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Old 10-26-2011, 07:04 AM   #61
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pressure relief valve is leaking on boiler


You probably should have replaced the auto fill valve as referenced back some 50 posts ago, by the looks of that valve and the aggravation you have been going through is it worth it? A new valve is cheap as is a new expansion tank with an air separator and auto air bleed. Even if your system is old and needs replacement, in the near future you could have kept the fill valve with the new expansion tank. For less than $100 you could have done all this and still can. Not trying to make you a parts changer but sometimes things just need to be replaced.

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Old 10-26-2011, 11:19 AM   #62
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pressure relief valve is leaking on boiler


I will turn off expansion tank, drain the expansion tank and open the union on the pipe going to expansion tank from the boiler to let in air while draining. (No venting cap on expansion tank)

If PSI falls below 12, while draining tank, I will turn water to boiler back on to refill to 12PSI, then shut the water off again.

Then open expansion tank and turn boiler back on.

If this works/ even if it doesn't. I will purchase a new auto fill valve and expansion tank to put on. Found out the boiler was put in 20 years ago and it won't hurt to have these new parts.

After turning boiler back on, should I bleed radiators to make sure they still have water in them?

Last night they were hot, except one, it was warm (on second floor).
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Old 10-26-2011, 11:26 AM   #63
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pressure relief valve is leaking on boiler


What is a good brand expansion tank? The place I get parts from sells Extrol Boiler Expansion Tanks by Amtrol, in in a 2, 4.4 or 7.6 gallon. How do I determine what size tank to buy?
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Old 10-26-2011, 04:29 PM   #64
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pressure relief valve is leaking on boiler


Amtrol is good.




PS: Don't worry about boiler pressure while draining the expansion tank. Adjust it after you reopen the valve to the tank.
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Old 10-26-2011, 05:23 PM   #65
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pressure relief valve is leaking on boiler


Quote:
Originally Posted by wlmpdiycr View Post

If PSI falls below 12, while draining tank, I will turn water to boiler back on to refill to 12PSI, then shut the water off again.

Then open expansion tank and turn boiler back on.
Leave the water off until the tank is drained. Very common to see a lower pressure while draining the tank.

You need to drain the tank, let it sit to get the air in the tank. No air or not enough air will give you higher pressures.

When this is done then you can open the valve to the tank and then turn on the water to the prv. Then it should stop at around 12psi.

If not then maybe it is better to call a pro to check it out.....
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Old 10-26-2011, 06:00 PM   #66
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pressure relief valve is leaking on boiler


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Originally Posted by wlmpdiycr View Post
What is a good brand expansion tank? The place I get parts from sells Extrol Boiler Expansion Tanks by Amtrol, in in a 2, 4.4 or 7.6 gallon. How do I determine what size tank to buy?
Look on line for the tanks you listed there should be a tank sizing calcular that will ask you several questions, IE: gallons of water in system, temperature ranges, pressure ranges then it will give you the size tank you need.

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