Key functionality (Tab. 2)
When pressed during operation, it changes the setting of the X 1 or X 10 probes.
When pressed at the end of the programming phase, it allows to access the
programming of the regeneration cycle phases.
It allows to access the programming functions of the working parameters.
When pressed during programming or time setting, it allows to increase the digit
blinking on the display.
When pressed during operation, it allows to display the residual volume.
It allows to change the regeneration start mode.
It allows to activate the regeneration manually.
During programming, it allows to quit without saving the parameter being
modified when the key is pressed.
During regeneration it ends it.
Placed below the 6 keys, in the middle between Advance and Volume/Clock, it
allows to start a test regeneration. When pressed during some programming
phases, it zeroes the digit blinking on the display.