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boiler keeps popping off relief valve...why?

paulypauly Posts: 3Member
i have a customer who's boiler keeps popping off..its about a half a bucket a day...i have changed the fill valve,extrol #30(on the return) ,relief valve, ane then the fill valve again...note there is no domestic coil to bleed thru..any more ideas you wetheads? Burnham v-15 138 output
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Comments

  • STEVEN MARKSSTEVEN MARKS Posts: 154Member


    If fill valve and expansion are both on the return that could be your problem. When pump starts fill valve sees a decrease in pressure and opens to add more water.
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  • STEVEN MARKSSTEVEN MARKS Posts: 154Member


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  • STEVEN MARKSSTEVEN MARKS Posts: 154Member


    If fill valve and expansion are both on the return that could be your problem. When pump starts fill valve sees a decrease in pressure and opens to add more water.
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  • STEVEN MARKSSTEVEN MARKS Posts: 154Member


    sorry computer keys stuck
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  • freyheating265342freyheating265342 Posts: 14Member


    Did you check the pressure in the extrol. How much pressure on the gauge when you arrive on the seen. 30lb safety ?
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  • Pauly

    First off, I would like you to determine whether the relief valve is popping off due to excessive makeup water or static fill pressure or if the temperature in the boiler is becoming excessive. I will first advise shutting off the cold water supply to the Pressure Reducing valve once the 12-15# static fill has been established. If, with this makeup water shut off, the relief valve still blows off, take a close look at the temperature gauge to see if it is excessively hot (220F+). If this is the case, I would look to determine if the circulator for the system might be in backwards. There is usually a direction of flow arrow on the circulator cast into the water end housing. The flow should be from the top boiler supply connection to the bottom return tapping. If it is pointing the other way, that may be the problem being caused by cooler return water washing past the aquastat bulb due to reverse flow. Let us know.

    Glenn Stanton

    Manager of Training

    Burnham Hydronics

    www.burnham.com
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  • GuyGuy Posts: 159Member
    locked in

    you might also want to make certain that the extrol tank is not "locked" in between a flow check and zone valve, or a similar situation. That little gem kept me busy for a few trips to a home in my early years.

    Guy
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  • RichardRichard Posts: 40Member


    Paul, did you check the pressure in the extrol 30, and it might be possable that you need an extrol 60? There might be too much water in the boiler and piping for the 30 to absorbe the thermal expansion.
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  • Tom M.Tom M. Posts: 237Member
    There's no domestic coil,

    but is there an indirect? I was in a similar situation and found one in another room. It wasn't prioritized or labeled so it looked just like a heat zone from the boiler room.
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  • greggreg Posts: 71Member


    How can you check the pressure in the diaphram tank with out letting some out? Is 15lbs normal?

    Then what's the best way to add it. Do you take it off and use a foot pump or the like?
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  • ScottScott Posts: 5,884Member
    exactamudo

    You remove the tank from the system and check it with a tire preasure gauge. If its down or you think you have let out to much pump it back up with a bicycle pump.

    You acutally should check every tank before it gets installed, no telling what preasure you get out of the box. Ask Dan !!

    Scott

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
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  • greggreg Posts: 71Member


    I figured.
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  • glennglenn Posts: 2Member
    pressure

    did you check to see what the incomeing water pressure is on the water main you may have high pressure that the feed valve cant hold back and water is creeping past the feed valve. incomeing pressure on water main should be between55 and 65 lbs.
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  • glennglenn Posts: 2Member
    pressure

    did you check to see what the incomeing water pressure is on the water main you may have high pressure that the feed valve cant hold back and water is creeping past the feed valve. incomeing pressure on water main should be between55 and 65 lbs.
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  • paulypauly Posts: 3Member


    THANKS FOR THE INFO I HAVE BEEN TAKING CARE OF THIS BOILER FOR YEARS ...THE PUMP AND ALL THAT IS CORRECTLY INSTALLED I I LEANING TOWARDS A RUNAWAY..I WILL LET U KNOW WHEN I FIND OUT
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  • paulypauly Posts: 3Member


    BEEN THAT WAY FOR YEARS ....WHY ALL OF A SUDDEN?
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  • ragsrags Posts: 4Member
    boiler

    just installed a new hot water boiler  about 3 months ago  got a call back  yesterday on boiler relief valve  kept leaking by   i checked all the  water feed valve and  expansion tank    everything seems to work  great   im thinking if the inderct water heater has a pin whole on coil  would that cause the the pressure to rise in boiler  and pop the reilef valve
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  • ragsrags Posts: 4Member
    boiler

    just installed a new hot water boiler  about 3 months ago  got a call back  yesterday on boiler relief valve  kept leaking by   i checked all the  water feed valve and  expansion tank    everything seems to work  great   im thinking if the inderct water heater has a pin whole on coil  would that cause the the pressure to rise in boiler  and pop the reilef valve
    · ·
  • ragsrags Posts: 4Member
    boiler

    just installed a new hot water boiler  about 3 months ago  got a call back  yesterday on boiler relief valve  kept leaking by   i checked all the  water feed valve and  expansion tank    everything seems to work  great   im thinking if the inderct water heater has a pin whole on coil  would that cause the the pressure to rise in boiler  and pop the reilef valve
    · ·
  • ragsrags Posts: 4Member
    boiler

    just installed a new hot water boiler  about 3 months ago  got a call back  yesterday on boiler relief valve  kept leaking by   i checked all the  water feed valve and  expansion tank    everything seems to work  great   im thinking if the inderct water heater has a pin whole on coil  would that cause the the pressure to rise in boiler  and pop the reilef valve
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  • RobGRobG Posts: 1,145Member ✭✭✭
    edited March 2013
    Absolutely

    Yes, if your indirect has a leak in the coil it will cause the symptoms you are describing. Try valving off the indirect, lowering boiler pressure to system requiriments, run boiler up to temp and watch pressure. If it stays within parameters you have your answer. Then to confirm, open valves to indirect and see if pressure rises.Rob
    Post edited by RobG on
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