Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

New Boiler Short-cycling on Pressure Cut-out

2»

Comments

  • mattmia2
    mattmia2 Member Posts: 10,783
    https://forum.heatinghelp.com/discussion/comment/1816906#Comment_1816906

    The drip that is connected in the middle of the header probably isn't hurting anything but it is there because the header isn't plumed properly.

    This reducing ell that I circled isn't correct, it should be where the arrow is pointed down in to the header or as a reducer in the vertical section. The reducing ell in the horizontal section prevents the water from draining from the header in to the equalizer. The installer incorrectly tried to fix that by adding a drip to the header instead of putting the reduction in a vertical section.

    image.png

  • KC_Jones
    KC_Jones Member Posts: 5,809

    I just realized something. It appears both ends of that header have a reducer, so there is definitely water laying in the header all the time with no way out. The drip is literally on the high side of the dam doing effectively nothing.

    So odd.

    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
    mattmia2ethicalpaul
  • mattmia2
    mattmia2 Member Posts: 10,783
    https://forum.heatinghelp.com/discussion/comment/1816923#Comment_1816923

    yeah, i just saw the second reducing ell as i was marking up that picture and thinking flow in the direction of the equalizer, but with both reducing ells it is trapping water in that header they reused from the previous boiler (or 2)

    ethicalpaul
  • KarlW
    KarlW Member Posts: 122

    Here's an alternate (and admittedly less likely) explanation I didn't see posed:

    Do you have radiator valves off or TRVs? If you aren't actively heating the full EDR, then your boiler is effectively even more oversized - so you would be hitting the pressure cutoff much sooner.

    My system which is fully TRV'd (and smart) regularly short cycles regularly this time of year as it is only heating as few as 4 of 14 radiators at a time.

    ethicalpaul
  • dgn
    dgn Member Posts: 40

    In spite of the recognized flaws in the near boiler piping (pipe size reduction coming off the header, 3 mains coming off of a single takeoff from the header, etc.), the extensive skimming that was done completely stopped the short cycling and there's no water hammering. Though we're not yet into the fully cold heating season the full system is heating well, no pressure buildup whatsoever (I have monitored it regularly especially when fully hot), and quiet as anything — overall better than the previous boiler. All that said, I think I'm good for now. Thanks everyone for your input. Lots of good minds and experience here.

    bburdKarlWCLamb
  • neilc
    neilc Member Posts: 2,795
    edited November 8

    don't be surprised, or discouraged, if in a week or 2 you have to skim again, lots could be thrown up in the system to return later

    let it run and keep an eye, and ear, on it

    known to beat dead horses
    dgnethicalpaul

Categories