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Steam System Not Performing
After having enough of high oil bills (1800 gals/yr), finally converted to natural gas. Used a highly regarded guy to perform the conversion. After the conversion, several of my radiators will not warmup. I mean nothing. System was not very balanced in years past anyway, but this situation will be problematic when the weather finally turns cold. The cold radiators are mostly on first floor in the room where the thermostat is located. The system fires up, runs for 2-3 hrs and finally shuts off when call for heat is satisfied. As you can guess, the second floor is very warm and the first floor is cold.
I have had no luck finding a good steam guy locally (New Bedford, MA). So I bought Dan's book and started reading. I now know enough to be dangerous. Looks like I need some guidance to evaluate what I have and where I need to go. I like the elegance and simplicity of steam and would like to make this system work as originally intended.
Here are the particulars:
Burnham V78 Steam Boiler with Carlin EZGas burner. Nameplate data is 249MBTU/hr input, IBR NET 187MBTU/hr, 778 sq feet steam. EZGas burn rate clocked at the meter at 240MBTU/hr. Honeywell pressuretrol set as low as I can after cleaning out the siphon tube (5-15 psi subtractive unit ... should replace this). I calculated all the EDR of my radiators (had to find a 1910 HB Smith catalog as all of my radiators are Princess models which are larger than standard EDR charts). Total installed EDR is 633. Insulation has been removed on the basement pipes but remains on the risers to the second and third floors. I checked the runout and main sizes against the recommendations in Dan's book and I look good for the most part. Venting on my mains use Hoffman 75's (one each main) and a second VentRite on my 3 inch main.
Biggest concern is to get my three large radiators on the first floor to heat up. One remains stone cold, another gets warm (not all the way to the last section) and then cools off and the last (on a different main) gets luke warm only for a few sections. Without these radiators working, the system takes forever to satisfy the call for heat.
Any ideas on where to look next? Any recommendations on a goof steam guy in my area? Thanks for listening.
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