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Single line steam

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Posted by tangirl on December 22, 2004 at 20:57:14:

I've got an old gas boiler with a single line system. The water is clear, it is halfway up the sight glass and the pressure switch is set to 1.5 psi. All the radiators are open fully and they are slightly tilted as they should be - had the level out today. I have made no changes to anything in the system over the last 5 years. There is no automatic feed for the boiler.

For the first 5 years I owned the house, it ran fine - never a problem. Now the pressure builds up so quickly that the boiler kicks off before the house heats up. The furnace turns off the moment the gauge passes the 5 psi mark as it sould, but from everything I'm reading here, the pressure should never be anywhere near there. The radiators all hiss, but not excessively (I don't think - no more than they ever did before) and all adjustable release valves are set to the highest number. They all get hot, but don't stay hot long enough to warm my house.

Also, the boiler doesn't reignite as it should. No matter what the temp in the house (47 when I got home today!) I have to manually turn on the boiler by pulling up on a little metal "button."

Any suggestions would be greatly appreciated. If you need more info (I did my best to provide the most based on everything I read here), let me know - anything if you'll help me get my heat working properly again! Thanks!

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