Cylinder Frost Pattern - H.C Duke & Son 959R Operator’s Manual With Illustrated Parts List

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7.2

Cylinder Frost Pattern

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The cylinder frost pattern test will show the proper refrigeration. To test the refrigera-
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tion system and certain controls, perform the following:
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 1. Disconnect the main power supplies.
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2. Remove the dispense head and
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 3. Connect the main power supplies.
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 4. Turn the selector switch to "AUT O".
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5. Turn the manual timer knob one
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184981-02
beater shafts.
Observe the frost pattern as the
refrigeration system runs until the
cylinder thermostat satisfies (approxi-
mately 2 minutes). There should be
an even frost pattern starting 1" from
the front going to the rear of the
cylinder. If the frost pattern does not
look good contact H. C. Duke Service
Department.
During normal operation throughout
the course of the day, and when not
dispensing product, the unit should
run for a minimum of 30-60 seconds
about every 10-30 minutes.
quarter turn. Let the refrigeration
system run until it shuts off automati-
cally (approximately 1½ minutes) to
verify proper operation.
INSTALLATION AND SERVICE MANUAL 959R
6. On water-cooled models, check to
make certain that water is flowing
through the condenser by feeling the
water inlet and outlet tubes. The inlet
tube should feel cold and the outlet
tube warm. Be sure that the hand
shut-off valve is fully open.
7. While the unit is operating, listen for
unusual noises such as vibration
(metal tubes making contact), rattles
(loose mountings), or noisy belt s (dry
or misaligned belts .
8. All machines are carefully checked
for leaks prior to shipment. Neverthe-
less, it is advisable to inspect all
refrigerant tubing connections for
leaks with an electronic leak detector .
If leaks are detected, tighten the
connection and check the sight glass
for proper charge. If leakage persists ,
or if leakage is discovered at brazed
joints, it will be necessary to recover
the refrigerant and rep air the leak.
CAUTION
Hazardous moving parts.
Freezer starts
automatically.
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