Our local dist has no data quit York...some other tech put in off brand pressure switches, (non adjustable) last year...have to allow air to bi-pass grommet on combustion chamber to get ignition...calls for 1.5in water col on one switch and .60 on the other, but no manual or print out to see how tubing was before last year...I want to restore it to proper condition....Where do I get a copy??? fax # is 765-741-5877 or e-mail to: shawphillip@sbcglobal.net thanks. serial # ENCP039481