Ice-O-Matic ICE0250 Series Probe Tip and Swivel, Cam Switch Operation-Single Evaporator Machines

ICE Series Electrical System

Probe Tip and Swivel

The probe tip is attached to the clutch and makes contact with the back of the ice slab during harvest. The swivel allows the probe tip to pivot as the clutch turns so that the probe is pushed straight through the evaporator probe guide.

The tip of the probe should be flush with the back of the evaporator or recessed up the 1/16 of an inch (.16cm). The probe tip must not extend into the freezing area of the evaporator during freeze.

(Note: Units manufactured after June 2004 utilize a non adjustable probe.)

The length of the probe is adjustable by loosening the locknut and adjusting the probe in or out of the swivel. Once the probe has been adjusted to the proper length, tighten the locknut. If the probe tip binds during operation it may cause the clutch to slip unnecessarily. This may occur if the harvest motor mounting bracket is not aligned properly or if the probe tip has excessive mineral deposits on it. Remove and clean the probe if necessary.

To check the probe tip for binding, remove the shoulder bolt holding the swivel to the clutch and simulate the movement of the swivel and probe by moving the swivel in a circular motion around the outer portion of the clutch. The swivel should also move freely. If any resistance is felt the bracket should be adjusted by loosening the bracket mounting screws and repositioning the bracket until the probe moves freely.

Cam Switch Operation-Single Evaporator Machines

The actuator arm of the cam switch rides on the edge of the clutch assembly and is actuated by the high and low portion of the cam. When the machine is in the freeze cycle the actuator arm of the cam switch is in the low part of the cam. During freeze, power is supplied to the water pump and relay 2, through the normally closed contacts of the cam switch. When the machine enters harvest, power is supplied to the water pump and purge valve through the normally closed contacts of the cam switch and through the normally open contacts of relay 1 (closed during harvest). The water pump, purge valve and relay 1 remain energized until the cam switch is lifted on to the high part of the cam. Relay 2 will also de-energize at this time allowing the machine to shut off if the bin switch opens. Undercounter machines manufactured after July of 2004 will have the water pump run continually until the machine shuts down.

Cam Switch Operation-Dual Evaporator Machines (Prior to January 2008)

Once the freeze timer has counted out, power is sent to: (A) harvest motor 1 and relay coil 1 through the normally closed contacts of cam switch 1, (B) to harvest motor 2 and relay coil 2 through the normally closed contacts of cam switch 2.

This 4-seconddelay will allow the harvest motors to rotate and allow the cam switches to switch to the normally open position before the low-pressure control opens during hot gas. The cam switches are now in the normally open position and will continue to energize the harvest motors and relays until the cam rotates and the switch returns to the normally closed position.

The bin switches are bypassed to allow the cam switch to return to the normally closed position, prior to the machine shutting down if the curtain is open. Each harvest assist motor will only make one revolution prior to shutting down on full bin or advancing to the next freeze cycle.

Both hot gas valves and the water purge valve remain energized until both harvest assist motors complete one revolution. The water pump is energized throughout the harvest cycle. The unit will shut down if the curtains are open during the freeze cycle.

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