58 Part Number STH098 06/19
Ice Making Sequence of Operation
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. 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. There is a
120 second prechill cycle on initial startup and a 60 second
prechill for all cycles thereafter. 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. 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.
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