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Old 02-20-2010, 07:18 PM   #16
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Boiler Relief Problem


Drop the pressure back down to 15 lbs, shut the valve to the feeder and see it the pressure creeps up. If it does then change the tank. I assume that you have set the pressure int the amtrol 30 to around 12 lbs, yes?

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Old 02-20-2010, 07:48 PM   #17
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NHMaster- Is it safe to have the dw feed off for a day?

Last edited by dgr68; 02-20-2010 at 07:50 PM.
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Old 02-20-2010, 09:12 PM   #18
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It's safe to have it off forever. It's a closed system. If it does not leak you will not loose pressure
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Old 02-21-2010, 06:26 AM   #19
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NH- That's what I would assume but some other posters have thrown up their stop signs on that idea. What town are you in?
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Old 02-21-2010, 06:33 AM   #20
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Furd/NJ:

Do you think this is a fair statement- from another poster on a different site?

"dgr68, there's several obvious errors in this installation, in this particular forum I'm not allowed to get into it, I hope you didn't pay too much for this."

"Though the piping and soldering looks decent, many of the parts are installed in the wrong location, and incorrectly, this is either a DIY install, or a very inexperienced contractor."
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Old 02-21-2010, 07:17 AM   #21
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The only thing I see wrong is the BFP should have been installed before the water feed but that will not make any difference at all in the operation of the unit. Other than that the primary piping looks good.
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Old 02-21-2010, 08:02 AM   #22
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Originally Posted by NHMaster View Post
The only thing I see wrong is the BFP should have been installed before the water feed but that will not make any difference at all in the operation of the unit. Other than that the primary piping looks good.
I think the BFP should be the first in line after the shutoff valve.
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Old 02-21-2010, 08:59 AM   #23
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I think the BFP should be the first in line after the shutoff valve.
Yes, normally both Watts and Taco package the feeder and BFP as one unit with the BFP 1st in line. But if you think about it, it really shouldn't make any difference.
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Old 02-21-2010, 09:26 AM   #24
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Yes, normally both Watts and Taco package the feeder and BFP as one unit with the BFP 1st in line. But if you think about it, it really shouldn't make any difference.
It can cause failure of the PRV sooner then normal.
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Old 02-21-2010, 12:37 PM   #25
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OK, how? I only ask because the auto feed is only going to feed the system once and if nothing leaks it should never have to feed again. There is no evaporation going on in a closed system.
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Old 02-21-2010, 02:04 PM   #26
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OK, how? I only ask because the auto feed is only going to feed the system once and if nothing leaks it should never have to feed again. There is no evaporation going on in a closed system.
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.
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Old 02-21-2010, 02:33 PM   #27
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The Xtrol tank is properly sized and the feeder is installed in the proper location there will be no increase in pressure as the boiler heats up. That is what the tank is for.
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Old 02-21-2010, 03:29 PM   #28
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The Xtrol tank is properly sized and the feeder is installed in the proper location there will be no increase in pressure as the boiler heats up. That is what the tank is for.
On a system that has 40 gallons of water in it. In order to keep the pressure increase to only PSIG from a fill pressure of 12PSIG, and an average operating temp of 180F, the expansion tank would need a volume of 2.96 cubic foot.

Allow it to expand to 18PSIG, and you only need .59 cubic foot of volume.

The expansion tank isn't to prevent any pressure increase. Its to prevent excessive pressure increase as the water volume increases. In order for that to happen. The air in the tank must be compressed. Which means a pressure increase. Or the water wouldn't go into the tank.

A Extrol 30, is only a little over 1 cubic foot of volume. And is the proper size for many systems simular to the OPs.
But, even a 60 on his system will have pressure increase.
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Old 02-21-2010, 05:39 PM   #29
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We are talking about the return side of the system that should stay 12 psi constant?? Right or wrong??

The boiler supply side can go anywhere it wants right or wrong please advise.??
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Old 02-21-2010, 05:46 PM   #30
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We are talking about the return side of the system that should stay 12 psi constant?? Right or wrong??

The boiler supply side can go anywhere it wants right or wrong please advise.??
When you have a system with 40 gallons of water in it. When that water is heated, it will expand and increase system pressure. How much depends on the size of the expansion tank.

Water expansion from being heated, and pressure increase from the circulator are 2 different forms of pressure.

The point of the expansions tanks attachment, is considered the point of no pressure change during circulator operation.

However. if the water temp started at 60F. And the water was heated by the boiler to 180F. The pressure would increase since the volume of water in the system increased.

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