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VAV-PRC011M-EN 77

Dual-Duct VAV Terminal Units

Air Valve Round — The primary air inlet connection is an 18-gage galvanized steel cylinder sized

to fit standard round duct. A multiple-point, averaging flow sensing ring is provided with balancing

taps for measuring +/-5% of unit cataloged airflow.

An airflow-versus-pressure differential calibration chart is provided. The damper blade is

constructed of a closed-cell foam seal that is mechanically locked between two 22-gage galvanized

steel disks. The damper blade assembly is connected to a cast zinc shaft supported by self-

lubricating bearings. The shaft is cast with a damper position indicator. The valve assembly

includes a mechanical stop to prevent over-stroking. At 4.0 in. wg, air valve leakage does not exceed

1% of cataloged airflow.

Outlet Connection

Slip & Drive Connection—Terminal units come standard with slip & drive connection.

Outlet Plenum/Attenuator—A sheet metal, insulated plenum/attenuator with circular opening(s)

is attached to the discharge of the main unit at the factory. The circular opening(s) are centered on

the unit plenum to accept round ductwork connections.

Outlet Plenum/Attenuator with Balancing Dampers—A sheet metal, insulated plenum/attenuator

with circular opening(s) is factory-connected to the main unit. The circular opening(s) with

balancing damper(s) are centered on the unit plenum to accept round ductwork connections.

Unit Controls Sequence of Operation

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.

Direct Digital 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 a constant drive rate independent of load, a rated torque

of 45 in-lb, a 95 second drive time, and is non-spring return. Travel is terminated by end stops at

fully-opened and -closed positions. Internal electronic control prevents motor stall when motor

reaches end stops.

Direct Digital Controller—The 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 the Unit Control Module (UCM), monitors

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

10 (254) 1400 (661) 08 (203) 900 (425)

10 (254) 1400 (661) 10 (254) 1400 (661)

12 (305) 1400 (944) 08 (203) 900 (425)

12 (305) 2000 (944) 10 (254) 1400 (661)

12 (305) 2000 (944) 12 (305) 2000 (944)

14 (356) 3000 (1416) 14 (356) 3000 (1416)

16 (406) 4000 (1888) 16 (406) 4000 (1888)

Table 47. Air valve combinations available (continued)

Air Valve Size in. (mm)

Cooling

Cataloged Airflow cfm

(L/s)

Cooling

Air Valve Size in. (mm)

Heating

Catalog Airflow cfm

(L/s)

Heating

05 (127) 350 (165) 05 (127) 350 (165)

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 157 158

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