Scotsman SCE275 - Manual (Page 19)

SCE275
January 2003
Page 19
Technicians Only: Harvest Cycle Operational Sequence
Harvest
The (air cooled) fans are off.
The water valve opens and fills the reservoir to the
Full level.
The water pump shuts off, it will restart in less than
a minute.
The AutoIQ Controller checks how long it takes to
fill the reservoir and if it was too much time, the
machine Shuts Down on Water Error.
Note: The machine will automatically attempt to
restart after shutting down because of a lack of
water. The time between restarts is about 20
minutes.
The inlet water valve will stay on and open for a
predetermined fraction of the time it took to fill the
reservoir. This overflows and rinses the reservoir
water.
During the Harvest Cycle, ice will be falling from
the evaporators and between the bin control’s
electric eyes. The harvest cycle’s length is based
on the actual time from the start of the prior harvest
cycle until the last cube fell, plus an added amount
of time as a margin.
The maximum harvest cycle time allowed is 8
minutes. Harvest time is varied by the AutoIQ
Controller based on the prior harvest cycle’s
length.
If no cubes fall (or are sensed) by the end of
Maximum Harvest Time, the controller senses a
refrigeration error. If the next cycle also produces a
refrigeration error, the machine Shuts Down.
Note: The last Harvest cycle before shutting off
on Bin Full will be longer than normal (4-5
minutes).
During a harvest cycle, the water pump will shut off
when the bin sensors indicate that the bin is full.
Note: The machine will not restart for 4 minutes
after switching off on Bin Full, unless the freeze
button is pressed.
Diagnostic Lights:
There are two diagnostic lights, one to indicate a
water problem, and the other to indicate a
refrigeration problem.
If a Diagnostic
Light: Water Light Refrigeration
Light
Blinks once and
repeats Water pump did
not start Very long ice
harvest
Blinks twice
and repeats Lack of water
fill No harvest of
ice
Blinks three
times and
repeats not used High discharge
temperature
Is On all the
time Water valve
leaking thru
rapidly Check for low
discharge
temperature or
long freeze
cycle
Both On all the
time Check for thermistor set
unplugged or failed
Restarts:
The controller will attempt to restart the ice
machine after the first and second shut downs
because of a water or refrigeration error.
There will be a 50 minute interval between restarts.
There are two exceptions to this:
1. Lack of water. The controller will try to refill the
reservoir about every 20 minutes after shutting
down for lack of water.
2. Harvest errors: The controller must sense two
consecutive harvest errors in order to stop the
machine. The controller will try to operate the
machine two additional times before a manual
reset is needed.