Data Aire dap4 - Operation of Airside Economizer; Economizer Activation Notice

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Zone Control Operation (continued)
Important Notice
The Zone Control feature requires an activation code for each unit in the
network.
All units in a zone must have the same software version. If units were installed at
different times, they may not have the same software version. Please check the
dap4 software version by using menu F- “Information”. Please contact the Data
Aire service department to obtain a software update for USB installation if
needed. Please read the Zone Control supplement for installation information.
Fan Operation is based on the fan mode setting of Unit 1:
Disabled - (default) The Zone Control does not control the fan of the units and the
unit will use its own fan control mode.
Constant Airflow – The Zone Control will modulate the fan speed of all running
units in the zone to maintain the zone airflow set point. All units in the zone will be
controlled by Unit 1 regardless of the unit’s own setting. This selection requires an
optional airflow measuring sensor to be installed. An additional airflow tuning
screen will appear in the Zone Control menu allowing you adjust the airflow set
point and tune the airflow modulation.
Unity Cooling – Allows a BMS system to control the airflow set point.
Maximum Rack - The Zone Control will modulate the fan speed of all running
units in the zone based on the maximum rack temperature.
Average Rack - The Zone Control will modulate the fan speed of all running units
in the zone based on the average rack temperature
C Air Prs - The Zone Control will modulate the fan speed of all running units in the
zone to maintain static air pressure. If all units have an air pressure sensor
installed, Unit 1 will use the lowest usable reading. Otherwise Unit 1 will use its air
pressure sensor.
Note: The rack selections described above, require each unit to have rack temperature
sensors installed. The rack temperature of each unit can be customized to use the
average or highest temperature of its sensors. Unit 1 can be set to take the average or
highest temperature of the other units in the zone. Additional rack sensor information is
available on a publication dedicated to this optional feature.