Thermo Fisher Scientific ULT Freezers
Maintenance | 15
Maintenance
Cleaning the Condenser
Clean the condenser at least every six months; more often if
the laboratory area is dusty.
To clean the condenser, complete the following steps:
1. Pull the grille door open.
2. Vacuum the condenser.
3. Inspect the filter cleanliness and clean as required.
4. Close the grille door.
Cleaning the Condenser
Filter
Clean the condenser filters every two or three months.
1. Pull the grille door open.
2. Remove the filter.
3. Shake the filter to remove loose dust, rinse the filters in
clean water, shake the excess water from the filter, and
replace the filter.
4. Close the grille door.
Gasket Maintenance
Periodically check the gaskets around the door for punctures
or tears. Leaks are indicated by a streak of frost which forms
at the point of gasket failure. Make sure that the cabinet is
level (refer
for leveling information).
Keep the door gaskets clean and frost free by wiping gently
with a soft cloth.
Defrosting the Freezer
Defrost the freezer once per year or whenever the ice buildup
exceeds 3/8”. To defrost, complete the following steps:
1. Remove all products and place in another ULT freezer.
2. Turn off the freezer.
3. Open the outer door and all inner doors.
4. Let the freezer stand with doors open for at least 24
hours. This allows both the interior and foamed
refrigeration 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.
7. Clean the exterior with any common household cleaner.
8. Close the doors, restart the freezer and reload. Refer
to follow the instructions.
Battery Maintenance
The freezer monitors the voltage status of the battery daily
and indicates the battery’s voltage via visual and auditory
alarm. Replace the battery as indicated by system alarms or
as necessary per individual status evaluation. Check the
battery connections regularly. Although not required, annual
battery replacement is recommended to ensure proper
battery status in the event of power failure.
For safety, it is recommended to power off the unit and
disconnect it from the power source before replacing the
battery. Battery terminals are color coded in red and black.
Ensure the corresponding colored wires are connected to the
matching color terminals on the battery. The battery is
installed with terminals oriented toward the condenser
compartment or hinge side of the freezer’s outer door (refer
). With proper installation, the red wire
should be connected to the rear battery (positive) terminal and
the black wire to the front (common) terminal.
Failure to properly connect the battery can damage electrical
components and potentially hinder normal operation of the
freezer. Consult a certified service technician if there are any
questions or concerns about battery maintenance.
WARNING:
Unauthorized repair of your freezer
will invalidate your warranty. Contact Technical
Service. See
for phone
numbers.
CAUTION:
Maintenance should only be
performed by trained personnel.
