Service manual

6-2
Section 6Service
Bin Switch
Function
Bin switch operation is controlled by the movement
of the ice damper. The bin switch has two main
functions:
1. Terminating the harvest cycle and returning the
ice machine to the freeze cycle.
This occurs when the bin switch is opened and
closed again within 7 seconds of opening during
the harvest cycle.
2. Automatic ice machine shut-off.
If the storage bin is full at the end of a harvest
cycle, the sheet of cubes fails to clear the ice
damper and holds it down. After the ice damper
is held down for 7 seconds, the ice machine
shuts off.
The ice machine remains off until enough ice is
removed from the storage bin to allow the sheet
of cubes to drop clear of the ice damper. As the
ice damper swings back to the operating
position, the bin switch closes and the ice
machine restarts.
Important
The ice damper must be up (bin switch closed) to
start ice making.
Specifications
The bin switch is a magnetically operated reed
switch. The magnet is attached to the upper right
corner of the ice damper. The switch is attached to
the evaporator mounting bracket.
The bin switch is connected to a varying D.C.
voltage circuit. (Voltage does not remain constant.)
NOTE: Because of a wide variation in D.C. voltage,
it is not recommended that a voltmeter be used to
check bin switch operation.
Check Procedure
1. Set the toggle switch to OFF.
2. Watch the bin switch light on the control board.
3. Move the ice damper upward, toward the
evaporator. The bin switch must close. The bin
switch light “on” indicates the bin switch has
closed properly.
4. Move the ice damper away from the evaporator.
The bin switch must open. The bin switch light
“off” indicates the bin switch has opened
properly.
Ohm 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. Set the ohmmeter to the 10,000-
ohm scale.
3. Cycle the bin switch by opening and closing the
ice damper.
4. With the bin switch open: Resistance readings
of more than 30,000 ohms indicate a correctly
operating bin switch.
5. With the bin switch closed: Resistance readings
of less than 70 ohms indicates a correctly
operating bin switch.
Important
Any reading between 70 and 30,000 ohms,
regardless of ice damper position, indicates a
defective bin switch
Bin Switch Resistance Readings
0 OHMS
GOOD
GOOD
70 OHMS
SWITCH CLOSED
30,000 OHMS
SWITCH OPEN
INFINITE
OHMS
METER
READS
(OL)
BAD