Chapter 5 UCM Wiring and Addressing
120 BMTW-SVN01F-EN
VariTrac II Central Control Panel (CCP)
Interface
Description
The VariTrac system is a changeover bypass VAV system that controls
the temperature and mode of individual VAV zones, and also stages the
rooftop or air handler that serves the system. VariTrac systems are
applied with the use of a VariTrac II central control panel (CCP) that pro-
vides coordination, monitoring, and diagnostics for the VariTrac zone sys-
tem. It is responsible for communicating with, and the grouping of, up to
16 VAV units to determine space heating and cooling requirements, as
well as for selecting the mode and number of stages for the heating and
cooling unit to meet those needs.
The VariTrac II CCP can function as a standalone UCM whereby mode
control functions can be initiated via binary inputs from a time clock or
other contact closures. The VariTrac II CCP can also be controlled and
monitored from an upper level system, such as Tracer Summit, via a con-
nection to the BCU.
For information about the number of VariTrac II CCPs allowed per BCU
and per communication link, refer to Table 7 on page 46.
The following information summarizes VariTrac I and II compatibility
with Tracer Summit:
• VariTrac I comfort managers are not compatible with Tracer Summit,
and they cannot communicate with Tracer Summit.
• The VariTrac II CCP must use software version 2.2 to communicate
with Tracer Summit. CCPs with versions 1.x, 2.0, or 2.1 will not com-
municate with Tracer Summit. All future CCP software versions will
be Tracer Summit-compatible.
• VariTrac II CCPs using boards with revision levels 1 to 10 cannot be
upgraded to software version 2.2. The version 2.2 chip is only compat-
ible in revision level 11 boards or greater.
• CCPs with boards manufactured prior to revision level 11 cannot
communicate with Tracer Summit until the CCP board is replaced.
Contact your local Trane sales office for instructions.
• VariTrac II CCPs using boards with revision levels 11 to 14 can be
upgraded to software version 2.2 by replacing the chip in location
U-27.
• VariTrac II CCPs using boards with revision levels 15 and greater
already come equipped from the factory with software version 2.2 and
are fully compatible with Tracer Summit.
To Next Page
Loading...
Need help?
General
