Control test, Table 8, Alert messages with troubleshooting guides – Carrier 17/19EX User Manual
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Control Test
The Control Test feature can check all of the thermistor temperature sensors, including those
on the Options modules, pressure transducers, pumps and their associated flow switches, the
guide vane actuator, and other control outputs, such as hot gas bypass. The tests can help to
determine whether a switch is defective, or a pump relay is not operating, among other useful
troubleshooting tests. During pumpdown operations, the pumps are energized to prevent
freeze-up and the vessel pressures and temperatures are displayed. The lockout feature will
prevent start-up of the compressor when no refrigerant is present in the machine, or if the
vessels are isolated. The lockout is then terminated by the operator by using the Terminate
Lockout function after the pumpdown procedure is reversed and refrigerant is added.
Table 8, A - N — LID Primary and Secondary Messages and Custom Alarm/Alert
Messages with Troubleshooting Guides