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2 VAV-SLM002-EN
The VariTrac History
Trane brought their expertise in variable air volume (VAV) controls into
the changeover-bypass zoning market with the introduction of VariTrac in
1989. The concept of changeover-bypass zoning brings the flexibility
and comfort of VAV systems into the light commercial unitary market, at
an affordable price.
The first generation of VariTrac was a 16-zone pressure dependent
system. The zone dampers featured the same electronic zone controller
Trane developed for its VAV boxes, operating in the pressure dependent
mode. The heart of the system was the Comfort Manager™; a panel
which was designed to manage the HVAC unit, bypass damper
functions, and changeover decisions. The functional concept of this
original system continues to be the backbone of today’s zoning system.
In the early 90s, two important enhancements were added to the system:
• Trane’s new Comm 4 communications link for the damper controllers
• The ability to directly communicate with Trane’s new Voyager UCP
electronic rooftop unit controls
In 1995, Trane introduced the second generation of VariTrac. This
generation featured the central control panel (CCP) as the functional
replacement for Comfort Manager. The new panel featured a resin
enclosure, optional relay board for 24 VAC unit control, and the move to
static pressure for bypass control. Improved changeover control was
added to the operating system, and the zone damper controls were
upgraded to UCM Version 3.
Now, in 2002, Trane introduces the next generation of VariTrac controls
which includes all the great features of the original VariTrac system, plus
new features and enhancements. The enhancements are designed to
make this generation of VariTrac the simplest changeover-bypass zoning
system to install, commission, and service of any light commercial
controls system available today.