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Re: Normal Boiler Pressure Range

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Posted by Ziad on March 16, 2008 at 09:44:47:

In Reply to: Re: Normal Boiler Pressure Range posted by Steve R. on March 14, 2008 at 23:25:50:

: So when you say the expansion tank is on the "supply line" are you referring to the smaller (1/2" ?) line that fills the boiler system, or the supply that is actually the "hot" water pipe that comes from the boiler.

I was referring to the hot water pipe that comes from the boiler, we mounted the expansion tank as specified by the diagram from Flexcon.

: Typically, we refer to that as the supply and the pipe returning the water to the boiler the return.

: The expansion tank must be connected with the fill valve/pressure reducing valve/backflow preventer/ air seperator BEFORE it tee's into the boiler system.

I put up some pictures to show my setup: http://picasaweb.google.com/ziad.ss/Boiler . It is nothing as neat as what you have but I have little space and an ancient boiler. I colored the 12psi fresh water feed with blue. Blue circles, point to pressure reducing valve and backflow preventer down by where the fresh water feed line meet the circulator pump.

Green shows some return lines to the boiler. Red shows some of the supply lines and on one of the pictures, you can see the green expansion tank.

The gray expansion tank, was mounted temporarily on the line that used to feed the old steel expansion tank. I put it up to see if my pressure problems were because I just needed more expansion volume. With the setup shown here, the pressure reaches a max of 20psi when the boiler is run continuously for about three hours; significantly more than I typically need to warm the house.

: See if these pictures help explain:
: http://s28.photobucket.com/albums/c220/twotyerfryer/?action=view¤t=PalmerBoiler3.jpg
: http://s28.photobucket.com/albums/c220/twotyerfryer/?action=view¤t=PalmerBoiler2.jpg
: I tagged the photos so you can identify each part. Let me know if this helps.

The pictures and tagging are very helpful. Thanks.

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