Green Board Sensors; Green Board Voltage Check; Green Board Voltage Selector Switch; Green Board Ice Bridge Thickness Potentiometer (Pot) Factory Reset - Cornelius I-SERIES Training Manual

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4.2
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Condenser sensor and suction line sensor are thermistors rated at 2815 ohms ± 5% at
32° F (0° C).
Condenser Sensor signals the circuit board for fan cycling, and serves as the high-
temperature safety shutdown. The Error-LED will flash once a second during high
temperature safety shutdown. Manual reset must be performed to restart "ON" at
100°F, "OFF" at 88°F
Suction Line Sensor signals the circuit board about the suction line temperature.
This controls the ice bridge thickness. The ice machine has 6 minutes to reduce suc-
tion line temperature to 40° F (4.4° C) in the freeze mode (Error-LED is ON) before
a safety shutdown. Manual reset must be performed to restart at 150°F.
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4.3
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1. Turn ice machine power switch OFF.
2. Disconnect proximity switch plugs from the control board.
3. Set the multimeter for DC volts and connect leads to the top 2 pins of the right
hand and left hand evaporator.
4. Turn ice machine power switch ON.
5. Meter should read 5 VDC ± .2 VDC. If not, replace circuit board.
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4.4
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Check Circuit Board
1. Turn ice machine power switch OFF. Disconnect sensor plug from board.
2. Use digital multimeter set for DC voltage. Connect leads of meter across the two
test plug pins of the sensor being checked.
3. Turn power switched ON.
4. Meter should read 2.5 ± .2 VDC. If voltage is not correct, replace the circuit
board.
Check Thermistor Sensor(s)
1. Disconnect the suction line sensor (brown) from the control board.
2. Install a special test cord (p/n 164984009) to the controller board.
3. Reinstall the suction line sensor.
4. Set the multimeter for milli-volts DC and connect it to the special test cord leads.
5. Operate the ice machine in freeze cycle.
© 2001, IMI Cornelius Inc.
I-Series Ice Machine Training Manual
Sensors
Voltage Check
Thermistor Sensor Diagnostics
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