Nor-Lake Undercounter Laboratory & Pharmacy Refrigerators & Freezers - Manual (Page 4)

COLD WALL MODELS
The cold wall freezer models employ evaporator tubing embedded in the sidewalls, back, and top of
the unit. During the refrigeration process, heat is removed through the evaporator tubing and
expelled through the condensing unit. Because of the cold wall design, it will be necessary to
occasionally manually defrost the freezer models. First, remove all the contents and relocate to
another freezer. Next, unplug the unit and open the door. Wipe the cabinet dry when defrosting is
complete. Caution: Never use a sharp object to remove the frost build-up.
Cold Control Adjustment
The temperature control knob is located behind the lower front panel. To make a small increase or
decrease in the internal cabinet temperature, rotate the control knob as needed.
MAINTENANCE
PERIODIC CLEANING
Beginning with the initial installation, the interior surfaces of the cabinet should be periodically wiped
down with a solution of warm water and baking soda. This solution will remove any odors from
spillage that may have occurred. The exterior of the cabinet should also be cleaned frequently with a
commercial grade of glass cleaner. Caution: Never use an abrasive or alkaline solution to clean
these units. Wipe dry after cleaning.
Observe all Warning Labels. Disconnect power supply to eliminate electrical shock and
injury from moving parts when servicing equipment.
Important: Monthly cleaning of the condenser coil located at the bottom of the cabinet should be
done. This cleaning will aid the heat transfer characteristics of the refrigeration system and increase
its efficiency. Dust, dirt, and lint will tend to accumulate on the fins of the condensing unit. This
obstruction will affect the flow of air through the condenser, thereby lowering the efficiency of the
system. A wire brush or a brush with stiff bristles can be used to loosen these particles that are
attached to the fins so that they may be removed with a vacuum cleaner. Failure to keep the
condenser coil clean and clear of obstructions could result in temperature loss and
damage to the compressor.
These units are equipped with a vaporizer pan that is located in the rear base of the cabinet and can
be accessed from the back of the cabinet. The pan should be cleaned routinely to prevent mold or
bacteria buildup. To clean the pan, remove the two hex head screws from the bracket holding the
pan in place. Carefully remove the pan, taking care no to break the drain tube going into the pan.
Remove any water and particles that may be in the pan. Clean thoroughly. Return the pan to its
position, making sure the drain tube is properly placed in the pan. Reattach the bracket.
All moving parts have been permanently lubricated and will generally require no maintenance.