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VAV-PRC011M-EN 79

DDC Controls

Tracer UC400 and UC210 Programmable BACnet Controllers

The Tracer™ UC400 and UC210 controllers are programmable general purpose BACnet

microprocessor-based, Direct Digital Controllers (DDC). When factory installed on Trane (Variable

Air Volume) VAV terminal units, they are factory downloaded with appropriate VAV programs and

configuration settings. Trane VAV units have been made with either pneumatic, analog electronic,

or microprocessor controls (DDC VAV). UC400 is not an option on Dual Duct.

The Tracer UC400 or UC210 controller can be configured from the factory with three different

application programs: Space Temperature Control (STC), Ventilation Flow Control (VFC), and Flow

Tracking Control (FTC).

The Tracer UC400 or UC210 controller programmed for STC modulates a VAV's damper blade

based on a zone temperature, measured airflow, and setpoints to continuously control conditioned

air delivery to the space. The volume of incoming air is monitored and the damper adjusts to

provide accurate control independent of the duct pressure. The damper modulates between

operator setpoints depending on space conditions. Additionally, fan and heat outputs may be

energized depending on the application.

The Tracer UC400 or UC210 controller configured for VFC can be applied to a VAV terminal and used

to temper cold outdoor air (OA) that is brought into a building for ventilation purposes. The

tempered air is intended to supply an air-handling unit (AHU), which provides comfort control to

the zones it is serving. The VAV terminal supplies the correct amount of ventilation air, and when

reheat is added, tempers the ventilation air to reduce the load on the air handler by sensing the

discharge air temperature of the VAV unit and controlling its long-term average to the discharge

air temperature setpoint.

The Tracer UC400 or UC210 controller can be configured for FTC and has two VAV units with Tracer

UC400 or UC210 controllers working together to provide flow tracking control. One Tracer UC400

or UC210 controller is configured from the factory with the Space temperature program and the

other is downloaded with the FTC program. The STC airflow output is bound to the flow tracking

controller airflow setpoint input. The flow tracking controller adds the configured airflow tracking

offset (positive or negative) to the airflow setpoint (communicated airflow setpoint) and controls

the airflow to this setpoint.

The Tracer UC400 or UC210 controller is BTL compliant with BACnet, an open standard building

automation protocol. It meets the Application Specific Controller (ASC) profile per ASHRAE 135-

2004. This allows the Tracer UC400 controller to integrate with other BACnet systems.

Available Inputs

Inputs include a twisted/shielded communication link, zone sensor, duct temperature sensors

(optional), Occupancy Sensor (optional), Discharge Air Temperature (DAT) and/or Supply Air

Temperature (SAT), CO2 sensor, and 24 VAC power. In addition to the points used for the VAV

application, the spare inputs and outputs on the Tracer UC400 controller may be used for ancillary

control, which can be programmed using Tracer TU Tracer Graphical Programming 2 (TGP2).

Note: For more information on using spare points, see BAS-SVX20*-EN Tracer UC400

Programmable Controller Installation, Operation, and Maintenance.

General Features and Benefits

Assured Accuracy

• Proportional-plus-integral control loop algorithm for determining required airflow needed to

control room temperature. Airflow is limited by active minimum and maximum airflow

setpoints.

• Pressure-independent (PI) operation that automatically adjusts valve position to maintain

required airflow. In certain low-flow situations or in cases where the flow measurement has

failed, the DDC controller will operate in a pressure-dependent (PD) mode of operation.

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