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Old 02-22-2010, 11:18 PM   #46
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Boiler Relief Problem


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Originally Posted by beenthere View Post
Ok.

From original fill up. Water pressure in system while cold is 12 PSIG.
Water is then heated up to 180. Pressure on boiler side of BFP is now 18PSIG, pressure on PRV side is still 12PSIG. BFP now vents out excess pressure to keep entering and exiting pressures the same.
Boiler temp lowers and pressure on boiler side of BFP now drops below 12PSIG, auto feed now lets more water in. Boiler gets a call for heat. Process starts over. And over and over and over.
If you are saying that it is normal to have a fluctuation of up to 6 psi in the system from cold to hot to cold, how can the auto feed not keep adding water to the system? I guess I'm just curious as to the mechanical engineering in the device.

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Old 02-22-2010, 11:25 PM   #47
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Boiler Relief Problem


If the auto feed is set to 12PSIG, and fills the system to 12 PSIG with cold water(50 to 60F water). Then the system pressure can't drop below 12 PSIG when it cools down again, since the water won't be as cold when it was filled with the cold water.
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Old 02-23-2010, 07:55 AM   #48
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Boiler Relief Problem


If you would swap the BFP and feeder around we could at least put an end to that issue, but since the pressure is gaining with the valve shut off you still have a problem that's pretty easy to diagnose. Drop the pressure on the system, pull the expansion tank and see if it's full of water. then see if it has about 20 lbs pressure in it.
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Old 02-23-2010, 11:16 AM   #49
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Boiler Relief Problem


BFP should have nothing to do with the operation of the boiler.

What about the boilers in operation that have no BFP.
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Old 02-23-2010, 12:23 PM   #50
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Boiler Relief Problem


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BFP should have nothing to do with the operation of the boiler.

What about the boilers in operation that have no BFP.

Exactly!
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Old 02-23-2010, 05:18 PM   #51
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Boiler Relief Problem


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Originally Posted by SULTINI View Post
BFP should have nothing to do with the operation of the boiler.

What about the boilers in operation that have no BFP.

Installed before the PRV, it has no effect on boiler operation.

Boilers without BFP have no device installed incorrectly and needlessly venting boiler water.


The OP's may or may not be venting water.
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Old 02-23-2010, 05:27 PM   #52
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Boiler Relief Problem


Thanks That's where I thought this was going after post #12 a couple of us was trying to tell the OP to change the position of the BFP then get into the troubleshooting.
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Old 02-23-2010, 06:03 PM   #53
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Boiler Relief Problem


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Thanks That's where I thought this was going after post #12 a couple of us was trying to tell the OP to change the position of the BFP then get into the troubleshooting.

The OP is posting on another site. And then checking their answers here.
So he is just making everything harder.
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Old 02-24-2010, 06:14 AM   #54
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Boiler Relief Problem


Now I got it thanks.
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Old 02-25-2010, 07:23 AM   #55
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Boiler Relief Problem


All:

Tuesday morning I decided to check the expansion tank. Shut the supply and return on the primary loop and then emptied the boiler. When boiler wouldn't drain anymore the pressure still read 2-3 psi which was a surprise- gauge out of calibration?

Checked the expansion tank- no water came out but it would barely push the rod out of my pressure gauge. Took your advice beenthere and installed a new 60. Read about 12 psi out of the box and charged it to 20 psi before installing.

Had a hard time trying trying to get the system filled with water. Tried to depress the auto feed lever but the increased pressure would just blow the relief. Three hours later it showed 12 psi so I fired the boiler. I took notes on the psi/temps but don't have them here. Long story short, next morning there was no water in the bucket under the relief. Seemed to be running 20-21 psi when hot (180). At night, seems to show 14-15 psi when cold (80). This morning again no water. PSI 21 at 190.

I was not able to adjust the auto feed because it was taking so long to fill the system. I noticed the relief seems to start to open when the pressure shows 24-25- which seems low to me. Appreciate your thoughts. Posting to the other sites because seems like certain guys use certain sites and wanted as much feedback as possible. Thanks again...
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Old 02-25-2010, 01:41 PM   #56
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Boiler Relief Problem


Your welcome.
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Old 02-26-2010, 06:52 AM   #57
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Boiler Relief Problem


System cold is showing 10-12psi and hot after recovery is showing 21-24psi. Do I need to add water to the system when it is cold? If so, do you recommend I turn the auto feed a quarter turn at a time to see where it goes? Thanks.
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Old 02-26-2010, 05:14 PM   #58
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That way will work.
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Old 04-04-2010, 11:45 AM   #59
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Boiler Relief Problem


how do you replace the extrol tank
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Old 04-06-2010, 02:28 PM   #60
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Boiler Relief Problem


I spin off the old one, and spin on the new one.

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