Trane Round In/Round Out Seznam dílů stáhnout pdf (Strana 89)

VAV-PRC011M-EN 89

DDC Controls

• 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 SC 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

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 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 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.

• LonMark 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.

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