32 | Backup System (Optional) Ultra Low Temperature Freezers
Note: The top of the nipple has a hex configuration, allowing
for use of a wrench when the nut is pulled down.
• Add washer to nipple inside of nut (unless CO
2
supply has a built in washer).
Note: Small raised area of washer fits into groove of nipple.
The washer will feel snug when trying to shift side to side on
nipple. The washers are designed for a limited number of
attachments/disconnections from the supply and may wear
overtime. If washer appears worn and causes CO
2
leakage,
replace washer (Part Number 45705H03).
• Wrench tighten the supply nut to the supply.
•For LN2:
• Attach the fitting to the supply and wrench tighten.
Start Up
To activate the backup system:
1. Follow the instructions in Section 8 to turn on the freezer
and set temperature and alarm set points.
2. Select the backup type and backup set point on the
Backup Setting Screen below, which can be accessed
through the Controls option in the Settings tab
(refer Figure 35).
Figure 72. Backup System Settings Screen
3. Press the Save button to save the changes made.
Operation
When the backup system is in operation, the parameters can
be viewed and configured on the settings screen.
Once the backup system has been activated, it can be tested
by pressing the Test button. The system will inject as long as
the button is being pressed.
The backup system can run for a minimum of 24 hours on
battery power.
On average, a backup system in operation uses 8 to 10 lbs.
per hour of CO
2
(3.6 to 4.5 L/hr) or LN
2
(4.5 to 5.6 L/hr) at an
ambient temperature of 25°C.
Note: Do not twist, torque, or subject the
flexible hose to sharp bends. Doing so may
shorten the life of the hose.
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