Trane VAV-SLM002-EN manual VariTrac Function Overview, Digital Display Zone Sensor

Digital Display Zone Sensor

The new digital display zone sensor has the look and functionality of the standard Trane zone sensor, but includes an LCD digital display of the space temperature and setpoint adjustment in degrees F or C. The sensor has ON and CANCEL buttons, and a communications jack which can be accessed without removing the cover. The sensor requires 24 volts, and may share a power supply with UCM.

Zone Occupancy Sensor

The new zone occupancy sensor is a ceiling-mount infrared motion detector to be used with VariTrac zone damper UCM for controlling the occupied zone standby function. It can detect motion over a 360 degree range (adjustable) for up to a 1200 square foot area. It has SPDT isolated contacts for connection to the UCM occupancy input. The sensor requires 24 volts, and may share a power supply with UCM.

Zone CO2 Sensor

The zone CO2 sensor is a compact transmitter for use with the VariTrac UCM CO2 input for doing demand control ventilation. The sensor is a available in either wall- or duct-mount enclosures. The sensor requires 24 volts, and may share a power supply with UCM.

VariTrac PC Software

Advanced set-up functions in VariTrac are now done with a new Windows®-based, graphical PC software program. Connection between the PC and the CCP is done with a standard serial port cable connection.

VariTrac Function Overview

Increased Zone Count

The new VariTrac system now support 24 zones instead of 16. The zones may be VariTrac dampers, or any type of VariTrane VAV box including fan-powered boxes or boxes with factory-installed local heat.

Automatic Configuration and Start-up

The VariTrac system performs automatic configuration on start-up by locating all zone dampers or VAV boxes on the communications link and creating a database of zones, complete with default names. VariTrac takes control of all the zone dampers and calibrates them. It then calibrates the bypass system, establishes its own static pressure setpoint, and begins heating/cooling operation.

Discharge Air Control

VariTrac now does discharge air control. When there is a demand for heating or cooling from a zone, the CCP will control the discharge air temperature to the discharge air setpoint default (55°F cooling, 110°F heating), using as many stages as necessary. This allows VariTrac to do true capacity control under part-load conditions, and better manage the load created by increased ventilation air requirements.

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