Cornelius IWC322 Technical Information PDF herunterladen (Seite 29)

I-Series Ice Machine Training Manual

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4.2 GREEN BOARD Sensors

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.

4.3

GREEN BOARD

Voltage Check

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.

4.4 GREEN BOARD Thermistor Sensor Diagnostics

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.

SERVICE

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Cornelius IWC322 Technical Information Seite 29