Ice Thickness Probe (Harvest Initiation); Ice Probe Light; Freeze Time Lock-In Feature - Manitowoc S300 Technician's Handbook

ICE THICKNESS PROBE (HARVEST INITIATION)

HOW THE PROBE WORKS
Manitowoc'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.

ICE PROBE LIGHT

This light's primary function is to be on as water
contacts the ice thickness probe during the freeze
cycle, and remain on throughout the entire harvest
cycle. The light will flicker as water splashes on the
probe.

FREEZE TIME LOCK-IN 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 ice
probe or 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
ICE.
146 Part Number 80-1479-3 7/10