Harvest Time Out; Possible Causes; Bin Full Delay; Low Condenser Temperature Delay - Cornelius XAC 1444 Service Training Manual

Xtreme Ice Training Manual

HARVEST TIME OUT

1. If the microprocessor does not recognize all proximity switch circuits opening 4 minutes after the hot
gas valve opens during the harvest cycle, the machine enters a delay sequence.
2. After each delay, the machine restarts at the secondary start up.
3. The delay sequence continues as follows:
S Harvest try, 30 min delay, harvest try, 30 min delay, harvest try, 2 hr delay.
S Harvest try, 30 min delay, harvest try, 30 min delay, harvest try, 2 hr delay.
S Harvest try, 30 min delay, harvest try, 30 min delay, harvest try, 2 hr delay.
S Harvest try, 30 min delay, harvest try, 30 min delay, harvest try, 2 hr delay.
S Harvest try, 30 min delay, harvest try, 30 min delay, harvest try, shut down.
4. During the delay times, the DELAY LED flashes 3 times at 4 second intervals.
5. Once the machine reaches shut down position all out puts turn off.
6. At the shut down time, the ERROR LED flashes 3 times at 4 second intervals.
7. The machine will not run until the power is cycled.
8. The delay sequence resets after each successful harvest.

Possible Causes

1. Hot gas valve failure
2. Low refrigerant charge
3. Prox. Switch
4. Compressor failure

BIN FULL DELAY

1. During the harvest cycle if the microprocessor does not recognize all proximity switch circuits close 5
second after the last one opens, the machine enters a delay sequence.
2. The machine turns off all outputs except the bin full output.
3. The microprocessor monitors the proximity switch circuits waiting for all circuits to close.
4. After all circuits close, the machine continues with the dump cycle.

LOW CONDENSER TEMPERATURE DELAY

1. After initial start up, the microprocessor continuously monitors the condenser temperature.
2. If the condenser temperature falls to 36_F, all outputs turn off.
3. The machine stays in a delay mode as the microprocessor continues to monitor the condenser tem-
perature.
4. During the delay time, the DELAY LED flashes 6 times at 4 second intervals.
5. If the condenser temperature rises to 42_F while in this delay mode, the machine will restart at sec-
ondary start.
Possible Causes
1. Cold ambient temperature 50_F or below.

HIGH CONDENSER TEMPERATURE

1. While monitoring the condenser temperature, the microprocessor monitors high temperatures.
2. If the condenser temperature rises to 150_F, all outputs turn off.
3. The machine delays for 30 minutes, and a restart ensues at secondary start up.
4. If the condenser temperature rises to 150_F again, all outputs turn off.
5. The machine delays for 30 minutes, and a restart ensues at secondary start up.
6. If the condenser temperature rises to 150_F a third time, the unit shuts down.
October 17, 2005 23 TP00952