Manitowoc Indigo Series Technician's Handbook page 105

Harvest Sequence
5. Water Purge
The air pump (when used) the harvest valve(s) and
harvest pressure regulating valve (HPR) open at the
beginning of the water purge to divert hot refrigerant
gas to the evaporator.
The water pump continues to run, and the water dump
valve energizes to purge the water in the water trough.
6. Harvest
The HPR valve, air pump and harvest 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 opens the water curtain/ice damper
and 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.)
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/ice damper and will hold it open. After the
water curtain/ice damper is held open for 30 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 drop
clear of the water curtain/ice damper. As the water
curtain/ice damper closes the bin switch the ice
machine restarts (steps 1 - 2) provided the 3 minute
delay period is complete.
Part Number STH025 02/12 105