Service manual

ManualsBrandsManitowoc ManualsIce MakerQ160

6-6

Section 6Service

Ice Thickness Probe (Harvest Initiation)

Ice Thickness Probe

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.

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

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.

ICE THICKNESS CHECK

The ice thickness probe is factory-set to maintain

the ice bridge thickness at 1/8” (3.2 mm).

1. Inspect the bridge connecting the cubes. It

should be about 1/8” (3.2 mm) thick.

2. If adjustment is necessary, turn the ice thickness

probe adjustment screw clockwise to increase

bridge thickness, or counterclockwise to

decrease bridge thickness.

NOTE: Turning the adjustment 1/3 of a turn will

change the ice thickness about 1/16” (1.5 mm).

Ice Thickness Check

Make sure the ice thickness probe wire and the

bracket do not restrict movement of the probe.

SV1738A

SV1208

1/8” (3.2MM)

ICE BRIDGE

THICKNESS

DJUSTING

SCREW