Manitowoc Ice STH003 manual Refrigeration System Start-Up, Freeze, Harvest, Automatic Shut-Off

ICE MAKING 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).

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).

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