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62 VAV-PRC011M-EN

Single-Duct VAV Terminal Units

Airflow Switch— An air pressure device designed to disable the heater. This is standard on single-

duct with electrical reheat units.

Line Fuse—An optional safety fuse located in the line of power of the electric heater to prevent

power surge damage to the electric heater.

Disconnect Switch—A optional factory-provided door interlocking disconnect switch on the heater

control panel disengages primary voltage to the terminal.

Unit Controls Sequence of Options

Unit controller continuously monitors zone temperature against its setpoint and varies primary

airflow as required to meet zone setpoints. Airflow is limited by minimum and maximum position

setpoints. Upon further call for heat after the air valve reaches the minimum airflow setting, any

hot water or electric heat associated with the unit is enabled.

Direct Digitals Controls

DDC Actuator—Trane 3-wire, 24-VAC, floating-point quarter turn control actuator with linkage

release button. Actuator has a constant drive rate independent of load, a rated torque of 35 in-lb,

a 90-second drive time, and is non-spring return. Travel is terminated by end stops at fully-opened

and -closed positions. An integral magnetic clutch eliminates motor stall.

DDC Actuator - Belimo — LMB24-3-T TN 3-wire, 24 VAC/DC, floating-point, quarter turn actuator

with linkage release button. Actuator has constant drive rate independent of load, rated torque 45

in-lb, 95 sec drive time, and non-spring return. Travel terminated by end stops at fully-opened and

-closed positions. Internal electronic control prevents motor stall when motor reaches end stops.

Direct Digital Controller—Microprocessor based terminal unit controller provides accurate,

pressure-independent control through the use of a proportional integral control algorithm and

direct digital control technology. The controller, named Unit Control Module (UCM), monitors zone

temperature setpoints, zone temperature and its rate of change, and valve airflow using a

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

either supply duct air temperature or CO2 concentration via appropriate sensors. Controller

enclosure has 7/8"(22 mm) knockouts for remote control wiring. Trane DDC 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)—Digital display zone sensor

contains a sensing element, which signals the UCM. A Liquid Crystal Display (LCD) displays

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

temperature readings to be turned on or off. Digital display zone sensor also includes a

communication jack for use with a portable edit device, and an override button to change UCM from

unoccupied to occupied. Override button cancel feature returns 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.

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