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Old 10-22-2011, 06:11 PM   #31
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pressure relief valve is leaking on boiler


I don't think cold water should ever be injected into a overheated Boiler and if it was installed properly the feed water would not be injected into the boiler but into the system for tempering before returning to the boiler. B & G so what they are only a manufacturer, who cares what one manufacturer's says, do you do every single thing manufacturer's say? I don't think so.

Autofil's are not required but they are on every system I have seen, it's up to the installer to set the pressure HA HA now I know why their installed.

I think they should remain open to the system until all the air is out, who knows how long that will take? A Boiler running dry is the worst another thing is if the valve is overfeeding it won't ruin the house it would come out the pressure relief valve which is usually piped to a drain or is in the basement and someone would notice it. Q Can you tell me why 99% autofil valves are left with line pressure on them or main valve feeding open. I don't' ever want a boiler running dry that's it. Don't tell me they won't blow or burn or melt down.

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Old 10-22-2011, 06:59 PM   #32
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pressure relief valve is leaking on boiler


Nothing to blow if the boiler is dry. Melt down is possible on higher fired boilers that are cast iron, but few residential are fired high enough to melt cast iron. Steel boilers could melt through. But no damage to the house from melting through unless its installed in a manor that is not approved.


Number ONE reason those auto feeds your talking about are left open. Is that the installer isn't willing to take the time to bleed and purge the system like he is suppose to. A form of laziness.


B&G is the manufacturer of pressure reducing valves, they know the reliability of them. No boiler manufacturer recommends that you leave the shut off valve to a PRV open.
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Old 10-24-2011, 12:39 PM   #33
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pressure relief valve is leaking on boiler


Again,, sorry about confusion. Will post a picture of the position the pressure relief valve has been in throughout this journey, So last night I tried cutting off the water to the boiler. PSI was 1t 18, and turning on boiler. It stayed at 18 PSI for about 45 minutes, then it started going up. I shut boiler down at 25 PSI, the boiler was on for 1hour & 30 minutes. The expansion tank was open. Oh yeah, I did drain expansion tank before I cut boiler on. Both floors radiators were hot. Could the expansion tank be the problem or/and should I replace water feed valve? We don't have a low water PSI shut off.
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Old 10-24-2011, 12:41 PM   #34
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pressure relief valve is leaking on boiler


the water feed valve
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Old 10-24-2011, 12:44 PM   #35
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pressure relief valve is leaking on boiler


Post pic of expansion tank. And post how you drained the expansion tank. The complete process of what valves you opened and closed.
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Old 10-24-2011, 12:48 PM   #36
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pressure relief valve is leaking on boiler


What are the steps in bleeding and purging the system? Maybe I'm doing a few things wrong.
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Old 10-24-2011, 12:54 PM   #37
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pressure relief valve is leaking on boiler


The system, or the expansion tank?

Would need more pics of boiler and expansion tank to give better/more appropriate steps/instructions for doing it.
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Old 10-24-2011, 01:07 PM   #38
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pressure relief valve is leaking on boiler


We connected a hose to the expansion tank drain, shut of the water going into the expansion tank, then open the drain. Filled a 5 gallon bucket. (the water going to the boiler was open at the time). When the water no longer came out of hose, we closed the drain, removed hose and open the connection between the boiler and expansion tank.
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Old 10-24-2011, 01:11 PM   #39
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pressure relief valve is leaking on boiler


Does the shut off valve to the tank, have a vent cap on the other side of it? If not, how are you letting air into the tank to drain it?
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Old 10-24-2011, 01:11 PM   #40
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pressure relief valve is leaking on boiler


What are the steps in bleeding and purging the system and the expansion tank? I will put up more pictures of the system if needed when I get home. Is there a particular picture you what me to take?
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Old 10-24-2011, 01:13 PM   #41
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pressure relief valve is leaking on boiler


The piping at the boiler. So I can see if ti has a purging set up or not, and how the set up is installed to say how to do it.

If there is no vent cap on the shut off valve, you need to loosen the union between the tank and valve to let air into the tank while you drain it.
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Old 10-24-2011, 01:16 PM   #42
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pressure relief valve is leaking on boiler


Never checked. Was told by a plumber that when the water coming out of hose start making a burping noise that that was are going into the hose as the water trickled out. So when I drain tank I should open up the cap in the back to let air in? How long and when do I open cap?
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Old 10-24-2011, 01:22 PM   #43
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pressure relief valve is leaking on boiler


These are the pics I have on me - will send more later

1st boiler
2nd boiler
3rd shut off to expansion tank
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pressure relief valve is leaking on boiler-sspx0140.jpg   pressure relief valve is leaking on boiler-sspx0141.jpg   pressure relief valve is leaking on boiler-sspx0195.jpg  
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Old 10-24-2011, 01:36 PM   #44
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pressure relief valve is leaking on boiler


When the water stop coming out of the tank, crack the cap open slowly and leave air into the tank. Leave open until no more water comes out. close cap and drain valve. Then add water to boiler until its pressure reaches 12 PSIG, if you have a 2 story house and the highest rads/heat emitters are no more then 20 foot above the boiler.

No purge set up in the boiler pics. If you have cast iron rads, they should have vents on them for you to leave the air out.
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Old 10-24-2011, 03:06 PM   #45
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pressure relief valve is leaking on boiler


So when I drain the expansion tank, the PSIG should drop below 12PSI? Have cast iron rads with vents. When the boiler was off. We bleed off rads, all but two had water come out, but the boiler was off. Should it only be bleed when boiler is on?

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