Sequence Of Operation - Manitowoc SM Installation Use And Care Manual

Section 3

Sequence of Operation

Depending on ambient conditions and cold water supply
temperature, the ice making process will take
approximately 30 minutes.
1. Initial Start-Up or Start-Up After Automatic Shut-
Off — Water Fill
Before the compressor starts, the water inlet valve
will energize to purge old water from the system for
about 3 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
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
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 (Step 3).
Part Number 000001590
5. Automatic Shut-Off
The level of ice in the storage bin controls the ice
machine shut-off. When the bin is full, ice will
contact the bin thermostat bulb holder. The bin
thermostat bulb cools, which stops the ice machine.
The ice machine remains off until ice no longer
contacts the bin thermostat bulb holder and the
thermostat bulb warms up. The increase in
temperature will restart the ice machine (step 1).
Ice Machine Operation
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