Sub-Zero UC-15I Use & Care Manual page 6

Ice Machine Operation
Ice Making Operation
Depending on ambient conditions and cold water supply
temperature, the ice making process will take approxi-
mately 30 minutes.
1) Water fill cycle. (Initial start-up or start-up after
automatic shut-off.) Before the compressor starts, the
water inlet valve will purge old water from the system
for about three minutes.
2) Refrigeration system start-up. The compressor starts
after the water fill cycle and remains on throughout the
freeze and harvest cycles. The condenser fan motor
starts and runs throughout the freeze cycle.
3) Freeze cycle. The water pump sprays water into the
inverted cups. The water freezes layer by layer, until an
ice cube forms in each cup. The control system will
adjust the length of the freeze cycle to conditions.
4) Harvest cycle. The water pump shuts off and the
water inlet valve starts up to assist harvest and refill
the water sump. The evaporator is warmed, allowing
the cubes to release from the evaporator and drop into
the storage bin. The control system will adjust the
length of the harvest cycle to conditions and regulate
whether the condenser fan will run. At the end of the
harvest cycle, the ice machine will start another freeze
cycle.
5) Automatic shut-off. The level of ice in the storage bin
controls the automatic shut-off. When the bin is full, ice
will contact the bin thermostat clip. The bin thermostat
clip cools, signaling the ice machine to stop ice
production. When the ice level drops and ice no longer
contacts the bin thermostat clip, it will warm. The
increase in temperature will restart ice production.
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