Chapter 6 UCMs supported by Tracer Summit systems
58 BMTX-SVN01C-EN
Description of UCM types
Central Control Panel (CCP II) (VariTrac II)
The VariTrac system is a changeover bypass VAV system that controls the
temperature and mode of individual VAV zones, and also stages the roof-
top or air handler that serves the system. VariTrac systems are applied
with the use of a Central Control Panel (CCP II) that provides coordina-
tion, monitoring, and diagnostics for the VariTrac zone system. The CCP
II was formerly referred to as VariTrac II. Its predecessor is the VariTrac
I.) 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 cool-
ing unit to meet those needs.
The CCP II can function as a stand-alone system whereby mode control
functions can be initiated via binary inputs from a time clock or other con-
tact closures. The CCP II can also be controlled and monitored from an
upper level system, such as Tracer Summit system, via a connection to
the BCU. The CCP II uses an isolated Comm3 communication link when
it is connected to the BMTX BCU.
For information about the number of CCP IIs allowed per BCU and per
communication link, refer to Table 5 on page 33.
The following information summarizes the compatibility of the CCP II
and VariTrac I with a Tracer Summit system:
• VariTrac I comfort managers are not compatible with a Tracer Sum-
mit system, and they cannot communicate with a Tracer Summit sys-
tem.
• CCP IIs using boards with revision levels 1 to 10 cannot be upgraded
to software Version 2.2. The Version 2.2 chip is only compatible in
revision level 11 boards or greater.
• CCP IIs with boards manufactured prior to revision level 11 cannot
communicate with a Tracer Summit system until the CCP board is
replaced. Contact your local Trane sales office for instructions.
• CCP IIs using boards with revision levels 11 to 14 can be upgraded to
software Version 2.2 by replacing the chip in location U-27.
• CCP IIs using boards with revision levels 15 and greater already
come equipped from the factory with software Version 2.2 and are
fully compatible with a Tracer Summit system.
• The approximate manufacturing dates for CCP boards are:
February 20, 1996: The CCP II board transitioned from revision level
10 to 11. Both board revisions were available with software Version
2.1; however, the PROM chip on each board (location U-27) was phys-
ically different.
December 22, 1997: The CCP IIs transitioned from revision level 14 to
15. The software version transitioned from 2.1 to 2.2 on the same
date.
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