Section 4Ice Machine Sequence of Operation
4-2
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. After the 45 second water purge, the
water pump and dump valve de-energize. The hot gas
valve(s) also opens at the beginning of the water
purge, to divert hot refrigerant gas into the
evaporator.
New style circuit boards have an adjustable water
purge in the harvest cycle. This permits a 0 (off), 15,
30 or 45 second purge cycle.
6. Harvest
The hot gas valve(s) 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.)
Harvest Sequence (Typical J450 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.
Automatic Shut-Off (Typical J450 Shown)
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