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Old 02-26-2011, 09:55 PM   #16
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Crown Boiler Leaking Out Pressure Relief?


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Originally Posted by beenthere
BUT, you never check a tank while it is attached to the system.
Yes you can and that's the way it's normally done. If I have an expansion tank on a 30 story condo tower do I have to drain the system down to test the tank hell no. That's why I said install an isolation valve it allows you to work on it.

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Old 02-26-2011, 10:25 PM   #17
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Crown Boiler Leaking Out Pressure Relief?


bleeding can be hard if you have a multi story home. if you have problems we can help you though that part, but the exp tank should be easy for you.
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Old 02-26-2011, 10:40 PM   #18
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Crown Boiler Leaking Out Pressure Relief?


I've got just a one level ranch home. It's got one zone in the basement and 2 zones upstairs. I guess you'd call that one level but 2 levels of heat.
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Old 02-27-2011, 05:17 AM   #19
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Crown Boiler Leaking Out Pressure Relief?


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Yes you can and that's the way it's normally done. If I have an expansion tank on a 30 story condo tower do I have to drain the system down to test the tank hell no. That's why I said install an isolation valve it allows you to work on it.
An isolation valve and a vent valve will allow you to check it.

His has neither. And since 99.99% of resi doesn't have one, saying never check it while attached to the system, holds true. Since we're talking about resi systems.
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Old 02-27-2011, 09:35 AM   #20
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Crown Boiler Leaking Out Pressure Relief?


Well I messed with it a little more this morning after it cooled down completely over night. If I push in on the shrader valve with a screwdriver water doesn't pour out, I maybe get 6-8 drips out and that is it. If I tap on the tank it does sound hollow at the bottom half and full at the top half. Could it just be moisture dripping out?

Also, I drained off all pressure in the system with the pressure relief valve until the gauge on the boiler showed 0 psi. Then I aired up the expansion tank to 13 psi on the boiler gauge AND my tire pressure gauge. It held that pressure on both gauges for the hour that I waited. I then bled off the system with the pressure relief valve again. Then I checked the expansion tank pressure with my tire pressure gauge and it read 0 psi. Shouldn't that have stayed at 13 psi? I'm just trying to trouble shoot it to see if it's something I want to deal with myself or just call in the heating guy.
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Old 02-27-2011, 11:44 AM   #21
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Crown Boiler Leaking Out Pressure Relief?


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Shouldn't that have stayed at 13 psi?
Ayuh,... The tank should hold it's own pressure, Yes...

Try to pump it back up, with the boiler unpressurized...

Sounds like ya mighta found the main Problem though...
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Old 02-27-2011, 12:06 PM   #22
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Try to pump it back up, with the boiler unpressurized...
I did that and it seemed to hold pressure. But I'm wondering if the air I'm pumping into the expansion tank is just going by the bladder and then pressurizing the whole system seeing I can't isolate the tank from the rest of the system (no valve). When I pump it up the gauge on the boiler goes up accordingly. So I thought if I released the pressure with the pressure relief valve, the expansion tank should have held some pressure but I got 0 psi on my tire pressure gauge.

Maybe I need to hold the pressure relief valve open when I air up the expansion tank?
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Old 02-27-2011, 01:56 PM   #23
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Quit screwing with it. Just replace the tank. And DON"T screw with the air schrader, you will mess up the tank's pressure.
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Old 02-27-2011, 02:06 PM   #24
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Crown Boiler Leaking Out Pressure Relief?


replace the Exp tank, replace the relief valve, and refill

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