Technical information

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4 Application Rectangular NK and NL types are pressure-independent VAV and CAV air volume control terminals. The terminals are designed particularly for systems with large air volumes and duct sizes and for the accurate measurement and control of air volumes using the patented airflow sensor type Flo- Cross airflow sensor. In CAV application, the terminals maintain the required constant airflow independent of the inlet static pressure. In VAV application, the terminals control the air volume to the room, to match the cooling load required thus saving energy consumption in both cooling and heating applications. The VAV or CAV terminals can be used either for supply or return air applications in new or refurbishment projects. The terminals have single wall (type NK) or double wall (type NL) construction and can be optionally supplied with an additional sound attenuator or a hot water or electric reheater. Features: Pressure independent control functions. Compact design. Volume control range 100% to 10%. Low pressure loss over the terminal. Single or double wall construction. Factory fitted additional attenuator and/or built-in hot water or electric reheater. Multi-leaf damper blade with full shut-off option. Low noise production. Suitable for large air volumes. Suitable for all control functions VAV, CAV, shut-off to maximise system energy savings. Flo-Cross, 2 x 12 points averaging and signal amplifying airflow sensor, better than 2.5% accuracy even with irregular duct approach. Maintenance free. Technical information Casing: Single or double wall, air-tight construction made of galvanized sheet steel with low casing leakage rate. Insulation: In case of double wall construction 25mm insulation material is completely enclosed by the double wall construction. Damper: Damper blade: aluminium, aerofoil 50mm wide opposed blade construction with external linkage. Blades can be optionally provided with neoprene gasket for full shutoff function. Flo-Cross: Extruded aluminium construction with nylon core and feet. Sound attenuator: Constructed from galvanized sheet steel, internal acoustic insulation, erosion proof up to 30m/s. Reheaters: Choice of electric reheat coil VAC/1-phase or VAC/3-phase or hot water reheat coil. Controls: Suitable for use with pneumatic, analogue, electronic or DDC controllers. Controls can be factory fitted, wired and calibrated. A controls enclosure made from galvanised sheet steel can be provided as an option. Delivery format: Delivery format: The VAV or CAV terminal will be supplied as a single assembly. Optional ordered distribution plenum, reheat coil and/or controls are factory fitted, wired and calibrated. The on site delivered terminal is ready to be installed and commissioned. Controls location and hot water or electric connections are fitted on the right hand side of the terminal when looking in the direction of the airflow. On request, the terminal can be delivered with connections on the left hand side. When terminals are ordered with controls, these will be factory fitted, wired and calibrated upon request.

5 Specify as: Example: Supply and install rectangular variable air volume terminals with double-wall construction, constructed from galvanized sheet steel. The casing leakage rate shall be classified according to class II, VDI3803/DIN24194 and the duct connections shall be 30 mm flange type. The VAV terminals shall have a multi-leaf opposed blade dampers. A Flo-Cross centre averaging airflow sensor with at least 2 x 12 test points and amplified signal shall control the airflow with an accuracy of not less than 2.5%. The controller shall be I/A Series DDC controller: LON compatible, type MNL-V2RVx. Controls must be factory fitted, wired and calibrated according to the following requirements: Maximum air volume 1280 l/s Minimum air volume 512 l/s Terminal size 400 x 400 mm Max. pressure loss 38 Pa Max. discharge sound index < Δp Max. radiated sound index < Δp Ordering example: type - model - handing= NLODOOB Manufacturer: Barcol-Air Installation Instructions: The Barcol-Air VAV terminals shall be installed using at least two support brackets, with antivibration rubber under the terminal as shown in the drawing below. Each of these brackets shall be fixed with two threaded rods to the ceiling slab above. The installation method shall: 1.Prevent the body of the VAV terminal from high mechanical tension, which could damage the construction and performance of the terminal. 2.Prevent torsion on the VAV terminals, which could cause malfunction of the damper blades. 3.Provide some flexibility to the final location of the VAV terminals. 4.Use at least one diameter straight duct length before the VAV inlet. 5.Additional manual volume control dampers(vcd's)shall not be used before the unit inlet should not be used. 6.All connections shall be thermally isolated. 7.The Flo-Cross airflow sensor pressure sensing tubes shall not be "kinked" or otherwise obstructed by the external duct insulation. See drawing below. optional:4 x duct fixing hook contact Barcol-Air for futher details

6 Notes 1.All dimensions in mm. 2.All flanges are 30mm wide. 3.Other dimensions are available on request.

7 Notes 1.All dimensions in mm. 2.All flanges are 30mm wide. 3.Other dimensions are available on request.

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