Ultra Low Temperature Freezers Maintenance and Troubleshooting | 33
Battery Maintenance
The freezer monitors the voltage status of the battery daily
and indicates a battery failure via visual and auditory warning.
Replace the battery as indicated by system warnings 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. Be sure to reset the battery
replacement timer via the user interface whenever the battery
is replaced.
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 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
(see below). 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.
Battery Specification
Rechargeable sealed lead-acid battery, 12 V, 7.0 Amp Hr.
Replacement batteries can be purchased directly from
Thermo Fisher Scientific (part number 400159).
Figure 47. Battery Specification
Maintenance Schedule
Regular maintenance is important to keep the unit working
properly. Inspect/Clean as directed in the table below.
Item Interval
Defrost
Defrost the freezer once per year or
whenever the ice build exceeds
3/8 inches (0.95 cm).
Gasket
Periodically check the gaskets around
the door for punctures or tears.
Periodically clean the ice-build up
around the gasket.
Filter
Clean the condenser filter(s) every 2 to
3 months.
Condenser
Clean every 6 months; more often if the
laboratory area is dusty.
Battery
Replace the battery as indicated by
system warnings 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.
Undercarriage
lighting
(optional)
Every 2 to 3 months, clean any dust or
debris that has accumulated on the
surface of the lighting housing.
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