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.)
Here's a closer look at the holes on the Pressurestat.
Needless to say, the machine should be fully powered down and unplugged while making this adjustment. No need to let it cool, just cut the electricity -- just in case.
When making the adjustment, it might take a few full turns of the screw, but generally not more than that. I kept mine set at about 1.0/1.1 at the top of its heat cycle.
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