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Section 5
SAFETY LIMITS
General
In addition to standard safety controls, the control board
has two built in safety limit controls which protect the ice
machine from major component failures.
Safety Limit #1: If the freeze time reaches 60 minutes,
the control board automatically initiates a harvest cycle.
If three consecutive 60-minute freeze cycles occur, the
ice machine stops.
Safety Limit #2: If the harvest time reaches 3.5
minutes, the control board automatically returns the ice
machine to the freeze cycle. If three consecutive 3.5
minute harvest cycles occur, the ice machine stops.
Safety Limit Stand-By Mode:
The first time a safety limit shut down occurs, the ice
machine turns off for 60 minutes (Stand-by Mode). The
ice machine will then automatically restart to see if the
problem reoccurs. During the Stand-By Mode the
harvest light will be flashing continuously and a safety
limit indication can be viewed. If the same safety limit is
reached a second time (the problem has reoccurred) the
ice machine will initiate a safety limit shut down and
remain off until it is manually restarted. During a safety
limit shut down the harvest light will be flashing
continuously.
Part Number 000001774 07/08
Before Calling for Service
Determining Which Safety Limit
Stopped The Ice Machine
When a safety limit condition causes the ice machine to
stop, the harvest light on the control board continually
flashes on and off. Use the following procedures to
determine which safety limit has stopped the ice
machine.
1. Move the toggle switch to OFF.
2. Move the toggle switch back to ON.
3. Watch the harvest light. It will flash one or two times,
corresponding to safety limits 1 and 2, to indicate
which safety limit stopped the ice machine.
After safety limit indication, the ice machine will restart
and run until a safety limit is exceeded again.
Safety Limit Notes
•
A safety limit indication is completed before the water
pump starts. Water contacting the ice thickness
probe in the freeze cycle will cause the harvest light
to flash. Do not mistake a harvest light flashing in the
freeze cycle with a safety limit indication.
•
A continuous run of 100 harvests automatically
erases the safety limit code.
•
The control board will store and indicate only one
safety limit – the last one exceeded.
•
If the toggle switch is moved to the OFF position and
then back to the ON position prior to reaching the
100-harvest point, the last safety limit exceeded will
be indicated.
•
If the harvest light did not flash prior to the ice
machine restarting, then the ice machine did not stop
because it exceeded a safety limit.
5-3
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