I'd love to see that manual -- I was never able to track one down for my 1-group Club. I don't even understand how someone would go about adjusting pressure at the group; that strikes me as a little bizarre. To adjust boiler pressure and bring the group-water temp down, you need to adjust the pressurestat. On mine, looking at the front of the machine, the Sirai Pressurestat is found just behind the left-hand panel. I take the left side panel off and see it as it appears in the attached photo (circled in green).
This was hard for me to recognize because in 1-group Contis, the 'stat is mounted sideways. As such, one cannot slide the cover off in order to adjust it. Instead there's a hole drilled through the cover, allowing screwdriver access to twist the adjustment screw. I needed a decently long-necked flat-head.
To decrease boiler pressure and lower group-water temp, twist clockwise. To increase boiler pressure and raise group-water heat, twist counterclockwise.
(Note: This does run contrary to our usual assumption of right=up / left=down, which we learn from stereo volume knobs, gas range knobs, etc. In this case, right = pressure down, left = pressure up.)
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