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QSIMDO
02-02-2006, 05:24 PM
I have a 7 year old Weil McLain Gold series oil fired 4 section boiler and the pressure relief valve has been popping off lately.
Not regularly..no rhyme or reason.

Pressure is good in the expansion tank.
I put in a new 1156 about 2 months ago and even backed off on the feed pressure a tad as we only heat one floor.
Hot water is a Bock indirect heater, not leaking back at all.
The unit was cleaned and tuned about 3 months ago.
Any ideas?

chief
02-02-2006, 06:49 PM
Are you sur it is a relief valve or a vacuum breaker?

fixxit
02-02-2006, 06:54 PM
I had the same thing happen to me. It turned out that the bladder inside the expansion tank had ruptured and it was no longer able to respond to the small over pressures that occurred.

A new Extrol expansion tank did the trick.

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QSIMDO
02-02-2006, 07:06 PM
<font face="Verdana, Arial" size="2">Originally posted by fixxit:
I had the same thing happen to me. It turned out that the bladder inside the expansion tank had ruptured and it was no longer able to respond to the small over pressures that occurred.

A new Extrol expansion tank did the trick.

</font>

Cool, thanks...but was there water coming out of the air bleed in that case?
I don't have any water and the bleed is open.

QSIMDO
02-02-2006, 07:07 PM
<font face="Verdana, Arial" size="2">Originally posted by chief:
Are you sur it is a relief valve or a vacuum breaker?</font>

Nope it's the relief valve for sure.

meho
02-02-2006, 07:26 PM
QSIMDO,

The bladder could be busted, flat and stopping water from coming out of the bleed. Tap on the tank to see if it sounds full of water.

There should be about 12psi on the bladder. If nothing comes out when you press the valve it needs air.

James

QSIMDO
02-03-2006, 09:11 PM
One new Extrol #30 and we're back in business.
Thank you!