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zone controller can be configured as a broadcaster of its sensor

or a receiver of another zone’s sensor information. Zone con-

trollers sharing a common sensor must all be installed on the

same CCN bus. Sharing of sensor information cannot be ac-

complished through bridges.

SENSOR GROUPING

A zone controller that is set up as a Linkage master has the

ability to poll its slave controllers and collect the high, low or

average value of any variable within its slave controllers. Once

the high, low or average is determined, the master can then

transfer that value to a configured bus number, element number

and point name. Typically this feature is used to determine a

system’s highest indoor air quality reading for use in a Demand

Controlled Ventilation (DCV) system.

In order to utilize this feature, the CCN Variable Name be-

ing collected from the slave controllers must be supplied. Also

the data transfer rate must be specified and whether the high,

low or average value is being calculated. Finally, a valid point

name and CCN address must be entered.

CALIBRATION

The zone controller provides a Commissioning mode that

calibrates the damper position feedback sensor and the airflow

sensor. This commissioning should be performed once when

the terminal is installed. In addition, the zone controller will

perform an ongoing auto-calibration of the airflow sensor to

maintain airflow measurement accuracy. Refer to installation

and start up instruction for more details.

CCN ALARMS

The zone controller will support the detection of alarm con-

ditions and the reporting of those conditions through the CCN

communication network. No local indication of any alarms will

be provided at the zone controller itself. Alarms will be routed

to CCN devices as required by setting the appropriate routing

bits in the alarm routing configuration. No alarms will be

transmitted if alarm routing is set to 00000000 (default). The

control implements and uses a standard alarm configuration

table, specifying routing, re-alarm, etc. Alarms use level 6

(control) for limit-exceeded alarms, and level 2 (service) for all

other alarms. Alarm activity is stored in an Alarm History

Table, containing the 5 most recent alarm messages. The fol-

lowing CCN alarms and associated return to normal messages

are be supported.

Space Temperature Limit Alarm

—

During occu-

pied periods, an alarm value is used to define the allowable de-

viation from set points before an alarm condition is detected.

This value is added to the occupied cooling set point and sub-

tracted from the occupied heating set point during occupied pe-

riods. This allows the set points to be easily changed without

having to change the alarm limits. During normal steady state

operation, whenever the space temperature deviates outside of

this defined range, a timer will begin. If after 5 minutes the

alarm condition still exists, the alarm will be generated. An

alarm value of 1 degree F (non-adjustable) is used to determine

when the space temperature has returned to normal.

During unoccupied and biased start periods, the alarm set

points are defined by two configured values (unoccupied low

and unoccupied high). The alarm detection and return to nor-

mal operates as specified above for occupied conditions, ex-

cept unoccupied alarm values are used.

To prevent false alarms during a transition from Unoccu-

pied or Biased Occupied operation to Occupied operation (or if

a set point is changed), an alarm delay is calculated each time

the control set point changes. The value of the delay is equal to

15 minutes, plus 15 minutes per degree difference between the

new heating or new cooling set point and the current space

temperature. The alarm delay has a maximum value of 255

minutes.

Linkage Failure (Failure to Communicate With

Linkage Master)

—

If a terminal has established com-

munications from a linkage master, then the linkage master will

exchange information with each of the configured zones each

Fig. 5 — Occupancy Schedule Information Screen

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