Section 6 | Electrical System |
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Symptoms
Bin Switch Fails Open
•The ice machine will not start with the toggle switch in the ice position, but runs normally with the toggle switch in the clean position.
Bin Switch Fails Closed
•Safety limit 2 is recorded in the control board memory and the harvest cycle continues after the ice opens and closes the water curtain (harvest cycle is 3.5 minutes long).
Diagnostic Aids:
•Always use the water curtain magnet to cycle the switch (a larger or smaller magnet will affect switch operation).
•Readings are affected by your test lead connection and VOM battery strength. Verify you have solid connections and a correctly functioning VOM before testing bin switch.
•Open the curtain for 3 seconds, then close the curtain for 3 seconds. This will allow your VOM display to settle.
•With the bin switch closed your meter reading should be 0 (0 to 10 is acceptable). With the curtain open the reading must be infinity (OL).
Continuity Test
1.Disconnect the bin switch wires to isolate the bin switch from the control board.
2.Connect an ohmmeter to the disconnected bin switch wires.
3.Cycle the bin switch open and closed 25 times by opening and closing the water curtain. Watch for consistent readings each time the bin switch is cycled open and closed (bin switch failure could be erratic).
Water Curtain Removal Notes
The water curtain must be on (bin switch closed) to start ice making. While a freeze cycle is in progress, the water curtain can be removed and installed at any time without interfering with the electrical control sequence.
If the ice machine goes into harvest sequence while the water curtain is removed, one of the following will happen:
•Water curtain remains off:
When the harvest cycle time reaches 3.5 minutes and the bin switch is not closed, the ice machine stops as though the bin were full.
•Water curtain is put back on:
If the bin switch closes prior to reaching the 3.5- minute point, the ice machine immediately returns to another freeze sequence prechill.
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