Harvest Sequence - Manitowoc QuietQube Series Technician's Handbook

HARVEST SEQUENCE

5. Water Purge
The air pump(s) and the harvest valve(s) open at the
beginning of the water purge to divert refrigerant gas into
the evaporator.
The water pump continues to run, and the water dump
valve energizes to purge the water in the water trough.
CVD Condensing Unit:
When the refrigerant pressure is low enough to open
the fan cycling pressure control the condenser fan motor
stops.
6. Harvest
The air pump(s) remain energized and the harvest valve(s)
remains open. The refrigerant gas warms the evaporator
causing the cubes to begin melting and slide, as a sheet,
off the evaporator and into the storage bin.
If the damper/curtain does not open within 3.5 minutes in
the harvest cycle the following occurs:
• 3.5 minutes - The water inlet valve energizes until
water touches the high water level probe.
• 4 minutes - The water pump energizes.
• 6.5 to 7 minutes - The water dump valve energizes.
• If bin switch does not open before 7 minutes the ice
machine will start a Thaw Cycle xx
Single evaporator Iodels - The sliding sheet of cubes
opens the water curtain/ice damper and bin switch.
The momentary opening and re-closing of the bin switch
will terminate the harvest sequence and return to the
freeze sequence (Step 3 - 4).
Dual evaporator Iodels - The sliding sheet of cubes opens
the ice damper and bin switch. The momentary opening
and re-closing of the bin switch de-energizes the harvest
valve for that evaporator. When the bin switches have
opened and closed for both evaporators the ice machine
will terminate the harvest sequence and return to the
freeze sequence (Step 3 - 4).
Part Number: 000015431 Rev01 5/19 63