tuning a pstat

I've a Nuova Simonelli Personal a friend gave me. It looks to be in pretty
good shape & when I bench tested it everything worked - sort of.

Besides the usual suspects; leaks & crud build up, the first thing I noticed
was that if I aimed for 1.1 - 1.3 boiler pressure the water in the Styrofoam
cup never exceeds 184F. If I want it to reach 195F I have to set the
pressure at 1.6 bar. I understand that these gauges are stone-age technology
but could it be that far off? Also, at 1.6 bar the temp is 196F for the
flush, 193 & 191 for the next two 1.5 ounce pulls, then drops off quickly
for subsequent pulls.

I would've thought that, given the boiler size, incoming cold water wouldn't
drop the HX temps that fast. If HX's are that unstable where are the
advantages over a single boiler if you still can't pull shots consecutively?
Is it considered to be enough of an advantage being able to steam & brew at
the same time?
--
Robert (Hmmmmmm!) Harmon
http://tinyurl.com/pou2y
http://tinyurl.com/psfob
http://tinyurl.com/fkd6r


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