Manitowoc QD1092N Specifications download pdf (Page 27)

Section 3 Ice Machine Operation

Part Number 000001759 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)

and de-energizes (turns off) strictly by time. The water fill

valve energizes for the last 15 seconds of the 45-second

water purge. The water purge

must be at the factory

setting of 45 seconds for the fill valve to energize during

the last 15 seconds of the Water Purge. If set at less

than 45 seconds the water fill valve does not energize

during the water purge.

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

water pump and dump valve de-energize. The harvest

valve also opens at the beginning of the water purge to

divert hot refrigerant gas into the evaporator.

6. Harvest

The harvest 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 (Step 3 - 4.)

Figure 3-3. Harvest Sequence (Typical Q460 Shown)

AUTOMATIC SHUT-OFF

7. Automatic Shut-Off

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.

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.

Figure 3-4. Automatic Shut-Off (Typical Q460

Shown)

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Manitowoc QD1092N Specifications Page 27

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