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VAV-PRC003-EN 5
VariTrac Zone
Damper
Zone Sensor
HVAC
Unit
Communicating
Bypass
Controller
VariTrac Central Control
Panel with touchscreen
interface
Bypass
Damper
VariTrac Central Control Panel (CCP)
The CCP is the system level controller which
coordinates and monitors VariTrac system
operation, including HVAC system supply
pressure and airflow, heating/cooling mode,
supply air temperature, all zone temperatures and setpoints,
fan mode, economizer position (when paired with CO
2
demand controlled ventilation), time-of-day scheduling, zone
grouping logic, system override mode (after hours
operation), and much more.
Bypass Damper w/ Wire and Quick Connect
A round or rectangular damper ducted
between the HVAC supply and return ducts. It
is easily connected via a “quick-connector”
which provides quick and consistent field wiring. The bypass
damper is modulated by the CCP to maintain required system
static pressure.
Zone Sensor
Zone sensors (sometimes referred to as
thermostats) measure space temperature and
report it to the zone damper controller (UCM).
Five models are available to satisfy varied aesthetic and
application preferences.
HVAC Unit
VariTrac changeover bypass systems
operate with Trane and non-Trane products,
including split systems, packaged rooftop
units, and water-source heat pumps. These
systems are generically referred to as HVAC
(heating, ventilating, and air conditioning)
units. When combined with a Trane
packaged rooftop with ReliaTel™ controller,
wiring, installation, and system startup
efficiency is maximized by connecting with a
simple twisted shielded wire pair.
Communicating Bypass Controller
A single enclosure with duct temperature sensor,
static pressure sensor, and communicating
controller (UCM) which easily mounts on the
supply ductwork. The UCM provides power to
drive the bypass damper actuator.
Rooftop
Split System
WSHP
Figure 3. VariTrac changeover-bypass VAV system components
5
Features and
Benefits