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TROUBLESHOOTING
Unit connected to power source, display not on:
On initial startup, qualified service personnel should verify the input voltage at the receptacle.
1.
Verify input voltage on the incoming line side of the main breaker before checking if the breaker is tripped.
2.
Confirm that the main circuit breaker (located in the upper-left corner of the control enclosure) is not tripped.
3.
Reaching inside the machine section while the unit is energized can be dangerous. Always unplug the unit and lock out the
power supply before performing maintenance inside the unit.
Unit not cooling:
Verify that at least one of the redundant refrigeration systems is set to AUTO mode.
1.
Verify that the temperature control set point is set to the desired level.
2.
Verify that the unit door is closed. The door switch turns off the internal circulation blower and refrigeration.
3.
Confirm that the access port is sealed and that there is no moisture infiltration.
4.
5.
Confirm that circuit breakers inside of the control enclosure are not tripped.
Reaching inside the machine section while the unit is energized can be dangerous. Always unplug the unit and lock out the
power supply before performing maintenance inside the unit.
Refrigeration System Failure
Problems that cause refrigeration system failure are:
Compressor
Fail low amps (<2 amps)
Fail high amps (>20 amps)
Refer to the System Failures section of this manual for further information on system failures.
Electrica Hazard
Electrica Hazard
ULC SERIES INSTRUCTION MANUAL
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