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VAV-PRC011M-EN 81

DDC Controls

the heat of the main AHU to keep plumbing lines from freezing. When available, the operation of

the VAV unit fan (series or parallel) remains unaffected.

Controller Flexibility

• 24 VAC binary input that can be configured as a generic input or as occupancy input. When the

DDC controller is operating with a Tracer ™ SC, the status of the input is provided to Tracer for

its action. In stand-alone operation and when configured for an occupancy input, the input will

control occupancy status of the DDC controller.

• Auxiliary temperature analog input configured for an auxiliary temperature sensor. When

sensor is mounted in the supply air duct, the value of the input is used as status-only by Tracer

SC if Tracer SC is providing a supply air temperature to the DDC controller. Otherwise, the input

will be used for determining heating/cooling control action of the VAV unit. When the auxiliary

temperature sensor is located in the discharge of the unit, and attached to a Trane Tracer SC

BAS, additional test sequencing and reporting is available to maximize VAV system capabilities

and simplify system commissioning.

• Dual-duct support with two DDC controllers. One DDC controller controls the cooling air valve

and the other controller controls the heating air valve. With constant-volume sequences, the

discharge air volume is held constant by controlling discharge air volume with the heating

Controller.

• Tracer™ UC400 or UC210 Programmable BACnet

Controller certified performance ensures

that a Trane VAV with controller will provide state-of-the-art, consistent open communication

protocol for integration with the industry’s latest (Non-Trane) building automation control

systems, including Johnson Control, Andover, Siemens, Honeywell, etc.

•CO

demand controlled ventilation enables a HVAC system to adjust ventilation flow based on

the measured CO2 concentration in the zone. Trane demand controlled ventilation strategies

are pre-defined for simplified application and can be easily customized to meet the needs of a

specific system.

Trane DDC VAV Controller Logic with UC210 or UC400 Controls

Control Logic

Direct Digital Control (DDC) controllers are today’s industry standard. DDC controllers share

system-level data to optimize system performance (including changing ventilation requirements,

system static pressures, supply air temperatures, etc.). Variables available via a simple twisted-

shielded wire pair include occupied/unoccupied status, minimum and maximum airflow setpoints,

zone temperature and temperature setpoints, air valve position, airflow cfm, fan status (on or off),

fan operation mode (parallel or series), reheat status (on or off), VAV unit type, air valve size,

temperature correction offsets, flow correction values, ventilation fraction, etc.

With the advent of Tracer UC400 open protocol, the most reliable VAV controller is now available

for ANY system. Gone are the days of being locked into a single supplier. Trane DDC controllers

provide Trane-designed solid-state electronics intended specifically for VAV applications including:

1. Space Temperature Control

2. Ventilation Flow Control (100% outside air applications)

3. Flow Tracking Space Pressurization Control (New feature)

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