
VAV-PRC011M-EN 85
DDC Controls
provide unmatched “peace of mind” by calling/paging the appropriate person(s) when specific
alarms occur.
Flow Tracking Control
This enhanced VAV DDC controller feature allows two Trane VV550 controllers to coordinate
modulation simultaneously. This allows a specific CFM offset to be maintained. The CFM offset
provides pressurization control of an occupied space, while maintaining the comfort and energy
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.
Figure 3. How does it operate?
B
A
C
Exhaust
Communication link
Supply VAV
To other VAVs or
Main Control Panel
How Does It Operate?
T
Primary Air
from Main
AHU
Occupied Space
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