Nor-Lake NOVA Refrigerators and Freezers - Manual (Page 3)

3 06/11 Rev. B 127717
REFRIGERATORS
During the operation of a refrigerator unit, frost will periodically form on the coil surface. Each
time the compressor cycles "off", the evaporator fans will continue to run, which will keep the
internal temperature uniform and at the same time remove any frost build up on the coil. The
water produced will collect in the unit cooler drain pan and travel down the drain tube to the
condensate vaporizer.
FREEZERS
After shutting the door on freezer models, a short amount of time must be allowed before the
door can be reopened. This is due to the tight seal maintained between the door and the
cabinet. Waiting a few moments for the pressure to equalize permits the door to be opened
easily.
A positive defrost is required to remove frost from the coil in freezer models. This is
accomplished by energizing heaters during the defrost cycle that are positioned on the coil
surface. The programmable controller is factory set to allow four defrosts per day.
As the preset defrost time is reached, the controller automatically terminates the refrigeration
process by turning off the condensing unit and unit cooler fan motors, and energizes the
defrost heaters. As the coil temperature increases, the frost begins to melt producing water
which runs down the coil to the unit cooler drain pan and exits through the drain tube to the
vaporizer. After all the frost has been removed and the coil temperature reaches
approximately 50°F [10ºC], the defrost is terminated through the action of the defrost
termination control located on the unit cooler, and the refrigeration process resumes. In order
to insure that any excess water remaining on the coil is not sprayed into the cabinet interior,
and all heat generated by the defrost is removed, the unit cooler fans will not operate until
the coil temperature reaches approximately 25°F [-4ºC].
Note:
Running a cold wall model freezer in an unconditioned environment may result in frost
build-up inside the cabinet.
GENERAL 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 has occurred. The exterior of the cabinet should also be cleaned
frequently with a commercial grade of glass cleaner.
Monthly cleaning of the condenser will aid the heat transfer characteristics of the refrigeration
system and increase its efficiency. To accomplish this, remove the cover panel from the
cabinet and use a wire brush to loosen any dirt particles that are attached to the fins. Use a
vacuum cleaner to remove the loosened particles. Failure to keep the condenser coil clean
and clear of obstructions could result in temperature loss and damage to the
compressor.
The shelving and pilasters should be periodically cleaned. The shelving should be removed
from the cabinet interior and washed with warm water and mild detergent using a soft bristle
brush or may be washed in a dishwasher large enough to accommodate the shelving size.
Pilasters may be removed from the cabinet interior by using a Philips screwdriver. Unscrew the
Philips head screws securing the pilasters to the cabinet interior walls. Retain the screws in a