Zone Control Operation (continued)
Unit Settings:
Standby mode (default) allows Unit 1 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, Unit 1 may request the unit to be on.
To satisfy the “Temperature Assist” feature (if enabled). If the average zone
temperature gets too high, Unit 1 will request additional standby units to turn on.
To satisfy the airflow or air pressure demand (if enabled) the “Assist On Demand”
setting will allow additional standby units to run. If the fan modulation exceeds this
setting, additional standby units will be turned on to assist.
To fill in for another unit that has an alarm, Unit 1 has selections for “Standby
Alarms”. These selections determine which alarms Unit 1 will request a standby
unit to turn on without delay. When the alarm condition is corrected on the unit
that had the alarm, it may to turn back on and return the requested unit may
return to standby.
Priority mode operates the same as the standby mode described above, except
it has priority in the staging order. After all units in priority mode are requested to
run, normal standby units will begin staging on. This feature allows units with
air/water economizers or other equipment to come on first.
Unit Settings - The OFF mode This mode does not allow the unit to be turned 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.
Day & Time: Chose every day or the weekday for rotation, then the time of day it
should occur.
Zone Control Operation (continued)
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