Nor-Lake General Purpose Lab Freezer - Manual (Page 4)

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12/10 Rev. B 138707
CAUTION: Freezer must be unplugged to avoid electrical hazard from power source when
defrosting the unit.
On upright models with a defrost drain (Figure 1), remove the drain plug on the interior floor of the
freezer by pulling straight out. To access the external drain tube on models with the base panel,
remove the two screws from the base panel. Locate the drain tube near the left center under the
freezer. Place a shallow pan under the drain tube (pan not supplied). Defrost water will run out.
Check the pan occasionally to ensure that the drain water does not overflow. A ½ inch garden hose
adapter cab be used to drain the freezer directly into a floor drain. If the model used is not equipped
with an adapter, one can be purchased at most hardware stores. Replace the drain plug when
defrosting and cleaning are complete. If the drain is left unplugged, warm air may enter the freezer.
Once all the frost has melted, wipe out the unit with a dry cloth, close the door and reconnect the
unit to power. Allow four hours for the unit to return to proper operating temperature prior to
reloading with product.
MAINTENANCE SERVICE AND ANALYSIS GUIDE
MALFUNCTION POSSIBLE CAUSE SOLUTION
Freezer does not 1. Freezer plugged into a 1. Use another circuit.
run. ground fault interrupt circuit.
2. Temperature control is in the 2. See Temperature Control Section.
OFF position.
3. Fuse blown or tripped circuit 3. Check/replace fuse with a 15A time delay
breaker. fuse. Reset circuit breaker
Freezer runs too much 1. Freezer recently dis- 1. 4 hours required for freezer cool down.
or too long. connected for a lengthy period.
2. Large amount of product 2. Warm product will cause freezer to run
recently stored. more until desired temperature is reached.
3. Doors opened too frequently 3. Open doors less often.
or too long.
4. Freezer door may be 4. Freezer may not be level.
slightly open.
5. Temperature control set too cold. 5. Reset temperature control.
6. Freezer gasket is dirty, worn,
6. Clean or replace gasket.
cracked or poorly fitted.
Vibrating or rattling noise.
1. Freezer not level. 1. Re-level the freezer as specified in the
INSTALLATION section.
2. Freezer is touching the wall. 2. Move the freezer away from the wall.
Moisture forms on freezer
1. Weather is hot and humid. 1. This is normal.
interior. 2. Door not seating properly. 2. Re-level the freezer.
3. Door kept open too long or too 3. Open door less often.
frequently.
Moisture forms on freezer
1. Door may not be sealing 1. Re-level the freezer.
exterior. properly.
Door will not close.
1. Freezer is not level. 1. Re-level the freezer.
Light bulb will not turn on.
1. Light bulb burned out. 1. Replace light bulb with a new bulb of the
Same wattage.
2. No electric current reaching the 2. Ensure freezer is plugged into power
Freezer. receptacle.
3. Defective light bulb holder or 3. Contact a service technician.
Light switch.