Trane Round In/Round Out Detailliste PDF herunterladen (Seite 80)

80 VAV-PRC011M-EN

DDC Controls

• When combined with the patented Trane Flow ring and pressure transducer, flow is repeatable

to +/- 5% accuracy across the Pressure Independent (PI) flow range. (See Valve/Controller

Airflow Guidelines section).

• Improved 2-Point Air Balancing is available – Assures optimized flow-sensing accuracy across

the operating range. This provides a more accurate airflow balancing method when compared

to typical single-point flow correction air balancing.

• Analog input resolution of +/- 1/8°F within the comfort range maximizes zone temperature

control yielding excellent comfort control.

Reliable Operation

• Built for life – Trane products are designed to stand the test of time, with a proven design life

that exceeds 20 years.

• Fully factory tested – fully screened and configured at the factory. All features are tested

including fan and reheat stage energization, air valve modulation, and controller inputs and

outputs.

Safe Operation

• All components, including the controller, pressure transducer, transformer, etc. are mounted

in a NEMA 1 sheet metal enclosure and are tested as an assembly to UL1995 standards. The

result is a rugged and safe VAV, controller, and thus, overall unit.

• When in PI-mode, EH is disabled when the sensed flow is below the minimum required.

• HW coil VAV units in ventilation flow control (VFC) have a Freeze protection algorithm to protect

the water coil and the internal space from water damage. This is accomplished by driving the

water valve to maximum position on alarm conditions.

System-Level Optimization

Trane controllers are designed to integrate into Trane Tracer™ Building Automation Systems and

leverage clear and clean unit-controller related data for system level control decisions. Integrating

a Trane VV550 controller into a Tracer SC Control System provides the next step in building system

control.

Specifically, system-level decisions on how to operate all components can be made. Energy

efficient optimization strategies like Static Pressure Optimization, Ventilation Reset, and CO

Demand-controlled Ventilation can be employed with the simple press of a button. The end-result

is the most efficient and reliable building control system available.

Simplified Installation

Factory Commissioned Quality – All Trane DDC VAV controllers are factory-commissioned. This

means that the DDC boards are powered and run-tested with your specific sequence parameters.

They are connected to a communication link to make sure that information and diagnostic data

function properly. Before any VariTrane™ VAV unit ships they must pass a rigorous quality control

procedure. You can be assured that a Trane VAV unit with Trane DDC VAV controls will work right

out of the crate.

Zone sensor air balance

– When applied to a Trane zone sensor with thumb-wheel and on/cancel

buttons, a balancing contractor can drive the primary air valve to maximum or minimum airflow

from the sensor to determine the point of calibration to be used (maximum will result in optimum

performance). The flow reading can then be calibrated from the sensor, without the use of

additional service tools. (Non-LCD versions)

Tenant-Finish Heat Mode

– In some office projects, the building is being constructed as tenants are

being identified. Tenant-finish heat mode is designed for applications when a given floor has not

been occupied. The main AHU system is used for heat and because the internal furnishings are not

complete, the sensors have not been installed. In this case, the primary valve drives open using

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