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Cosmogas Embassy Onex Wall Hung Condensing Gas Boiler

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Rverone
Rverone Member Posts: 8
in THE MAIN WALL

Dear Team,

I currently own an Embassy Onex wall hung condensing boiler.
We had it installed, after Super Storm Sandy beat up our area on Long Island.

I had issues since the installation by Sunray Services.
We have changed:

Mother Board
Expansion Tanks
Igniters
Exhaust Pipe

The list can be longer, but why boor you with my problems.

My current question is water pressure in the boiler?

My expansion tanks and high-pressure relief valve have been changed. We are still seeing in the boiler pressure over 20 PSI but less than 29 PSI. When the boiler goes through its cycle’s and pressure kicks up. Always under 29 PSI, we see water push out from the high-pressure relief valve and drip after.

How do I regulate the pressure correctly in the boiler?

My Sincerest Thanks,

Robert S.

Comments

  • Robert O'Brien
    Robert O'Brien Member Posts: 3,541
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    Cold pressure is 12 psi?
    To learn more about this professional, click here to visit their ad in Find A Contractor.
  • Zman
    Zman Member Posts: 7,569
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    Do you have drawings or pictures of the installation?
    Is a circulator pushing towards the relief valve?
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
    rick in Alaskamattmia2
  • kcopp
    kcopp Member Posts: 4,435
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    Zman said:

    Do you have drawings or pictures of the installation?
    Is a circulator pushing towards the relief valve?

    The onboard circ in that boiler is on the return....PRV suction side of the circ pump.

    To be honest the built in expansion tank in those boilers tends to be under-sided. Furthermore the life span on them is pretty short. I have replaced a fair amount of them and they are not a lost cost item.
    I have started to abandon them and install a regular EX30 in line in the system piping for a while now.
    When they work they are a good unit. They do have a few issues that can be dealt with.... most of the time.
  • Rverone
    Rverone Member Posts: 8
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    Dear Kcopp,

    Thanks for getting back to me.
    I have always had two external expansion tanks.
    One for Hot water Heater.
    One for The Boiler.

    I did a test today and ran the heat for over an hour at 90*.
    I then saw a continuous drip or the valve reaching 29 PSI when it would kick up.

    Any Suggestions.

    Sincerely,

    Robert S.

  • kcopp
    kcopp Member Posts: 4,435
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    Do you have any pix of the boiler and the piping? That would help us out.
  • gennady
    gennady Member Posts: 839
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    You have to charge expansion tank to the same pressure your feed valve set to. Also feed valve and expansion tank must connect to system at point of no pressure change.
    Gennady Tsakh
    Absolute Mechanical Co. Inc.
    mattmia2
  • SuperTech
    SuperTech Member Posts: 2,177
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    > @gennady said:
    > You have to charge expansion tank to the same pressure your feed valve set to. Also feed valve and expansion tank must connect to system at point of no pressure change.

    This is all correct. The point of no pressure change is the expansion tank. 15 PSI of air pressure should be in it when there is no pressure in the boiler or the tank is taken off. The boiler water pressure should be 12-15 PSI when cold. Ideally the circulator should be pumping away from the point of no pressure change.

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