Data Aire dap4 User Manual page 76

MENU M – Set Zone Master (continued)
Each unit in the zone must be assigned a mode of Standby (Stdby/Stdby1)
or Off as described below. Note: More units may be displayed than are in
the zone, their setting makes no difference.
Stdby (default) - Allows the master to request the standby unit to run due to
one of these four causes:
1. 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.
2. 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.
3. To satisfy the airflow "Assist On Demand" setting (when fan mode set
to "C Airflow"). Should the master modulate the fans of all running units
greater than this setting, the master will request additional standby units
to turn on.
4. 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.
Prior - Priority mode operates the same as the standy mode described
above, except it has first priority in the staging order. After all units in
priority mode are requested to run, the master will begin staging the normal
standby units.
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.
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