the has all the branchs coming off of it into the walls and floors.none of it is insulated which we know is not helping.any suggestions would be much appreciated.thank you, and i will try and post some pictures