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78 VAV-PRC011M-EN

Dual-Duct VAV Terminal Units

differential pressure signal from the pressure transducer. Additionally, the controller can monitor

either supply duct air temperature or CO2 concentration via appropriate sensors. The controller is

provided in an enclosure with 7/8" (22 mm) knockouts for remote control wiring. A Trane UCM zone

sensor is required.

DDC Zone Sensor—The UCM controller senses zone temperature through a sensing element

located in the zone sensor. In addition to the sensing element, zone sensor options may include an

externally-adjustable setpoint, communications jack for use with a portable edit device, and an

override button to change the individual controller from unoccupied to occupied mode. The

override button has a cancel feature that will return the system to unoccupied. Wired zone sensors

utilize a thermistor to vary the voltage output in response to changes in the zone temperature.

Wiring to the UCM controller must be 18 to 22 awg. twisted pair wiring. The setpoint adjustment

range is 50–88ºF (10–31°C). Depending upon the features available in the model of sensor selected,

the zone sensor may require from a 2-wire to a 5-wire connection. Wireless zone sensors report the

same zone information as wired zone sensors, but do so using radio transmitter technology.

Therefore with wireless, wiring from the zone sensor to the UCM is unnecessary.

Digital Display Zone Sensor with Liquid Crystal Display (LCD)—The digital display zone sensor

contains a sensing element, which sends a signal to the UCM. A Liquid Crystal Display (LCD)

displays setpoint or space temperature. Sensor buttons allow the user to adjust setpoints, and

allow space temperature readings to be turned on or off. The digital display zone sensor also

includes a communication jack, for use with a portable edit device, and an override button to

change the UCM from unoccupied to occupied. The override button has a cancel feature, which

returns the system to unoccupied mode.

System Communications—The Controller is designed to send and receive data from a Tracer™ SC

or other Trane controllers. Current unit status conditions and setpoints may be monitored and/or

edited via this data communication feature. The network type is a twisted wire pair shielded serial

communication.

Pneumatic Controls

Normally-Open Actuator—Pneumatic 3 to 8 psig (20 to 55 kPa) spring-range pneumatic actuator.

Normally-Closed Actuator—Pneumatic 8 to 13 psig (55 to 90 kPa) spring-range pneumatic actuator.

3011 Pneumatic Volume Regulator (PVR)—The regulator is a thermostat reset velocity controller,

which provides consistent air delivery within 5% of cataloged flow down to 18% or less of unit

cataloged cfm, independent of changes in system static pressure. Factory-calibrated, field-

adjustable setpoints for minimum and maximum flows. Average total unit bleed rate, excluding

thermostat, is 28.8 scim at 20 psig (7.87 mL/min at 138 kPa) supply.

3501 Pneumatic Volume Regulator (PVR)—The 3501 regulator is a linear reset volume controller.

This PVR is used to maintain a constant volume of airflow from the dual-duct unit when constant

volume control is used. Average total unit bleed rate, excluding thermostat, is 43.2 scim at 20 psig

(11.8 mL/min at 138 kPa) supply.

Control Options

Tr a n s f o r m e r — The 50-VA transformer is factory-installed in an enclosure with 7/8" (2 mm)

knockouts to provide 24 VAC for controls.

Disconnect Switch – A toggle disconnect disengages primary power to the terminal.

Fuse – Optional fuse is factory-installed in the primary voltage hot leg.

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