28 | Backup System (Optional) Ultra Low Temperature Freezers
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 LN
2
:
• Attach the fitting to the supply and wrench tighten.
Start Up
To activate the backup system:
1. Follow instructions in the Startup section to turn on the
freezer and set temperature and warning setpoints.
2. Set backup setpoint or perform test injection on the
Backup System screen below, which can be accessed
through the Controls option in the Settings tab. Details on
test injections are covered in Operation section.
(Refer to Figure 20).
3. To change the backup system type contact service.
Figure 44. Backup System Settings Screen
4. 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.
This backup system can be tested by pressing the Test
Injection button. The system will inject for approximately
10 seconds. During this test, injection can be stopped by
pressing the button again. After a test injection has
completed, the button will become inactive for approximately
50 seconds to prevent excessive cooling.
The backup system will last for a minimum of 24 hours on
battery power given proper battery maintenance is followed
detailed in Battery Maintenance section.
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.
CAUTION: 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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