50 Part Number STH042 7/15
Ice Making Sequence of Operation
NOTE: The On/Off button must be depressed and the ice
damper must be closed before the ice machine will start.
Water Purge Cycle
The ice machine purges any remaining water from the
water trough down the drain.
Freeze Cycle
Prechill - The refrigeration system chills the evaporator
before water flow over the evaporator starts. The water
inlet valve energizes during the pre-chill and remains on
until the ice thickness float switch is satisfied.
Freeze - Water flowing across the evaporator freezes
and builds 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
Any remaining water is purged down the drain as
refrigerant gas warms the evaporator. When the
evaporator warms, 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.
Full Bin Cycle
If the ice damper is held open by ice cubes the ice
machine shuts off. When the ice damper closes the ice
machine starts a new cycle at the water purge.
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