3 - 1
Section 3 - Maintenance
Disconnect the unit from power before beginning
any installation or service procedure.
Do not turn the refrigerator ON within 5 minutes
of turning it off. The compressor may not operate
properly without this 5 minute interval. This also
protects the compressor from excessive pressure
build-up.
3.1 Defrosting the Unit
a. Cycle Defrost
The defrost heater cycles automatically to clear any frost
accumulation on the refrigeration coils. This has no effect on
the chamber temperature.
b. Forced Defrost
If the ambient humidity is high or a large amount of damp
product is being stored in the chamber, the cycle defrost may
not be sufficient to remove all the frost from the refrigeration
coils and an automatic defrost function is initiated. This func-
tion is activated by a sensor located on the evaporator. When
this defrost function occurs, the current chamber temperature
and “dF” flashes alternately on the
TEMPERATURE
display.
The compressor will stop and a heater will be activated. When
the cycle is complete, normal operation resumes. The chamber
temperature may rise as much as 10° during this defrost cycle.
3.2 Cleaning Evaporation Tray and Condenser Filter
(Condenser, if applicable)
Clean the drain evaporation tray and condenser filter (con-
denser, if applicable) once a month.
a. Cleaning the Evaporation Tray
1. Remove the two screws securing the bottom front unit
cover.
2. Clean the cover.
3. Remove and empty the evaporation tray.
4. Clean the tray using a mild detergent and warm water.
Do not use hot or boiling water. Rinse the tray thorough-
ly and return it to the unit. Install the cover.
b. Cleaning the Condenser (3684, 3686)
Clean the condenser using a vacuum sweeper.
c. Cleaning the Condenser Filter (3688)
To prevent dust from clogging the condenser, a filter is
installed to the right of the evaporation tray.
1. Remove the bottom front cover, then hold the filter by
the leading edge and slide it to the left. Clean with
water, dry completely and return it to its original posi-
tion.
2. After cleaning both the evaporation tray and the con-
denser filter, secure the bottom front cover by aligning
the three pins at the top of the cover and installing the
two screws at the bottom.
3.3 Cleaning the Unit
Never splash or drip water on the outside of the
unit, as water can cause malfunctioning of the
electronic components.
Do not clean the unit with brushes, acid, benzene,
thinner, powdered soap, cleanser or hot water.
These agents can damage the cabinet’s finish and
any plastic or rubber components.
A dry cloth can be used to clean all areas of the unit
including the shelves and drawers. Any condensation that
forms on the front glass or frame may be wiped away.
Be sure to rinse completely with a clean cloth and water, if
using a mild detergent.
3.4 Replacing the Fluorescent Light
To replace the fluorescent light bulb, follow the procedure
below.
1. Turn the control panel light switch and power switch off.
Unplug the unit.
2. Remove all shelves from the left side of the chamber.
3. Grasp the light bulb assembly and pull it from the hold-
ing brackets.
4. Roll off the rubber connector protectors from each end
of the bulb.
5. Gently remove the bulb from the cover.
6. After placing the new bulb into the cover, reinstall the
rubber protectors.
7. Return the fluorescent light bulb assembly to its original
position.
Model 3680 Series ____________________________________________________________________________Maintenance
