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Posted by Harold hydronicnetwork on February 17, 2004 at 17:52:26:
In Reply to: Several steam questions posted by George Walsh on February 17, 2004 at 16:16:49:
: This is a new Lennox (Dunkirk) gas steam boiler on ancient piping.
: Simplest first: I have the pressuretrol set at 2 with a 1 differential. System is quiet and steam is clean. But gauge on boiler never reads above .5. Is that correct?
*** It can happen. If the input and the output match to keep it at .5 that is good. However, it is possible the gauge is wrong. If the burner just keeps running until the thermostat turns it off, then the burner input is probably just closely matched to your needs.
: Next: Should the pigtail feel hot right up to the pressuretrol? It doesn't. I cleaned a lot of gunk (balls of oil, lint, corrosion) out of this system by skimming and draining since November. Should I have a pro check pigtail?
*** The loop should be cool at the top; it fills with condensate. Have the pro replace it instead of check it.
: Now the big one: Three radiators were re-piped during a renovation. Pipe size was reduced in process. Two small rads upstairs (one a short run, one long) do not heat unless I turn off a large one on first floor. I believe condensate may be trapped in two upstairs, but system pushes through it when large rad is off. Does this make sense?
*** Condensate shouldn't be trapped. If the pipe size is too small, it can happen.
All three are on same main. I replaced main vents on the two existing mains and get great heat everywhere else. Should one or another of the rads that were repiped be piped off the second main?
*** A pro would have to see it.
: Sorry for the complex questions...you guys are great.