12 | Operation
Thermo Fisher Scientific ULT Freezers
Operation
If the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may
be impaired.
Initial Start Up
To start the freezer, complete the following steps:
1. Plug the freezer into the power outlet.
2. Turn the power switch ON. You can find the switch
behind the front grille, on the left side.
3. Once the freezer is turned ON, the user interface will
begin a start up procedure. Once ready for operation, the
temperature is displayed on the screen.
Operation Overview
Once you have successfully completed the initial start up
procedures, the freezer starts operating normally and the only
actions required are:
•
Setting the operating and alarm set points.
•
Activating the CO
2
or LN
2
backup system if installed. For
instructions on backup settings and activating the
system, refer to
.
Display
The display screen below is the default screen.
Figure 4. Display
The control panel consists of the 5 touch-point buttons
located on the right side of the display.
•
Warm Alarm value
- The range of the warm alarm
temperature is –40°C to within 5°C of setpoint.
Note :
The warm alarm will be disabled for 12 hours
from a warm start condition.
•
Cold Alarm value
- The range is –99°C to within
5°C of setpoint.
Note :
A setpoint change may automatically change
the warm/cold alarm setpoints as well to maintain a
minimum 5°C separation from the control setpoint.
•
Offset value -
This is used for calibration. Range is
–10°C to +10°C. Default is 0.
Entering a positive offset value will yield a colder
cabinet temperature.
Entering a negative offset value will yield a warmer
cabinet temperature.
•
Setpoint security code –
This code is a 3-digit
.
•
Backup system type
(if backup system is installed)
– Set the type to either LN
2
or CO
2
corresponding to
the backup system that is installed.
•
Backup system setpoint
(if backup system is
installed) - This setpoint indicates the temperature at
which the backup system will begin cooling the
cabinet. It is recommended to set the backup system
setpoint at a minimum of 10°C warmer than the
control setpoint. For more information, refer to
.
1.
Alarm Bell –
This icon indicates visual and
audible alarm that accompanies various alarm
states. Pressing the alarm bell while in an alarm
state will snooze the audible alarm for
10 minutes.
2.
Plus –
Increases the value of the selected setting.
3.
Check Mark –
Saves a change to the selected
value.
4.
Minus –
Decreases the value of the selected
setting.
5.
Settings –
The settings icon represents the
various settings including:
