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Oil boiler pressure guage concern

Blackhall8 Member Posts: 3
edited November 20 in Oil Heating
I had a leaking Taco circulator pump replaced a few weeks ago and just noticed the pressure guage on my Utica oil boiler is now reading at 28 psi and the red arrow beneath it is pointing at 170. Is this normal? Prior to the circulator replacement the guage was reading at 16 psi and the red arrow was at 72.  
Just curious if I should call my oil service company back to take a look.


    HVACNUT Member Posts: 5,464
    It's reading about 28 psi at 135°. Too high if the gauge is correct.
    The Red indicator moves and should be at the 30 psi mark which should be the pressure rating on the relief valve. 
    If it was 16 psi beforetherepair, it was either over pressurized after the repair, or the gauge is faulty, or there's an issue. 
    Call them back. It could be unrelated to the repair. 
  • Blackhall8
    Blackhall8 Member Posts: 3
    Thanks @HVACNUT. I just realized the red dial can be moved manually by simply turning the outer ring of the guage. I just rotated it in the photo below. Is this normal?

    i just took another photo this morning with both zones of my hydro air system running + boiler running. 140 degrees and 30 psi. 

  • realliveplumber
    realliveplumber Member Posts: 231
    It looks like its at about 28.

    The gauge could be not reading correctly, or, if it is, you have a problem with thermal expansion.

    Your relief valve should release at 30 psi.

    I would definitely get it diagnosed and repaired
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,373
    Probably never bled correctly, or maybe they flood your steel expansion tank.
  • Blackhall8
    Blackhall8 Member Posts: 3
    I’m going to drain a little water out of my boiler and see if that keeps the pressure down. I called my oil service company and they suggested this method before sending someone out. I’m assuming when they installed the new circulator pump, they forgot to do something. My expansion tank is ok - hollow at the bottom and clear plastic nipple is still clear.