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NetworkAIR FM DX 60 Hz Operation, Maintenance, and Troubleshooting58
MultiCool Coil No Coolant
Flow
• Verify the flow from the chilled water supply.
• Check the operation of the flow switch.
• Check the electrical connections to the flow switch.
• Verify that the chilled water supply isolation valve is open.
No Backup Systems Available • Check the number of Systems designated for the backup role.
• Check that the primary or backup Systems are not in a failed state, in the
Comm Lost state, or Off.
Primary Sensors Failed • Verify that there is a proper CAN connection between the sensors and the
user interface box.
• Check the connections of the 25-pin serial communication cable from the
main controller board to the customer interface box.
• Replace the sensor assembly.
Remote Sensor Removed • Check the CAN bus connection to the remote sensor.
• Disregard this alarm if you removed the remote sensor.
Remote Sensor Added • Check the CAN bus connection to the remote sensor.
• Disregard this alarm if you added the remote sensor.
Replace Steam Cylinder • Replace the steam cylinder.
Return Sensor Fail • Verify that there is a proper CAN connection between the sensors and the
user interface box.
• Replace the sensor assembly.
Secondary Sensors Failed • Verify that there is a proper CAN connection between the remote sensors and
the user interface box.
• Check the remote sensor dip switch settings for proper address configuration.
• Check the connections of the 25 pin serial communication cable from the
main controller board to the customer interface box.
• Replace the sensor assembly.
Smoke Detected • Confirm that the wiring connections to the wiring harness are secure.
• Ensure the smoke head and sub-base are properly attached.
• Ensure that there is not dirt or dust on the smoke head. Use pressurized air to
clean the smoke head chamber.
• Replace the smoke detector.
Suction Pressure Low • Confirm (at the display interface) that the pressure drop across the evaporator
coil is within the acceptable range (Path: Main Menu > Status > [Main or
Expansion] Module > Pressures).
• Confirm that the cooling setpoint is not below 20°C (68°F).
• Verify the condition of the return filters. Check (at the display interface) the
pressure drop across the filters (Path: Main Menu > Setup > System >
System Config > System Options).
• Confirm that the outdoor heat exchanger is operating properly and that its
setpoints are correct.
• Confirm proper refrigerant charge in the Module.
• Confirm proper Module setup and that the correct Module size is indicated
on the display interface.
• Verify that the evaporator coil is clean and free of debris.
Displayed Alarm Message Action Required