Tuttnauer 1730EK, Technical Manual

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9.24 Emergency Door Opening
Caution!
Before starting, disconnect the instrument from the power source and
ensure that there is no pressure in the autoclave.
In order to facilitate the initial installation, the door locking position is
taped in this retracted position at the factory. On completion of all
installation activities this tape must be removed. If for any reason the
door locking mechanism is permanently locked, it is possible to open the
door and provide access for eventual repairs to the locking mechanism.
The swing bolt has a drilled opening located in the lock catch. By
pushing the piston back with a 2mm. pin, the swing bolt may be turned
another 3/4 turn until the position catches again. Repeat these operations
until the bolt can be swung away and the door opened.