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Troubleshooting: Semi-Annual Preventive Maintenance
68 NetworkAIR IR Operation, Maintenance, and Troubleshooting
Airflow too high • External static pressure may
be too low.
• Check the evaporator coil pressure drop through
the display interface. Pressure should match the
recommended pressure drops indicated on the
chart based on Module size. If the pressure drop is
above the recommended settings, decrease the
blower speed until the pressure drop matches the
recommended setting. See “Calibrate airflow
manually” on page 17.
Temperature control
not precise enough
• Cooling and reheat settings
are not close enough.
• Reheat PID loop is not
properly tuned.
• SCR controller is not
working.
• The mode of operation is
turned off.
• Non-essential lockout has
been activated by a user-
defined input with the
equipment.
• Return air temperature is
reading incorrectly.
• Check setpoints for cooling and heating as well as
deadbands.
• Tune the PID loop for accurate reheat operation.
• Confirm the operation of the SCR controller.
• Check to verify that the proper modes of
operation, cooling, and reheat are activated. A
Module must have specific options installed to
allow all modes of operation to be active.
• Review event log to see if this alarm input has
been activated.
• Return air is not coming from the common space
and may be influenced by a close heat source or a
discharge air duct affecting return air
temperatures. Try to eliminate the hot or cold air
stream or relocate the sensor for better room
temperature readings.
Humidification
control is not
precise enough
• Check the setpoints for
humidification and
dehumidification.
• Humidifier may not be
operating correctly.
• The mode of operation is
turned off.
• Non-essential mode input
has been activated by
customer interface with
equipment.
• The room is not properly
sealed internally to maintain
vapor pressure in the
controlled space.
• Verify that the setpoints are not too far apart.
Typical setpoint between humidification and
dehumidification is 10%.
• Verify humidification operation. Ensure that there
are no humidifier alarms that could impede the
humidification process.
• Ensure that the proper modes of operation,
humidification and dehumidification, are
activated. A Module must have specific options
installed to allow all modes of operation to be
active.
• Review the event log to see if this alarm input has
been activated.
• The room must have an adequate vapor barrier
installed to maintain humidification and
dehumidification setpoints. The vapor barrier is
inadequate if humidity in the controlled space
changes based on influences from the surrounding
air outside the controlled space.
Problem Possible Cause Corrective Action