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53NetworkAIR FM DX 60 Hz Operation, Maintenance, and Troubleshooting
Alarm messages and suggested actions
Displayed Alarm Message Action Required
Air Block Interlock Open • Verify that the air block panels are in place.
• Confirm that the wiring connections for the air block interlock switches are
secure.
Air Filter Clogged • Verify the condition of the return air filters, and replace them if required.
• Check the pressure drop across the filters by reviewing the System status.
• Ensure that the pressure-sensing tubing is properly connected to the sensors.
• Verify that the ends of the pressure-sensing tubing are not blocked or placed
incorrectly.
• Verify that the correct filter is selected in the System Options menu (Path:
Main > Setup > System # > System Config > System Options).
Airflow Low • Ensure that any field-installed dampers in the discharge duct are open.
• Ensure that any field-installed dampers in the return duct are open.
• Verify that the mode delay is not too short. If the mode delay is too short, the
Airflow Low alarm will occur after start-up and resolve itself after a few
minutes.
• Check the pressure drop across the filters, and replace the filters if necessary.
• Check the pressure drop across the evaporator coil on the Pressures screen
of the display interface (Path: Main Menu > Status > [Module] >
Pressures). The reading should be close to the recommended coil differential
pressure drops indicated in the table “Coil Differential Pressure Values” on
page 32. If the reading is too low based on Module size and options installed,
adjust the blower speed.
• Verify the proper operation of the Variable Frequency Drive (VFD) and
blower motors.
• Verify that the VFD overload alarm is not active.
Backup is Load Sharing • A backup System is contributing to meet the room load.
• No action required. The backup will return to idle when the demand falls.
Backup System Idle • A primary System has come back online after a failover or load-sharing
event.
• No action required.
Backup System Online • Indicates that a System failover has occurred. The backup System has come
online because another online System either failed or was commanded off. A
System Comm Loss alarm is considered to be a System failure if the Comm
Loss Failover configuration setting is Yes (the default setting).
• Check the event log to determine the cause of the primary System failure.
Blower 1 Requires Maintenance • Verify operation of Blower 1 and perform preventive maintenance.
• Reset the maintenance alarm for Blower 1 at the display interface.
Blower 2 Requires Maintenance • Verify operation of Blower 2 and perform preventive maintenance.
• Reset the maintenance alarm for Blower 2 at the display interface.
Compressor 1 Requires
Maintenance
• Verify the operation of Compressor 1 and perform preventive maintenance.
• Reset the maintenance alarm for Compressor 1at the display interface.
Compressor 2 Requires
Maintenance
• Verify the operation of Compressor 2 and perform preventive maintenance.
• Reset the maintenance alarm for Compressor 2 at the display interface.