Part number 20079, Rev 0
6
FREEZER OPERATION
After the unit is properly installed and power is applied, it will take some time before the
system is cooled down to temperature and cycling normally. You should wait 8 hours on the
first startup before beginning to add product to the unit. This ensures that the unit is installed
and operating properly before being put into service. On subsequent startups (after cleanings,
for example), this wait time can be reduced to about 4 hours. After this wait time, the unit
should be cycling in the desired temperature range. The units are calibrated before leaving the
factory, so no adjustment should be necessary.
Loading the units will again cause temperature to rise as the warmer product is introduced into
the compartment. If a large amount of product is to be introduced, it is a good idea to do it in
stages, allowing several hours between stages to allow temperature to stabilize again before
introducing additional warm product. This will minimize the temperature transient while
loading. Other tips for successful loading include:
-Leave about 2-3 inches of free space along the back and sides of the unit to allow for proper
air flow and, therefore, more even cooling of the product.
-When loading the top shelf, avoid blocking the evaporator fan(s) (if installed). There should
be at least 4 inches of clearance below the fan(s) to allow proper air flow.
-Do not overload the unit. Recommended maximum load is about 75% of the chamber
volume. Additionally, the load should be distributed evenly from top to bottom and side to
side for best results.
These freezers come with 5 interior doors (one for each shelf) to help minimize the
temperature transients resulting from opening the main door. You should still minimize the
time the freezer door is open. On top of letting the cold air out, you are also letting warm,
moist air in which will result in the buildup of more frost in the unit.
Model ABT-3020AP has an auto-defrost feature. Every 6 hours, it will go into a defrost cycle to
remove frost build-up. During this cycle, which can last up to 25 minutes, the compressor is
turned off and defrost heaters are turned on in the evaporator section. This will cause a
temperature transient which will be seen in air temperature inside the unit but should not
significantly affect product temperatures. The other models need to be periodically defrosted.
This procedure is located in the Maintenance and Cleaning section of this manual.
Remember that the units are calibrated to the desired temperature range before leaving the
factory. We also do extensive testing to ensure that these temperatures will result in product
temperatures in the desired band. There should be no need to adjust the temperature control
on these units, but if it is necessary, they can be adjusted using the manual thermostat on the
back of the unit.
It is STRONGLY RECOMMENDED that you contact the manufacturer’s Technical Support
Department prior to performing any temperature adjustments to ensure the adjustment is
necessary and, if so, it is performed correctly.
