Data Aire dap4 User Manual page 98

Zone Master Operation (continued)
Unit Settings - Standby mode (default) or Prior mode allows the master to request
the unit to run due to one of these four causes:
To satisfy the minimum "Number Units On" setting. Based on this setting and the
current lead unit, the master may request the unit to be on.
To satisfy the "Temperature Assist" feature (if enabled). If the average zone
temperature gets too high, the master will request additional standby units to turn
on.
To satisfy the airflow or air pressure feature (if enabled) the "Assist On Demand"
setting will allow additional standby units to run. Should the master modulate the
fans of all running units greater than this setting, the master will request additional
standby units to turn on.
To fill in for another unit that has an alarm, the master has selections for "Standby
Alarms". These selections determine which alarms the unit will send to the master.
(The alarm selections are described later in this section). The master will then
request a standby unit to turn on without delay. When the alarm condition is
corrected on the unit that had the alarm, the master may request it to turn back on
and return the requested unit to standby
Unit Settings - The OFF mode This mode does not allow the master to turn the unit
on for any reason. It is normally only used when a unit is being serviced or if the unit
is an unused spare. When a unit is set to OFF, it is not included in the rotation nor is
it affected by the schedule.
Rotation: To even out runtime among standby units, a scheduled rotation of the lead
unit may be chosen. The available selections are:
None - Rotation is disabled and the lead unit will not change. The lead unit
selection will appear instead of the rotation timing selections below.
Every 8 Hrs, Every 12 Hrs, Every 16 Hrs - Rotation will occur at the
selected time increment beginning from when the increment is selected. It is
not based on the clock hour status.
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