DX Mode: The fan operation while compressor is running. The selections are:
Constant Speed: (default selection) Fan runs at a constant speed.
BMS Speed: Fan begins at the constant speed setting then modulates via
the BMS communicated value. The value written by BMS must be within the
Min and Max modulation limits.
Air Pressure: (Not shown on IRDX model). Fan modulates to maintain the
static air pressure set point.
Const Flow: Fan modulates to maintain the airflow set point.
BMS Flow*: Fan modulates to maintain the airflow of the BMS.
Mod to Comp: Fan modulates to variable compressor speed.
Mod to Rack: Fan modulates to rack temperature to maintain temp set
point.
Mod to RetT: (Shown only on IRDX model). Fan will modulate to the return
air temperature to maintain the fan temperature set point.
Note on Return and Rack temperature settings: Fan modulation begins
when the temperature rises above the Fan Temp Setpoint plus Fan Temp
Deadband (Setpoints menu). The fan modulation will then increase 10% for
every 0.1 degree the temperature rises.
Mod to deltaT: (Shown only on IRDX model). Fan will modulate to the
difference between return and discharge temperature to maintain the delta
temperature set point. Modulation uses a PID algorithm.
DX Speed: The DX constant speed has a range of adjustment from 60 to 100%
with a default setting of 85%.
*Warning: When using BMS fan modes: Data Aire will not be responsible for
malfunctions or space control conditions caused by a BMS failure or an
improper speed command.
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