Maintenance and Troubleshooting
20 Installation and Operation Manual
Thermo Scientific Cryogenic Storage Freezers
7.3 Defrosting the
Freezer
Defrost the freezer once a year or whenever the ice buildup exceeds 1/4”.
To defrost, complete the following steps:
1. Remove all products and place in another freezer.
2. Turn off the freezer.
3. Open the outer lid and sub-lids.
4. Let the freezer stand with the lids open for at least 24 hours. This allows
both the interior and foamed refrigerant system to warm to room
temperature.
5. Dispose of the ice and wipe out any water standing in the bottom of the
cabinet.
6. If there is freezer odor, wash the interior with a solution of baking soda
and warm water. Clean the exterior with any common household
cleaner.
7. Reinstall the sub-lids, close the lid, restart the freezer and reload.
7.4 Alarm Battery
Maintenance
Have a technician check the condition of the alarm battery at least once a
year.
To replace the alarm battery, complete the following steps:
1. Remove the front grill. The alarm battery is located directly behind the
grill. The terminals are the “push on” type.
2. Grasp the terminal with pliers and work it gently back and forth while
pulling it off. The fittings are tight.
3. Remove the battery and put the new battery in place.
Note:
You may have to cut a strip of silicone rubber in order to remove the
battery.
4. Connect the battery terminals and replace the front grill.
