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.

Pressuretrol settings

skimmer
skimmer Member Posts: 76

before:

after:

now I have to repack the nut on one of the radiator stems that’s leaking.

What do you think of the new settings?

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,364

    Widen the differential to 1 psi.

    What you want is the boiler to shut off at 1 1/2-2 psi. You want the boiler to restart at as low of a pressure as you can adjust it for ….just before the gauge needle hts 0 psi. Yo may need a 0-5 psi gauge to adjust for this as doing it with a 0-30 psi gauge will be difficult if not impossible.

    EdTheHeaterManethicalpaul
  • CoachBoilermaker
    CoachBoilermaker Member Posts: 332

    There was a good tip in here about tightening the packing nut.

    Tighten it while the heat is running, so you only tighten enough to silence it, and not more

  • skimmer
    skimmer Member Posts: 76

    yep I repacked it while cold and then had to tighten while the heat was coming up as it still leaked until it stopped

  • skimmer
    skimmer Member Posts: 76

    I am thinking of removing the pressuretrol and putting in a vaporstat.

    What would be a good starting point for settings??


  • Jamie Hall
    Jamie Hall Member Posts: 24,699

    Right where that one is set.

    However! Being absolutely level is critical with the mercury vapourstats. Even a tiny bit off can throw it several ounces out of calibration. Be sure that the pigtail on which it is mounted has the curl perpendicular to the body. I also recommend putting a quality low pressure gauge on the same pigtail to see what it really is doing, and adjusting the instrument to match the gauge.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England