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  1. #1
    Join Date
    Sep 2012
    Posts
    6

    Boiler won't fire unless......

    I have a 35 year old Utica PEG-187S steam boiler running on a millivolt system. The gas control consists of a Honeywell

    VS820 with powerpile.

    The boiler will not fire up unless I momentarily short the two wires going to the TH terminals on the gas control. Once the

    boiler runs, it turns off on its own when the programmed temperature setting is reached.

    The pilot light works. I checked all the wiring and the low water cutoff switch.

    Can anyone suggest what may be causing this problem?

  2. #2
    Join Date
    Sep 2003
    Posts
    1,675
    You need to get a competent tech in there to do some thorough testing of the system.

    I really can't get into more specifics. It could be a number of things.

    This really isn't one for the diy guy. Millivolt systems are a different animal, most techs now really haven't seen them though they are making a comeback on a lot of newer fvir water heaters.

  3. #3
    Join Date
    Sep 2012
    Posts
    6
    Small Change, thanks for your reply.

    My system is not very sophisticated in that it contains no electronic controls. The VS820 gas control is connected directly to the thermostat and low water cut-off. The is no intervening electronic circuitry.

  4. #4
    Join Date
    May 2008
    Location
    Missouri
    Posts
    3,542
    We are not allowed to respond to DIY request. Against the rules for this board.

  5. #5
    Join Date
    May 2006
    Location
    Philadelphia, PA
    Posts
    1,391
    Which thermostat are you using?
    Climate Control Solutions for your Home or Office

    Serving Northeast Philadelphia and Surrounding Areas

  6. #6
    Join Date
    Sep 2012
    Posts
    6
    Honeywell RTH7600

  7. #7
    Join Date
    Jun 2007
    Location
    Minneapolis, MN
    Posts
    734
    Steam boilers should be serviced by experienced technician on a annual basis. Safety, efficiency and reliability dictate this requirement.

    There is no such thing as DIY steam boiler service.

  8. #8
    Join Date
    Aug 2012
    Posts
    2,663
    Shorting wires on gas appliance= kaboom
    My name is TooCoolforschool and I am a chronic over charger.

  9. #9
    Join Date
    Sep 2012
    Posts
    6
    I installed this boiler myself 35 years ago and have been maintaining it ever since then. I was a licensed high pressure steam boiler operator and am aware of the safety issued involved with steam. I do not think an experienced technician in needed in this case.

  10. #10
    Join Date
    Jun 2006
    Location
    Richmond, VA
    Posts
    2,916
    Quote Originally Posted by Portgas View Post
    I installed this boiler myself 35 years ago and have been maintaining it ever since then. I was a licensed high pressure steam boiler operator and am aware of the safety issued involved with steam. I do not think an experienced technician in needed in this case.
    then why are you here.

  11. #11
    Join Date
    May 2001
    Location
    carthage ms
    Posts
    632
    I know whats wrong with it, but sadly due to the site rules im not allowed to say what it is, anyone who has ever worked on milivolt systems will know also
    The 2008 NATE TOP TECH!!!!!

  12. #12
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,347
    Do you have a meter that can measure milivolts?

    Do you know how much juice the thermocouple should normally produce?

    I remember servicing thermopile wall and floor heaters out in California as a tech. Could give me fits at times trying to figure out problems on them. Walkaway lessons: tight and clean connections, sufficient power production from thermopile. Beyond that the points of failure become larger. That's all I can say.
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

  13. #13
    Join Date
    Sep 2012
    Posts
    6
    Shophound:

    I do have a meter which is capable of measuring millivolts.

    You have given me some sound advice. I checked and secured all connections. This seem sot have solved my problem.

    The thermopile should measure min of 560 millivolts up to 750 millivolts when not connected to the circuit. I have not performed this test yet but plan to.

    Thanks

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