I've got the above mentioned boiler, inherited in the flat I bought. The manual says that it's either a TurboMax Plus 824.2E, 828/2E or a Thermo Compact 615/2E, 620E, 624/2E, 628/2E.
I believe it's the Thermo Compact because I've looked at Youtube vids for pressurising TurboMax's and it...