Ice Thickness Probe - Koolaire KY0275W Technician's Handbook

ce Thickness Probe
How the Probe Works
Koolaire's electronic sensing circuit does not rely on
refrigerant pressure, evaporator temperature, water levels
or timers to produce consistent ice formation.
As ice forms on the evaporator, water (not ice) contacts
the ice thickness probe. After the water completes this
circuit across the probe continuously for 6-10 seconds, a
harvest cycle is initiated.
Freeze Time Lock-
n Feature
The ice machine control system incorporates a freeze
time lock-in feature. This prevents the ice machine from
short cycling in and out of harvest.
The control board locks the ice machine in the freeze
cycle for six minutes. If water contacts the ice thickness
probe during these six minutes, the harvest light will
come on (to indicate that water is in contact with the
probe), but the ice machine will stay in the freeze cycle.
After the six minutes are up, a harvest cycle is initiated.
This is important to remember when performing
diagnostic procedures on the ice thickness control
circuitry.
To allow the service technician to initiate a harvest cycle
without delay, this feature is not used on the first cycle
after moving the toggle switch OFF and back to ON.
Maximum Freeze Time
The control system includes a built-in safety, which will
automatically cycle the ice machine into harvest after
60 minutes in the freeze cycle.
Part Number STH047 5/16 99