Trane Round In/Round Out Lista de Peças descarregar pdf (Página 93)

VAV-PRC011M-EN 93

DDC Controls

savings of a VAV system. A flow tracking system in a given zone consists of a standard Space

Comfort Control VAV (see B) unit plus a single-duct, cooling-only, exhaust VAV unit (see C). As the

supply VAV unit modulates the supply airflow through the air valve to maintain space comfort, the

exhaust box modulates a similar amount to maintain the required CFM differential. This is a simple,

reliable means of pressurization control, which meets the requirements of the majority of zone

pressurization control applications. Typical applications include:

• School and University laboratories

• Industrial laboratories

• Hospital operating rooms

• Hospital patient rooms

• Research and Development facilities

•And many more…

The CFM offset is assured and can be monitored and documented when connected to a Trane

Tracer Building Automation System. Flow Tracking Control is designed to meet most pressurization

control projects. If an application calls for pressure control other than flow tracking, contact your

local Trane Sales Office for technical support.

LONMARK Direct Digital Controller—Unit Control Module (VV550)

Figure 5. How does it operate?

Exhaust

Communication link

Supply VAV

To other VAVs or

Main Control Panel

How Does It Operate?

Primary Air

from Main

AHU

Occupied Space

The Trane LONMARK

direct digital controller Unit Control Module (DDC-

UCM) is a microprocessor-based terminal unit with non-volatile memory

which provides accurate airflow and room temperature control of Trane and

non-Trane VAV air terminal units. provides a simple open protocol to allow

integration of Trane VAV units and controls into other existing control

systems. The UCM can operate in pressure-independent or pressure-

dependent mode and uses a proportional plus integral control algorithm.

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Trane Round In/Round Out Lista de Peças Página 93