Re: New boiler system over-pressure


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Posted by dale van aken on December 28, 1997 at 05:40:22:

In Reply to: New boiler system over-pressure posted by Dale Van Aken on December 27, 1997 at 12:04:28:

Thanks for you ideas, Joe. This is a new house - all the piping is 3/4 copper. The water supply is a well set at 30-50#. When I looked at the Amtrol literature, they suggest the Model 60 for 150,000 to 250,000 BTU. Since I am well in this range, it seems to be sized right. Also, the HW tank is always at temparature (it may change a few degrees or so, but when I stabilize the system, it should not increase its temp much to create thermal expansion. I am wondering if the large circs (Taco 009 and 011) could be creatins short pockets of low pressure on their intake side when they kick on, especially the heating, since it is feeding only a 3/4 pipe and would have some resistance on its pressure side. With short pockets of low pressure, it would allow the watts pressure valve to slip in more and more cold water, eventually too much. Sound plausible?



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