LINKAGE COORDINATOR CONFIGURATION SCREEN — The Linkage Coordinator Configuration screen allows the user to set the linkage coordinator configuration set- tings. See Table 6.
Linkage Master Zone — This decision defines if the zone controller will function as a Linkage Coordinator (Linkage Master) for itself and other zones.
If the zone controller is to use a supply air sensor for stand- alone operation, this configuration must be configured to No and the number of Zones to 1.
If the zone controller will use its primary air sensor to deter- mine the air handler mode for a number of zone controllers, configure this configuration to Yes, input the number of zones, and leave the air source decisions at the default values of zero.
If this zone controller will communicate linkage informa- tion with an air source, configure this configuration to Yes. The number of zones must be configured and the address of the air source entered.
Linkage |
|
|
Master Zone: | Range | Yes/No |
| Default Value | No |
Number of Zones — This decision defines the number of zone controllers (including itself) for the Linkage Coordinator to scan and include as part of the average temperature, set points, and occupancy information to the air source. The address of the zone controller functioning as a Linkage Coordinator must be larger than the number of zones configured. The zone control- ler will scan addresses less than its own, including information for as many zones as are configured. Other zone controller con- figured as linkage coordinators will also be included, so it is possible to have zones scanned by more than one linkage coor- dinator. Therefore care must be taken in addressing to prevent overlapping systems, unless overlapping systems is necessary. In large buildings the use of bridges and multiple busses is rec- ommended to improve communication and provide system differentiation.
Number of |
|
|
Zones: | Range | 1 to 128 |
| Default Value | 1 |
Air Source Bus and Element Number — The Air Source Bus and Element Number configurations define the address of the air source providing conditioned air to the zones controlled by the linkage coordinator. If the address is left at zero, the Link- age coordinator will look for a primary air sensor to determine the equipment mode. If no primary air sensor is installed, or the sensor fails, the Linkage Coordinator will default the air source mode to Cooling.
Air Source |
|
|
Bus Number: | Range | 0 to 240 |
| Default Value | 0 |
Air Source |
|
|
Element Number: |
| 0 to 240 |
| Default Value | 0 |
Static Pressure Reset — Air systems designed with diversity (airflow required with all zones at maximum cfm exceeds de- sign capacity of air handler) are capable of providing enough CFM to all zones on days when conditions meet the demand at design static. At other times, the air system does not require the design static to meet the load requirements.
Static pressure reset allows the static pressure set point on the air source to be reset whenever the system load is reduced from the design maximum. The zone controller will then moni- tor damper positions. When the system dampers are modulat- ing at lower damper positions due to the higher static, the static pressure will then be reset to a lower value allowing the damp- ers to open more. This allows the system to automatically make adjustments to the static pressure and optimize performance of the fan which will reduce energy consumption.
The linkage coordinator monitors the position of all damp- ers in its system. When any zone’s maximum damper position reaches the Reset Maximum Damper Position, the linkage co- ordinator will reduce the value of the reset variable.
The Maximum Damper Position and Static Pressure Reset values can be viewed on the Linkage maintenance screen.
NOTE: The static pressure set point configured in the air source should be the desired maximum (zero reset) static pressure.
→Table 6 — Linkage Coordinator Configuration Screen
DESCRIPTION | DEFAULT | POINT NAME |
Zone Linkage |
|
|
Linkage Master Zone | No | MZENA |
Number of Zones | 1 | NSYSTZ |
Air Source Bus Number | 0 | ASBUSN |
Air Source Element Number | 0 | ASELEMN |
Static Pressure Reset |
|
|
Reset Minimum Damper Position | 50 % | MINDP |
Reset Maximum Damper Position | 80 % | MAXDP |
Maximum Reset | 0.0 in. wg | SPMAX |
SP Reset Variable Name | (blank) | SPRVAR |
CCN Linkage Data |
|
|
CCN Variable Name | (blank) | CCNVAR |
CCN Function Configuration | 3 | CCNFUNC |
Data Transfer Rate | 10 minutes | DATARATE |
CCN Output Point | (blank) | CCNOUTP |
Destination Bus Number | 0 | DESTBUSN |
Destination Element Number | 0 | DESTELEN |
Temperature Sensor Grouping |
|
|
Temperature Sensor Mode | 1 | BRD_RECV |
Temperature Sensor Configuration | 1 | SENSCFG |
Broadcast Device ID | 1 | BRDDEVID |
801 | 34 |
