28 • Maintenance
MAINTENANCE
Air Curtain Velocity
Air curtain velocity is affected by stocking levels, coil frost loads, temperature, fan condition, and measurement method. Indicated velocity can
also vary from one velometer to another.
Measure air velocity at the top of the center door of the case. In a fully stocked freezer, a typical velocity reading is 400-500 feet per minute
(after the case has defrosted and pulled down to operating temperature). Air curtain velocity in a partially packed case is significantly lower
because more air exits through the rear duct.
Cleaning
Although each Zero Zone display case is thoroughly cleaned before shipping, the cases should be thoroughly cleaned again before start-up and
routinely thereafter to maintain a clean appearance. With just a few minutes of cleaning each week, the case will remain in top condition.
1. Do not use high-pressure water or steam to clean the interior or any components.
2. Do not wash fan motors. A damp cloth can be used to wipe the fan motors. Cover the fan motors with a plastic bag when washing the case.
3. Wipe out the case interior using a mild detergent and warm water (never an abrasive cleaner).
4. Clean all glass doors, windowed ends, and mirrors using glass cleaner. Cleaning interior glass reduces fogging and increases visibility.
Do not use any cleaning products containing silicon for anti-fog door coating.
5. Internal components can be cleaned after removing coil covers, access panels, and sheet metal components. use a mild detergent and
warm water or a mild sanitizer.
6. If the case is equipped with a condensate pan and pump, the drain should be blocked before washing coils. Water can be removed with a
shop vacuum.
7. Coils may be cleaned with a garden hose or pails of water. If the case is equipped with a condensate pan and pump, cases should be
cleaned with a minimal amount of water so the evaporator, pump, and drain pans do not get overfilled.
8. The case drain should frequently be cleaned of debris to prevent clogging. If water is rising, check if the drain is clogged.
UNDER CASE FLOOR CLEANING (NSF)
The floor under your Zero Zone display case can be cleaned by following these steps:
1. Remove the fasteners attaching the kickplate to the case. The fasteners are accessed from the front of the unit.
2.
With the kickplates removed, remove debris from the floor.
3. Vacuum under the case to remove any dirt, debris, and dust build-up.
4.
Mop under the unit using non-abrasive floor cleaner and warm water.
5.
When finished mopping, squeegee any remaining water under the unit to the floor drains to speed up the drying process. Replace the
kickplates when the floor has dried.
MAINTENANCE
