2.3 First Run (Also required whenever the freezer is turned off or moved)
Before activating the unit for the first time, ensure that there’s no object other than the shelves inside the
freezer.
Turn on the power switch. The controller will light up. The first stage compressor gets the power and starts
working. When the heat exchanger inside the freezer becomes cold enough and reaches a predetermined
temperature, the second stage compressor starts. The unit continues to operate until it reaches the set
temperature.
Lexicon™ Ultra-Low Temperature freezers have an operating temperature of -50 °C to -86 °C, depending on
the ambient temperature. The freezer is shipped from the factory with a temperature set point of -80 °C. Refer
to section 3.2 to change temperature setting.
ULTF S-series controller has 2 switches for alarms located behind the right bottom door.
Once the unit reaches set point temperature, open the outer and the inner doors to load in half of the racks.
In the process of doing so, the freezer temperature is expected to warm up. Let the unit recover to the set
temperature then load in the rest of the racks.
If the freezer does not require any racks, let the unit run at set point for at least 48 hours for observation
before placing any products inside the unit.
2.4 Disclaimer
The performance and safety of the freezer, while rigorously evaluated at the factory, cannot be guaranteed
after transit and installation. Therefore the on-site testing is always recommended.
unit runs. (Warning: Make sure the scheduled maintenance for
PF battery is carried out; refer to chapter 4, to ensure the battery
stays charged when the unit is on).
On the other hand, high temperature alarm switch should
remain off during initial start-up run in order to avoid
nuisance alarm beeping during pull down. It should only be
turned on once the unit has reached the temperature set
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