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VAV-PRC003-EN 7
Figure 6. VariTrac central control panel
with optional operator display
Features and
Benefits
Central Control Panel
The VariTrac central control panel (CCP)
serves as the central source of
communications and decisionmaking
between the individual zones and the
HVAC unit. The CCP determines system
heating and cooling modes and
coordinates the system supply air
temperature and static pressure to
satisfy building thermal load
conditions. Inputs to the CCP include
24VAC power and communication
wiring to the zone dampers and bypass
control.
Binary inputs consist of priority
shutdown and occupied/unoccupied
modes. Heating, cooling, and the HVAC
unit fan on split systems and non-Trane
HVAC units can be controlled through
binary outputs on an accessory relay
board. If a Trane rooftop air conditioner
with factory-installed electronic
controls is used, the CCP can control
heating, cooling, and the fan with a two-
wire communication link tied to an
interface board mounted in the rooftop.
It can also display status information
from the electronic controller in the
rooftop. (See Figure 4.)
Optional Operator Display
The optional operator display is a
backlit, liquid crystal display with touch-
screen programming capability.
The operator can access system and
zone status through the display and
perform basic setup of zone VAV UCMs
and CCP system operating parameters.
The display allows an installer to
commission a VariTrac system without
using a PC. The operator display has a
seven-day time clock for stand-alone
scheduling capability.
Operator Display Feature Summary
• Backlit LCD touch-screen display for
easy operator interface
• Combination of icon- and menu-based
navigation provides intuitive operation
• Provides a level of control for the daily
operator, and a second level for
commissioning and service
• Three levels of security are available to
protect system settings
• Seven-day time clock for stand-alone,
time-of-day scheduling
CCP Feature Summary
• Communicates with up to 24 VAV unit
control modules (UCMs)
• Makes optimal heating and cooling
decisions based on setpoint and
temperature information received from
individual zones
• Automatically calibrates all dampers,
significantly reducing labor-intensive
and costly field calibration
• Windows-based PC software simplifies
setup and control
• Provides diagnostic information for all
system components via the operator
display or PC software
• Provides status and diagnostic
information for Trane HVAC units
equipped with Trane ReliaTel or UCP
electronic controls
Figure 5. VariTrac central control panel
Figure 4. A screen representation
from the central control panel
illustrating system status