Southbend 20120SB - Manual (Page 8)

8 Printed in USA 12/02 Refrigerated Base-Self-Contained © 2002
SCHEDULED MAINTENANCE
Monthly Inspection
1. Check the evaporator drain line at both the inlet and
outlet ends to make certain that there are no
obstructions. It is not recommended to use any
chemicals in clearing a clogged drain. The preferred
method of unstopping an obstructed drain is to use
compressed air. Approximately 60 lbs. should be
sufficient. Simply remove the drain line at the
evaporator coil and attach an air-line to it.
2. With the unit in a cooling cycle, use a flashlight and
locate the refrigerant sight glass. If the compressor
has been running for three minutes there should be no
visible bubbles.
3. If bubbles are present:
a. Determine if there is a leak by using a halide or
electronic leak detector.
b. Repair leak(s).
6. To inspect the evaporator motor, first turn the unit off.
Then, remove the drain line from the evaporator pan.
Loosen the four screws that hold the shroud. Lower
the shroud and disconnect the polarized electrical
connection. With the shroud out of the cabinet,
proceed to inspect the motor mounting bolts and the
fan for cracks or excessive play.
7. Using a mild detergent and water, wipe the vinyl
gasket. Make certain to also clean under the gasket to
remove any mildew or residue.
8. Using a mild, non-abrasive detergent and warm water,
wipe the cabinet exterior. When cleaning always follow
the grain of the stainless steel to prevent scratching or
marring of the finish surface.
Annual Maintenance
1. Slide condensing unit out of the compartment and
check all refrigerant lines for leaks or fatigue. Make
certain that no exposed copper tubing is in contact with
any other metal surface. If there is contact, install an
insulating material between the tow metal components.
2. With the condensing unit out and the breaker at the
main panel “OFF”, inspect the system’s wiring. Look
for a tight fit of all connections and make certain the
that the wire restraining devices are tight. Inspect all
wires and cords, paying particular attention to nicks or
age cracks in the insulation.
3. Visually inspect the outer panel and components of the
cabinet. Check screws and bolts to make certain that
they are tight. Also, make sure that the bolts that
secure the base frame to the deck are tight.
Three Year Frequency
1. Replace the drawer gaskets. To accomplish this, it is
first necessary to remove all products from the
refrigerated compartment to avoid spoilage. Open the
drawers and remove the old gasket. The gaskets snap
in and out of a channel on the back side of the door.
Clean the track thoroughly. Replace the old gasket
with the new one by snapping it into place.
2. Inspect all motors and shafts for both noise and wear.
If they show age, replace them.
3. With the main power off, remove the condensing unit
from its compartment and inspect all wiring. Also,
remove the cover from the controls and check them to
make certain that they are operational and do not show
signs of wear.
4. Inspect the operation of the drawer slide assembly.
Make certain that the moving parts do not show any
signs of wear. Make sure that all screws are tight.
WARNING
The system should be de-energized when checking
for leaks.
i. If a leak is found on a flared fitting, it can often be
repaired by simply tightening the brass flare nut 1/4
of a turn. If tightening does not repair the leak, it
may be necessary to reflare the tubing.
ii. If a leak is found on a brazed joint, it will be
necessary to pump down the system’s refrigerant
charge to remedy the problem.
iii. To pump the refrigerant into the receiver, you must
first connect service gauges to the system at the
suction valve on the compressor and the liquid valve
on the receiver. Purge the gauges before opening
the system’s valves to avoid contamination. Run the
receiver (liquid or high pressure) valve all the way in
to stop the refrigerant from exiting the receiver.
Start the unit and allow it to run until the suction or
low-pressure gauge reads 5 lbs. When it reaches
5 lbs., de-energize the system.
iv. Once pumped down, the necessary repairs can be
made.
4 Using a mild non-abrasive detergent and soft cloth,
wipe the interior lining beginning with the top and
working down. Also, wipe the gasket and where it sits
on the cabinet exterior.
5. Remove the front air grill and unbolt and condensing
unit. Once unbolted, slide it out. The unit is capable of
being completely removed due to the extra tubing
coiled up behind the unit. With the unit de-energized,
check the condenser fan motor and make certain that it
is no loose. Inspect the fan for cracks and make sure
that it is tight on the motor.