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SECTION 4
MAINTENANCE INSTRUCTIONS
4.1 FREEZER ADJUSTMENT
This section is intended to provide maintenance personnel
with a general understanding of the freezer adjustments. It
is recommended that any adjustments in this section be
made by a qualified person.
4.2 PRODUCT TEMPERATURE ADJUSTMENT
A potentiometer is used to control the product tempera-
ture. To change the temperature of the product, follow the
steps below:
A. Remove the two screws under each corner of the
header display sign, then pull sign out and down.
NOTE
Removal of inside electrical box cover (if present) is not
necessary when making temperature adjustments.
B. Use a screw driver to make desired adjustment. A
label near the potentiometer will give complete in-
structions. (See Fig. 20)
Figure 20. Potentiometer
Figure 21. Belt Adjustment (Model 237 Shown)
D. If an adjustment is necessary, loosen jam nut on
motor adjustment plate. Then tighten or loosen ad-
justing nut for proper tension and tighten jam nut. On
Model 237R you must loosen the four motor plate
retaining nuts.
NOTE
Belt life will be increased if new drive belts are tight-
ened after two or three weeks of operation.
4.4 CONDENSER CLEANING AIR-COOLED
FREEZERS)
CAUTION
Hearing Protection Required!
This procedure emits a loud noise. Wear proper hearing
protection. Failure to wear proper hearing protection
may result in permanent hearing loss.
The condenser requires periodic cleaning. To clean the
condenser, refer to the following steps:
NOTE
Some freezers have a condenser filter. To clean,
remove and wash in warm soapy water. Rinse in
clean water and shake dry, taking care not to dam-
age filter in any way.
A. Visually inspect the condenser for dirt. (Remove front
panel on self-contained freezers.)
B. If the condenser is dirty, place a wet towel over the
front of the condenser.
C. Using compressed air or CO2 tank, blow out the dirt
from the back of the condenser. Most of the dirt will
cling to the wet towel.
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Potentiometer
4.3 DRIVE BELT TENSION ADJUSTMENT
To check belt tension, refer to Figure 21 and follow the
steps below:
WARNING
Disconnect all electric power before servicing. Follow
proper lockout/tagout procedures to ensure the power
cannot be inadvertently energized. Failure to disconnect
power before servicing could result in death or serious
injury.
WARNING
Moving belts and pulleys can crush and dismember. Do
not operate machine with cabinet panels removed.
A. Remove either side panel.
B. Press firmly on one belt. (See Figure 21)
C. When the tension is properly adjusted, the outside of
the depressed belt should be approximately in line
with the inside of the other belt.