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INSTALLATION AND SERVICE MANUAL 917N-CMT, 927CMT, 957CMT
184617-02
7.2 Cylinder Frost Pattern
1. Disconnect the main power supply.
2. Remove the dispense head and
beater shaft.
3. Connect the main power supply.
4. Turn the selector switch to "AUTO".
Observe the frost pattern as the
refrigeration system runs until the
cylinder thermostat satisfies (ap-
proximately 2 minutes). There
should be an even frost pattern
starting 1" from the front going to the
rear of the cylinder.
During normal operation throughout
the course of the day, and when not
dispensing product, the unit should
run for a minimum of 30-50 seconds
about every 8-10 minutes.
5. Turn the manual timer knob one
quarter turn. Let the refrigeration
system run until it shuts off automati-
cally (approximately 1½ minutes) to
verify proper operation.
The cylinder frost pattern test will show the proper refrigeration. To test the refrigera-
tion system and certain controls, perform the following:
CAUTION
Hazardous moving parts.
Freezer starts
automatically.
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. Check to be sure the
water flow stops when the compres-
sor is not running. 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 belts (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 repair the leak.
