American Power Conversion DX, FM manual Up Down

#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.

18 NetworkAIR FM DX 60 Hz Operation, Maintenance, and Troubleshooting