Capacity Assist; Capacity Assist #2; Group Sensors - Black Box CRCW-12 User Manual

The Service>Options>Group Setup screen allows you to select the workgroup duty assignment for the A/C unit. The duty must
be assigned for each grouped A/C unit at its local display terminal.
Enter the number of days between rotating active units.
Enter the hour of day for unit rotation to occur.
The screen also displays a status message indicating which A/C unit you are accessing and which unit is currently the lead unit in
the group.

4.6.2.7.2 Capacity Assist

The first Service>Options>Capacity Assist screen allows you to enter the delay period for the unit to begin operating if it is in the
capacity assist mode. Also, each A/C unit in the group may be assigned local cut-in and cut-out setpoints for its capacity assist
operation. The values entered are offsets, which are applied to the control setpoints.
Each unit in the group should be assigned incrementally increasing/decreasing offsets for cooling, humidifying, and dehumidifying
so they will turn on one at a time only if the unit(s) currently operating are unable to satisfy the demand.

4.6.2.7.3 Capacity Assist #2

The second Service>Options>Capacity Assist screen allows you to adjust local capacity assist humidification and dehumidification
setpoints.

4.6.2.7.4 Group Sensors

The lead controller polls the controllers from all the A/C units in the workgroup and calculates the averaged value of their
temperature sensors and humidity sensors. It also determines the minimum (lowest) temperature sensor value and the lowest
humidity sensor value in the A/C group and, conversely, determines the maximum (highest) temperature sensor value and
maximum humidity sensor value in the A/C group.
Figure 4-92. Capacity Assist screen.
Figure 4-93. Capacity Assist #2 screen.
Figure 4-94. Group Sensors screen.
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Chapter 4: E2 Controller
Page 93