14 | Operation
Thermo Fisher Scientific ULT Freezers
Power Down
To power down the ULT, first turn the breaker switch, located
behind the front grille, to the off position. Once the switch is in
the off position, the display will show “OFF” followed by “YES”
and then “NO” in 2 second intervals. The checkmark will also
be illuminated while “YES” and “NO” are showing. Press the
checkmark while “YES” is showing. With a flashing “YES”, you
are required to confirm by pressing the checkmark button a
second time. Power down will then be complete.
If the checkmark button is pressed while “NO” is illuminated
or if no action is taken for 5 minutes, this is interpreted as a
power failure. In this case, the user interface will stay on (using
battery power only) and an audible alarm will sound to
indicate power failure. If installed, the backup system will
remain active and inject per the backup system settings.
