Boiler shuting off

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  #1  
Old 02-13-08, 03:19 PM
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Boiler shuting off

I have a boiler which constantly shuts off.
It has done this since new (4yrs)
I replaced the boiler as soon as I moved into this house because the old one was shot so I dont know if this happened before.
Its a Carrier steam boiler (radiators) and shuts down evertime the preasure gets to 6pds. then it shuts off untill the preasure drops then refires.
Everone who looks at it says its needs cleaner then ethier they or me add cleaner and let the boiler run for a week then drain but the problem dosent go away,
Any suggestions.
The house is a small cape style.
 
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Old 02-13-08, 05:50 PM
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6 lbs?

It sounds like the controls are doing what they are supposed to do. My question is why is the boiler operating at such a high pressure? Most residential steam boilers operate at around 1 lb.
 
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Old 02-13-08, 07:04 PM
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I don't know why the preasure is so high.
Do you have any ideas of why it would run so high.

Thanks
 
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Old 02-13-08, 08:34 PM
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6 pounds is probably the problem. Like Grady said, residential steam should typically run at about 0.5-1 pound.

I suggest finding a good steam guy, which depending on what part of the world you're in, might not be too easy.

Is this a 1-pipe or 2-pipe steam system?

It's entirely possible that the installation (piping, venting, etc.) isn't right, and the high pressure is an attempt to mask the problem. Looking at the Carrier site, it appears they don't want Joe Public to have easy access to the install manual, otherwise I'd suggest comparing the manufacturer piping diagram to what you have. Chances are there is no Hartford loop, missing or improperly sized main vents, etc.

And that's everything I know about steam....

If you can take some pics of the boiler and nearby piping, and host them at photobucket or similar site, please do. I'm quickly (already) out of my depth here, but others might benefit from seeing, and there are a few basic steam no-no's that are obvious even to a steam-clueless guy like me. Or at least we could provide a starting point for questions to ask a real steam guy.
 
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Old 02-14-08, 07:13 AM
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Agreed pressure is the way toooooo high. The more pressure the boiler makes is an exponential fuel increase. In other words the amount of fuel it take to raise the system to 1 pound is increased when the system goes to two pounds. The amount of fuel to go to go from 2 - 3 pounds is more than it took to go from 1 – 2 pounds, etc. The pressures can be turned down very easy. It is normal for a steam boiler to cycle on and off during a run cycle. The boilers of today make steam a lot faster. There may be other issues also. Does the water level drop or bounce dramaticlly? Was the boiler sized from the radiation and not off the old boiler? Is the main piping in the basement insulated? Do you have and are the main line vents working? Is the near boiler piping correct? Posting some picture would help
 
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Old 02-14-08, 07:00 PM
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I posted a pic below (I hope).
The house orginally had the 8 radiators but the previous owners removed 3. Now have 5
I was told the loop was done right but see photo below.
The water does bounce about an 1/2" to 1".
If someone can recomend a knowledgable steam guy I am open to that option just dont want here it needs cleaner again.

Thanks for help.


<a href="http://s250.photobucket.com/albums/gg270/Toolmon/?action=view&current=Boiler1.jpg" target="_blank"><img src="http://i250.photobucket.com/albums/gg270/Toolmon/Boiler1.jpg" border="0" alt="Boiler1.jpg"></a>
 
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Old 02-14-08, 07:26 PM
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If the water level is only bouncing about 1/2" it does not need cleaned. Is the only complaint is it shuts off? Does it heat the home? I think it is just going off on pressure which may be normal. Again the pressure is way too high.
The near boiler piping is aaaaaahhhhh, I have seen worse. I do not think it is causing you problems though other than maybe steam which is a little wet. What is the complete model number and also it should have a sq ft rating.
How long does it run before cutting off on pressure?
 
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Old 02-14-08, 08:11 PM
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The boiler takes about 10 min to start making steam from when its totally shut down.
Once the water inside starts boiling the preasure will slowly go up (about 10 min) until it hits 6pds. at this point it will shut down until the presue drops below 5 pds then it fires up again.
It will do this until it reaches the desired temp set on the themostat.
I could do this for 2 to 3 hrs straight. shuting on and off ever minute or so.

Modle #BSAANOO112ABAA
I am trying to locate the sq ft.
 
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