Operation of Zone Control
Zone Control is an optional feature that offers a dap4 control teamwork solution.
Up to sixteen dap4 units may be arranged in the Zone Control network. Each unit
in a zone is given a unique sequential network address. Unit 1 (unit at address 1)
has menus with selectable features of:
• Minimum number of units that must always be on
• Automatic lead/lag and standby unit rotation
• Activate a standby unit due to an alarm condition
• Deactivate a running unit due to an alarm condition
• Activate one or more standby units to assist with controlling temperature
• Inhibit certain control functions to prevent units from conflicting operations
• Primary and secondary schedules for economical control
• Unified zone airflow control
Unit 1 can request additional standby units to run in the event of an alarm
condition (customizable) or if it cannot meet the demand for cooling, airflow or
static air pressure.
To even out run time between units, Unit 1 has a rotation schedule that will change
which unit is in the lead. Beginning with the lead unit, additional units will stage on
that are capable of running (i.e. not off by Keypad or due to an alarm). Units in the
Priority mode will stage on before units in the Standby mode. Units will not be
staged on if set to the Off mode. For even greater flexibility, a secondary mode
may be used so that units can have a deferent mode based on a time schedule.
Note: If communication of the Zone Control is broken, all units will operate
independently using their own setpoints. If the unit was in standby, it will turn on.
The message “U1 has Gone Offline” will displayed on each unit.
If communication is lost between U1 and one other unit (for example Unit #3), the
display “Unit 3 is Offline” will be indicated on Unit 1. Unit 3 will be excluded from
the average temp/hum calculations and be removed from rotation. As a result of
the unit going off-line, Unit 1 may request another unit to run in its place.
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