13. CHANGE SPRING PRELOAD (ONLY FOR SMARTPRO S)
ATTENTION!!! This operation must be performed with the utmost caution!!!!
ATTENTION!!! NEVER loosen or disassemble the arm from the door before having reassembled
the spring restraint screw!!!!
1. Realign the red reference notches (when door in closed position they are not aligned, open the door until
they match).
2. Tighten the screw paying attention it will fit in the hole of the toothed gear so as to constrain again the
spring (realigning the notches the holes must fit together).
3. Depending on the selected arm follow the instruction described above
Ba aware that:
Each segment of teeth of the arm connexion correspond to 20° arm rotation and a reduction
(if you follow the opening direction) / increase (if you go opposite the opening direction)
of spring preload of 0,8N/m.
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