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Posted by HeatPro on September 12, 2009 at 12:06:47:
In Reply to: Hartford loop posted by mike on September 12, 2009 at 07:24:32:
Neither.
As I used to say in IBR classes -
the Installation and Operation booklet that comes in the packaging with boilers is not only
to be used to keep the knee clean from the floor dirt when assembling.
To CYA in warranty, I recommend following the installation instructions:
http://www.williamson-thermoflo.com/pdf_files/550-110-738.pdf
to the letter of paragraph 2 and to the drawing
Page 9 section 3 Figure 5
the instructions also warn to install according to:
"Figure 5 and Table 5. Pipe exactly as shown"
which shows an elbow and close nipple entering the Hartford 1-1/2" equalizer with the top of the nipple two inches below the water line.
Nobody other than the engineers who made the drawing are as responsible, as the field engineers will see the results of installations of that particular make and model boiler, to make the manuals conform to satisfactory installation to prevent further problems.
IMO, keeping the el 2" below the water line allows dancing with no potential slap or bang. The short distance of the close nipple and tee prevents any longer horizontal pipe area that can allow pipe slap or bang.
Although that is a preference, it in no way supercedes the installation instructions which really determines code interpretation that can only be superceded by the local inspectors.