Not worked on one of these so checked my computer... the boiler doesn't seem to have an expansion vessel so ain't pressurised...have I got the right boiler? That being the case you obviously have the system pressurised anyway. You need to go to the pressure vessel, hold open the PRV and attach a foot pump to the schrader valve on the vessel and pump the pressure to whatever the data badge says...standard is about 1 bar, bigger ones are 3,5bar.
Hope I ain't completely missed the mark here
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