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CME456R
Technicians Only: Harvest Cycle Sequence & Other Notes
Harvest
The Purge Valve will be open for 40 seconds.
The water pump shuts off, it will restart before 40
seconds, the restart time is based on the Purge
Level Setting.
The pump restarts and pumps water out of the
reservoir until the purge valve closes.
The inlet water valve will stay on for about 30
seconds to add enough water to assist with
harvest.
The Hot Gas Valve will be open for the entire
length of the Harvest Cycle.
The Harvest Bypass Valve will be open for a few
seconds (between 4 and 12, depending upon
discharge temperature) at the beginning of the
Harvest Cycle.
During the Harvest Cycle, ice will be falling from
the evaporators and between the ice sensor's
electric eyes. The AutoIQ Controller monitors the
ice falling and uses that information to determine
the next harvest cycle length.
The first Harvest after a restart will take about 6
minutes to establish a base line, then the time it
took to release that ice is used to determine the
next harvest cycle's length.
The maximum harvest time is 14 minutes.
If no cubes fall (or are sensed) by the end of the
Maximum Harvest Time, the machine senses a
Refrigeration error. If the next cycle also produces
a Refrigeration error, the machine will shut down.
Note: The last Harvest cycle before shutting off on
Bin Full will be about 6 minutes long.
Note: The machine will not restart for 4 minutes
after switching off on Bin Full, unless the Freeze
button is pressed.
Bin Full: The controller will switch on the
compressor for 30 seconds after 25 hours of off
time to keep refrigerant out of the compressor oil.
Continuous Run Time
A unit that operates 24 hours a day 7 days a week
is too small for the user's needs. To maintain
harvest integrity, the controller will extend the
harvest time to 6 minutes every 15th consecutive
harvest cycle.
Bin Thermostat:
In normal ambients the thermostat will react to ice
on the bulb in a few seconds. Reaction after
removal will take about a minute under normal
conditions, and longer in colder rooms.
Diagnostic Light Code Table
If a Diagnostic
Light
Blinks once and
repeats
Blinks twice and
repeats
Blinks three
times and
repeats
Is ON all the
time
Both ON all the
time
Note: Diagnostic lights remain on until the
controller is manually reset or until it successfully
restarts the machine.
December 2000
Page 22
Refrigeration
Water Light
Light
Water pump will
Very long ice
not start
harvest
No harvest of
Lack of water fill
ice
High Discharge
not used
Temperature
Check for low
Water valve
discharge
leaking thru
temperature or
rapidly
long freeze
cycle
Check for thermistor set unplugged
or failed
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