Sequence Of Operation - Welbilt Manitowoc NEO UDE0065A Technician's Handbook

SEQUENCE OF OPERATION

The On/Off button must be depressed and the ice damper
must be closed before the ice machine will start.
The following is the primary sequence of operation.
Software revisions will alter some of the timing sequences
and are noted in software revisions.
Initial Start-up From Shutoff
The dump valve energizes to purge any water in the water
trough down the drain. The harvest valve energizes to
equalize refrigerant pressures before the compressor
starts.
Freeze Cycle
Prechill - The refrigeration system chills the evaporator
before water flow over the evaporator starts. The water
inlet valve energizes during the prechill and remains on
until the ice thickness float switch is satisfied.
Freeze - Water flowing across the evaporator cools as
the freeze cycle progresses. (Software version 2.58 or
higher: The water pump turns off for 25 seconds and the
water inlet valve energizes for 7 seconds when the pump
restarts) Water flowing across the evaporator will start to
freeze and build ice on the evaporator. After a sheet of ice
has formed, the harvest float switch signals the control
board to start a harvest cycle.
Harvest Cycle
Every third cycle the remaining water is purged down
the drain. The refrigerant gas warms the evaporator and
the sheet of cubes slides off the evaporator and into the
storage bin. If all cubes fall clear of the ice damper the ice
machine starts another freeze cycle. The maximum harvest
time is a total of 7 minutes.
If the bin switch does not activate within 3.5 minutes, the
harvest cycle extends another 3.5 minutes.
Part Number 000014797 Rev02 05/19 69