Data Aire dap4 User Manual

82
MENU M – Set Zone Control (continued)
Avg Rack - The Zone Control will modulate the fan speed of all running
units in the zone to the average rack temperature. This selection requires
optional rack temperature sensors.
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, the lowest usable reading is used. Otherwise only
the air pressure sensor of Unit 1 will be used.
Zone Air FLow
Zone AF SP: 3200cfm
Integration Time: 39s
Band Factor: 53.0%
Derivative Time: 4s
Assist on Demand: 75%
This screen will only appear if Fan Mode is set to “C. Flow”.
Zone AF SP - The airflow set point for the zone in cubic feet per minute.
This set point is the same one that appears on the “Zone Airflow” screen in
the set points loop.
Integration Time – This setting determines the time before modulation will
be changed to eliminate the difference between measured and set point.
Band Factor – This setting is how tight to the set point that modulation will
swing. The larger the band, the less swing in modulation.
Derivative Time – This setting determines how sudden the modulation
should change as a result of a change in measured air flow. It attempts to
eliminate “overshooting” the set point.
Assist on Demand – Allows you to set the amount of fan demand where a
standby unit will be requested to run (after the Standby On time setting
described below). For example; if set to 75%, a standby unit will be
requested to turn on when fan modulation reaches a demand of 75%.

Data Aire dap4 Specifications

General

Brand	Data Aire
Model	dap4
Category	Control Systems
Language	English