Boiler pressure and leaking overflow


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Old 12-04-10, 05:16 AM
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Boiler pressure and leaking overflow

Last year my boiler was leaking out the relief valve my guy said it's pressure was a little high 20psi and the valve was faulty. Replaced valve and reset pressure to 12 everything was fine all winter. I noticed a little leak this year a few months ago from the overflow again. Runs all summer due to hot water. It would only leak 1 or 2 drops and only once every few weeks. Pressure at the gauge would read 12 to 14 psi would be cold or hot and a bit lower when the boiler was running. If I was home I would go down and check the pressure when the boiler ran. Never over 14. Fast forward to now and I had a guy come in for my yearly service yesterday. I left a note for him explaining the above. Asked him to check and reset pressure ect. This was not my usual guy as he was out of town, but a guy he recommended and the same guy that has worked on my dads and sisters stuff for years. I come home and the bill says I am all set he checked /cleaned/serviced everything. My wife said he mentioned something about the expansion tank being recharged too so I am assuming that could have been low causing the leak. He also noted that he reset the boiler to 18psi as that is what he finds works best. My question is that now It runs at 20 to 22 PSI when hot, 18 PSI when cold ( checked it at 80 degrees). Is this OK?? From everything I read you want 12 to 15 PSI. It has only been 3 days, but no leaks yet.
On a side note my PSI also goes down when the boiler is running and circulating, about 5psi. I did a search and I think it is because I am not "pumping away". Here are some pics of my system.




 
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Old 12-04-10, 06:45 AM
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18 PSI 'works better' ... and all those years it worked just fine with 12 PSI...

I agree that the pressure drop is caused by the setup, and as long as you don't have any other problems, that's not really something to worry about. Since your water feed is entering the system at the expansion tank, it's not likely to 'creep up' in pressure over time.

You will probably be OK... and given the way the system is set up, the guy might have valid reasoning for the increase in pressure. Let's just hope that he properly adjusted the pressure in the expansion tank, because if you change the setting on the pressure reducing valve, you also need to adjust the expansion tank pressure up to the same PSI.

One thing that you may have noticed that I always recommend is to verify the boiler pressure gauge. Any uncertainty about the accuracy of the gauge can cause you to run around in circles... for peace of mind it might be worthwhile.

I would say no problem... but continue to do due diligence.
 
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Old 12-04-10, 07:04 AM
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I am fairly confident that he adjusted the pressure tank because I asked him to check it and he also left me a note saying that had to press the Schrader valve up and down a few times because it was seeping and got it to stop. He did not replace it because he did not have one. He said to check it a few times and if it leaks to call him and he will come back and replace it.
Also a quick question for my own knowledge. Does the pressure reducing valve just set lowest operating pressure before water is added. Could he have not set the valve to 18 and just upped the pressure in the system and tank to 18. Meaning if the system leaked it would leak until below 12 and just fill up to 12 and needing to be manually increased to 18. He also said he closed off the water feed and to check the pressure regularly to see if it changes. I am assuming he is looking for leaks or increases in pressure for maintenance reason.
 
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Old 12-04-10, 08:13 AM
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He could have done that with the pressure is just bumped it. I am just curious that the installer put the circ on the feed to push away by he should of put the tank on return.

I know this is a silly question but which way is the arrow pointing on the circ??

Mike NJ
 
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Old 12-04-10, 08:18 AM
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It is pointing up towards the ceiling.
 
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Old 12-04-10, 08:45 AM
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Okay I have seen many backwards. LOL You go through alot of oil just for HW????
 
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Old 12-04-10, 08:55 AM
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LOL You go through alot of oil just for HW????

Joke or question?
For heat and hot water I go through between 3 and 400 gallons a year. I do have a woodstove that runs in the basement just out of the picture from November to April. I actually do not think he messed with the valve because there were still cobwebs on it when I checked.
 
 

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