Carrier Understanding Linkage Coordinator Configuration for Your Air Conditioner

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

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