Yamato Scientific CLS600 Cool Line - Manual (Page 32)

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Operation Method
Addition Time Function
Displays the time length that the controller is plugged.
① Press SUB MENU key for 4 seconds.
Then by pressing SUB MENU key, select the character "Accm" which
means addition time, and press RUN/STOP key.
② The time length that the controller is plugged is displayed at the
setting temperature screen.
Press SUB MENU key for a few seconds. The screen will returns to
the initial screen.