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NetworkAIR FM DX 60 Hz Operation, Maintenance, and Troubleshooting78
Head pressure too
low
• Low refrigerant charge
• Condenser fan settings too low
• Condenser water regulating valve
malfunction
• System requires flooded
condenser control during low
ambient conditions
• Check subcooling and ensure it is at least
10-15
°F. Repair leak and recharge system.
• Adjust condenser fan setpoints.
• Check water regulating valve, actuator, and
linkage for proper operation.
• Install flooded condenser controls.
Humidifier
inoperative
• Humidification mode disabled
• Humidification setpoint too low
• Humidifier is in alarm
• Humidifier canister full of
sediment
• Blown fuse or fuses
• No power to electrodes
• Enable humidification mode.
• Raise humidification setpoint.
• Check front panel display for active humidifier
alarms.
• Replace humidifier canister.
• Check for shorted wiring, excessive current
draw, and proper input voltage. Replace fuse
or fuses with the specified type.
• Check contactor, wiring, and connections.
Humidity control is
not tight enough
• Excessive outside air infiltration
• Lack of proper room vapor barrier
• Humidification/dehumidification
setpoints not close enough
• Humidifier sensitivity % setpoint
too high
• Dehumidification PID loop is not
properly tuned
• Return air humidity does not
reflect actual room condition
• Reduce outside air infiltration.
• Install vapor barrier materials on floor, walls,
and ceiling as needed.
• Check and adjust humidification and
dehumidification setpoints.
• Reduce humidifier sensitivity % setpoint.
• Tune the PID loop for accurate
dehumidification operation.
• Check for short cycling of cold supply air.
• Check air distribution for deficiencies.
• Consider using remote sensor control.
Note: Be certain to purchase the correct
temperature and humidity probe. Check when
ordering that your equipment is compatible.
Module powered but
will not operate
• System is off
• Remote shutdown or input contact
is active
• System is in alarm
• System is idle (in group mode)
• Turn the System on.
• Check input contact configuration settings.
• Check front panel display for active system
alarms.
• Check group mode configuration settings.
Reheat elements
inoperative
• Reheat mode disabled
• Reheat setpoint too low
• Thermal cut out switch is open
• Blown fuse or fuses
• SCR controller malfunction
• Enable reheat mode.
• Raise reheat setpoint.
• Reset switch and check for proper airflow
across heater.
• Check for shorted wiring, excessive current
draw, and proper input voltage. Replace the
fuse or fuses with the specified type.
• Verify operation of SCR controller.
Problem Possible Cause Corrective Action