Operation Of Zone Master - Data Aire dap4 User Manual

Operation of Zone Master

Zone Master is an optional feature that offers a dap4 control teamwork solution.
Up to sixteen dap4 units may be arranged in the Zone Master network. Each unit
in a zone is given a unique sequential network address. The unit at address 1 is
designated as the master and 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
The master can request additional standby units to run in the event of an alarm
condition (customizable) or if the master cannot meet the demand for cooling,
airflow or static air pressure.
To even out run time between units, the master has a rotation schedule that will change
which unit is in the lead. Beginning with the lead unit, the master will stage units 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. The master will not stage any unit 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 Master is broken, all units will operate independently
using their own setpoints. If the unit was in standby, it will turn on. The message "Master
(U1) has Gone Offline" will displayed on each slave unit.
If communication is lost between the Master and a slave unit (for example Unit #3), the
master will display "Unit 3 is Offline". The Master will exclude Unit 3 from its average
temp/hum calculations and remove it from rotation. As a result of the slave unit going off-
line, the Master may request another unit to take its place.
95