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90 VAV-PRC011M-EN

DDC Controls

•CO

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

the current CO

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 VV550 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 LonMark 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:

4. Space Temperature Control

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

6. Flow Tracking Space Pressurization Control (New feature)

Note: Flow sensor DP (in. wg) is measured at the flow ring to aid in system balancing and commissioning. See “Valve/Controller

Airflow Guidelines” in each section for unit performance.

Space Temperature Control

Space temperature control applications are where Trane emerged as an industry leader in quality

and reliability. This did not occur overnight and has continued to improve as our controller and

control logic has improved over time. STC employs controller logic designed to modulate the

supply airstream and associated reheat (either local or remote) to exactly match the load

requirements of the space.

Additionally, minimum and maximum airflow and specific controller sequence requirements are

pre-programmed to ensure that appropriate ventilation standards are consistently maintained.

When connected to a Trane Tracer SC control system, trend logging, remote alarming, etc. are

available to fully utilize the power and capabilities of your systems.

Figure 4. Flow sensor single vs. airflow delivery

0.01

0.1

10 100 1,000 10,000

Cfm

Flow Sensor DP (In. wg)

12"

10"

8"6"

14"

16"

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