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  1. #1
    Join Date
    Jan 2013
    Location
    Dyersburg, TN
    Posts
    123

    steam boiler control

    I am looking for a way to control a steam boiler that has gravity return condensate. Do i reset the steam pressure with OSA? Need some ideals thank you for any help.

  2. #2
    Join Date
    Sep 2002
    Location
    Hampton Roads, Virginia
    Posts
    1,557
    No you can not reset steam pressure, if you need to do anything then do a duty cycle based on OSA temperature.

    Kevin
    "Profit is not the legitimate purpose of business. The legitimate purpose of business is to provide a product or service that people need and do it so well that it's profitable."

    James Rouse

  3. #3
    Join Date
    Jan 2013
    Location
    Dyersburg, TN
    Posts
    123
    So there is really no controling a steam boiler beside a on/off input. Up for any suggestions

  4. #4
    Join Date
    Jun 2012
    Location
    Northeast
    Posts
    210
    You should look into the Heat Timer controls.

  5. #5
    Join Date
    Jan 2013
    Location
    Dyersburg, TN
    Posts
    123
    Quote Originally Posted by Push It View Post
    You should look into the Heat Timer controls.
    could you explain?

  6. #6
    Join Date
    Jun 2009
    Location
    StL, MO
    Posts
    572

  7. #7
    Join Date
    Jan 2013
    Posts
    19
    There is no way to reset steam as there is with water in a Hydronic System. In a one pipe system you would want to be certain the thermostatic air vents are working correctly at the radiators and that condensate is returning properly. If it is a two pipe system you would want to be certain the steam traps are not leaking by and the condensate is returning to the condensate receiver correctly. With steam it is more making certain the system is working according to design. The start stop time could work but could be a more complex strategy.

  8. #8
    Join Date
    Sep 2008
    Location
    Cedar Rapids, IA
    Posts
    476
    I have a customer with an old 8 story bldg. that has poor insulation on the steam pipe risers and condensate return runs. They used to turn the steam on and off several times a day by hand because the radiant heat from the pipes in the walls would cause a lot of offices to be way to hot.

    We put in a duty cycle timer that turns the steam on and off at 45-60 minute intervals. The length of time it remains on varys from a few minutes at 50 degrees outside air temp to the full 45-60 minutes at 20 degrees oat. (it never shuts off below 20)

    This made a bad situation tolerable at a minimal cost and saved a lot of money because the hot offices no longer need to open their windows in the winter time.

    Ideally the whole building should be updated, but old buildings don't generate a lot of rent.

  9. #9
    Join Date
    Jan 2005
    Location
    steeler nation
    Posts
    2,027
    heat timers work. i have been using them for decades.
    IV IV IX

    use your head for something other than a hat rack.......Gerry

  10. #10
    Join Date
    Feb 2009
    Location
    Northeast
    Posts
    320
    On old steam systems sometimes a lower steam pressure setpoint will do wonders. I have had to change operating controls that operate at a PSI setpoint "Pressuretrol" for a "Vaporstat" that operates in ounces. With steam radiators the pressure is not what delivers the heat. The phase change of the steam is the heat source. Evidence of too high a steam pressure is overheating some rooms and condensate return problems. Of course there are other problems that produce those same symptoms (traps, vents, leaks, blockages). Honeywell L408J1009

    Bill

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