Manitowoc QD0672C Specifications download pdf (Page 35)

Section 3 Ice Machine Operation

Part No. 80-1175-3, 6/03 3-3

HARVEST SEQUENCE

5. Water Purge

The water pump continues to run, and the water dump

valve energizes for 45 seconds to purge the water in the

sump trough. The water fill valve energizes (turns on) for

the last 15 seconds of the 45-second water purge.

After the 45 second water purge, the water fill valve,

water pump and dump valve de-energize. (Refer to

“Water Purge Adjustment” for details.)

The cool vapor solenoid valve also opens at the

beginning of the water purge to divert refrigerant gas into

the evaporator.

When the refrigerant pressure is low enough to open the

fan cycling pressure control* the condenser fan motor

stops.

* The Q0600C ice machine does not use a fan cycle

control, therefore the condenser fan motor will

continue to run in the harvest cycle.

6. Harvest

The cool vapor solenoid valve remains open and the

refrigerant gas warms the evaporator causing the cubes

to slide, as a sheet, off the evaporator and into the

storage bin. The sliding sheet of cubes swings the water

curtain out, opening the bin switch.

The momentary opening and re-closing of the bin switch

terminates the harvest sequence and returns the ice

machine to the freeze sequence (steps 3-4).

AUTOMATIC SHUT-OFF

7. Automatic Shut-Off

Ice Machine Section: When the storage bin is full at the

end of a harvest sequence, the sheet of cubes fails to

clear the water curtain and will hold it open. After the

water curtain is held open for 7 seconds, the ice

machine shuts off. The ice machine remains off for 3

minutes before it can automatically restart.

CVD Condensing Unit: The liquid line solenoid valve

closes, allowing the refrigeration system to pump down.

when the refrigerant pressure is low enough to open the

fan cycling pressure control* the condenser fan motor

stops. When the refrigerant pressure is low enough to

open the low pressure control, the contactor coil is de-

energized and the compressor stops.

The ice machine remains off until enough ice has been

removed from the storage bin to allow the ice to fall clear

of the water curtain. As the water curtain swings back to

the operating position, the bin switch re-closes and the

ice machine restarts (steps 1 - 2), provided the 3 minute

delay period is complete.

* The Q0600C ice machine does not use a fan cycle

control, therefore the condenser fan motor will

energize and de-energize with the compressor.

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Manitowoc QD0672C Specifications Page 35

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