Electrical System | Section 6 |
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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
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Ice Thickness Probe
HARVEST LIGHT
This light’s 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 probes.
FREEZE TIME LOCK-IN FEATURE
The ice machine control system incorporates a freeze time
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 ICE.
MAXIMUM FREEZE TIME
The control system includes a
ICE THICKNESS CHECK
The ice thickness probe is
NOTE: Make sure the water curtain is in place when performing this check. It prevents water from splashing out of the water trough.
1.Inspect the bridge connecting the cubes. It should be about 1/8" (.32 cm) thick.
2.If adjustment is necessary, turn the ice thickness probe adjustment screw clockwise to increase bridge thickness, or counterclockwise to decrease bridge thickness. Set a 1/4” gap between the ice thickness probe and evaporator as a starting point. Then adjust to achieve a 1/8” bridge thickness.
NOTE: The starting point before final adjustment is approximately a 3/16 inch gap.
ADJUSTING SCREW
1/8” ICE BRIDGE THICKNESS
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Ice Thickness Check
Make sure the ice thickness probe wire and the bracket do not restrict movement of the probe.
Ice Thickness Probe Cleaning
1.Mix a solution of Manitowoc ice machine cleaner and water (2 ounces of cleaner to 16 ounces of water) in a container.
2.Soak ice thickness probe in container of cleaner/ water solution while disassembling and cleaning water circuit components (soak ice thickness probe for 10 minutes or longer).
3.Clean all ice thickness probe surfaces including all plastic parts (do not use abrasives). Verify the ice thickness probe cavity is clean. Thoroughly rinse ice thickness probe (including cavity) with clean water, then dry completely. Incomplete rinsing and drying of the ice thickness probe can cause premature harvest.
4.Reinstall ice thickness probe, then sanitize all ice machine and bin/dispenser interior surfaces.
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