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NetworkAIR FM DX 60 Hz Operation, Maintenance, and Troubleshooting
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# PCIOMs. Set the number of Programmable Customer Input/Output Modules (PCIOMs) installed
in the user interface box. This setting controls the number of input contacts and output relays
available in the Input/Output menu.
See “Contacts and Relays” on page 25 to set up the contacts and relays from the display
interface.
See the NetworkAIR FM DX 60 Hz Installation manual to connect the contacts and relays
to the Main Module.
# Modules in Sys. Indicates the number of Modules in this System. Up to three Modules can be
joined together to work as a single System.
Air Filter. Set the type of air filters installed in the Modules of this System to either standard (30-
40%) or high efficiency (65-85%).
Fast Startup. Set the System to bypass the normal start-up sequence and start-up delay the next
time power is applied to the System.
Note: The Fast Startup option is not recommended for typical installations.
Airflow. Set the airflow pattern for the Modules in this System.
• Up
• Down
Rej. Method. Indicates the method used for heat rejection by the refrigeration system.
• Air
• Water
• Glycol
Dehum Capacity. The dehumidify mode can be set to use half capacity or full capacity of the
cooling coil.
• Half capacity uses one compressor and half of the cooling coil to dehumidify. Rooms with
small heat loads should use half capacity to avoid over-cooling while dehumidifying.
• Full capacity uses the entire coil and both compressors.
When the unit is in dehumidification mode the dehumidification solenoid valve on the secondary
liquid line is not energized and remains closed. All refrigerant is directed through the expansion
valve which feeds three quarters of the cooling coil.
Module Rot. The System rotates the order in which the compressors are engaged to equalize the
total number of hours that each compressor runs. Set the number of hours at which to change the
order in which the compressors are engaged. A setting of zero indicates that the order in which the
compressors are engaged should not be changed.
Refrigerant. Set to the type of refrigerant charge used in the direct expansion refrigeration system..
Suction Pressure Compensation. Allows the System to slow the blowers if the suction pressure
gets too high. Use this setting if you are using the FM in a high-density application.