Welbilt Koolaire KD0270A, Technician'S Handbook, Page: 64 / 136

64 Part Number STH047 Rev01 10/18
Safety Limits
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. 3
cycles outside the time limit = 1 hour Stand-by Mode.
Safety Limit #2: If the harvest time reaches 3.5 minutes,
the control board automatically returns the ice machine
to the freeze cycle. 3 cycles outside the time limit = Safety
Limit (must be MANUALLY reset).
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.
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.