WDD/WSD - Grille. Halton WDD/WSD. Universal Grille

Transcription

1 Halton WDD/WSD Universal Grille Horizontal air supply, suitable also for exhaust Adjustable vertical front vanes, adjustable horizontal rear vanes: WDD, adjustable horizontal vanes: WSD Aluminium construction with elegant outlook Detachable grille enables cleaning of the grille and ductwork Accessories Airflow adjustment damper Installation frame Balancing plenum with measurement and adjustment functions Plenum insulation MATERIAL AND FINISHING PART MATERIAL FINISHING Frame Aluminium Epoxy-painted, (std RAL % gloss, Mill finished Vanes Aluminium Epoxy-painted, (std RAL % gloss, Mill finished NOTE Special colours available Special colours available Installation frame Galvanised steel Plenum box / spigot Galvanised steel The bevel angles of the outer frame have been welded so that the joints are almost invisible. 1

2 DIMENSIONS LxH L1 L2 H1 H2 200x x x x x x x x x x x x x x x WDD 25 WSD 25 L2 L1 5 H1 48 H2 WDD: With OD (airflow adjustment damper) total depth = 48 mm + 45 mm. WSD: With OD (airflow adjustment damper) total depth = 32 mm + 45 mm. L Special dimensions In addition to these standard sizes, other dimensions H1 H2 are available by special order. The maximum size is 1500mm x 600mm 25 L1 ACCESSORIES ACCESSORY CODE DESCRIPTION Balancing plenum PRI For balancing & equalising the airflow and attenuating the duct noise Plenum BDR Plenum for duct connection (with or without attenuation material) Airflow measurement and adjustment unit MSM For supply installation Airflow measurement and adjustment unit MEM For exhaust installation Sound attenuation IN Mineral wool for the BDR plenum box. Polyester fiber for the PRI plenum box. Flow adjustment damper OD Aluminium opposite blade damper for airflow adjustment Installation frame IF For installation without plenum Visible screw fastening SF Screw fastening Concealed screw fastening CC For installation with BDR plenum or IF frame Wax-bulb actuator (WDD) MT The actuator controls the vane angle depending on the supply air temperature Wax-bulb actuator (WDD) In applications, where both heating and cooling are provided, the air pattern can be changed automatically via the wax-bulb actuator. The wax-bulb actuator alters the angles of the horizontal rear vane depending on the supply air temperature. Neither auxiliary energy nor dedicated control system are needed. When cold air is supplied at a temperature up to 18 C the supply jet is horizontal. The vane angle is 0. As the supply air temperature rises, the actuator piston progressively changes the angle of the rear vanes to direct the supply air jet downwards. Vane angle reaches 45 in 10 to 20 minutes. No maintenance is required for the wax-bulb actuator. 2

3 WDD WSD Function Supply air is supplied with horizontal and vertical deflection through the vanes into the space: WDD. Supply air is supplied with possible deflection through the horizontal vanes into the space: WSD. The supply air mixes with the room air in front of the grille. The supply air is directed with the horizontal adjustable vanes. Moving the vertical vanes can change the length and form of the flow pattern (WDD). In wall installations, the recommended distance from the ceiling is 200 mm, when the supply air is directed to the ceiling. The rear vane angle can also be controlled by optional wax-bulb actuator (WDD). The grille can also be used as an exhaust unit. Pressure drop, throw pattern and sound data WDD or WSD, wall installation at a distance of 200mm from the ceiling (with Coanda effect) 200x100, 300x100, 300x150, 400x150, 400x200, 600x x200, 600x300, 1000x200, 800x300, 1000x300, 1000x400, 1200x400 Selection example : Note : Requirements : qv = 20 l/s Selection : WDD-400x150 LpA < 35 db(a) LpA = 31 db(a) L0,2 < 25 m L0,2 = 24 m DPtot = 14 Pa When there is no coanda effect (installation greater than 200 mm from ceiling) the throw pattern must be multiplied by

4 Sound power level with od damper Use of an OD opposite blade damper, will result in increased pressure loss. The resulting increase in sound level is computed from the selection chart value and the formula below: LpA = DLp + LpA Kp= Adjusted pressure drop Pressure drop in selection chart Example : WDD-400x150 + OD qv = 200 l/s LpA = 31 db(a) without damper OD/GDD DPs= 50 Pa (desired pressure drop) Kp = 50/14 = 3.6 LpA = = 43 db(a) Throw length correction factor When the throw length is adjusted with the rear vanes, the actual throw length is obtained by multiplying the value obtained from the selection chart by the correction coefficient K1. L0.2 (a) = K1 x L0.2 The correction coefficient K1 is the average for the various grille sizes. Pressure drop correction factor Angle between vanes When the throw length is adjusted with the rear vanes, the actual pressure drop is obtained by multiplying the value obtained from the selection chart by the correction coefficient K2. DPs (a) = K2 x DPs The sound level increases when pressure drop is increased. The correction coefficient K2 is the average for the various grille sizes. Angle between vanes 4

5 SOUND LEVEL DATA, SUPPLY WDD/WSD qv DPst DPtot F (Hz) LpA NR NC (l/s) (m 3 /h) (Pa) (Pa) [db(a)] 200x x x x x x x x x x x x x LpA values presented with room attenuation 4 db (red 10m 2 - sab). When using room attenuation 8 db (red 25m 2 - sab): LpA - 4dB. NR/NC noise criteria 5

6 Installation frame (IF) PRI balancing plenum BDR plenum box Installation The grille is connected to the circular duct using either a PRI balancing plenum or a BDR plenum or alternatively directly to the rectangular duct using the IF installation frame. Visible screw fastening Clips fastening (standard) For ceiling installation, we recommend using visible screw fastening. The auto screws, 4.2x25 (bevel headed screws) are supplied. The grilles are delivered with clips fastening as standard. Clips fastening is used with PRI, BDR and IF. Concealed screw fastening (option) Concealed screw fastening is possible when the grille is installed with an IF installation frame or with a BDR plenum, not with a PRI balancing plenum. Holes are provided for screws in BDR. For ceiling installation, concealed screw fastening is recommended. The dimensions of the installation holes are LxH when an installation frame is used, and (L-5)x(H-5) without installation frame. 30 to 40 6

7 Adjustment Supply In order to enable airflow adjustment and measurement of airflow rate we recommend connecting the diffuser to a BDR plenum or PRI balancing plenum equipped with the MSM module. The supply flow rate is determined by using the measurement and adjustment module MSM. Detach the grille and pass the tubes and control spindle through the grille. Measure the differential pressure with a manometer. The flow rate is calculated using the formula below. q v = k * p m Exhaust The airflow rate is selected by measuring the pressure difference between the measurement tap on the PRI balancing plenum or BDR plenum and the room air. The corresponding airflow rate is calculated and can be adjusted by turning the control spindle of the adjustment unit MEM. Airflow adjustment damper OD The airflow rate is adjusted by turning the damper blades behind the grille using a screwdriver. The measurement is carried out when grille is installed. Adjust the airflow rate by rotating the control spindle until the desired setting is achieved. Lock the damper position with a screw. Replace the tubes and spindle into the plenum and replace the grille. K-factor for installations with different safety distances (D= duct diameter). PRI Supply >8xD min 3xD Exhaust~>8xD x x x x x , x x BDR >6xD min 3xD

8 Servicing Remove the grille by gently drawing it out by the frame. Use a screwdriver if necessary. Clean the parts by wiping them with a damp cloth. Push the grille back into place until the springs lock (or fix by screwing on the concealed screws). Suggested Specifications The grille shall be made of extruded aluminium, with an anodised or epoxy-painted with a white (RAL9010) standard colour. The bevel angles of the outer frame shall be welded so that the joints are almost invisible. Option: with balancing plenum PRI + MSM (MEM) or BDR + MSM (MEM) Remove the measurement and adjustment module by gently pulling the shaft (NB not the control spindle). Wipe the parts with a damp cloth, instead of immersing in water. Remount the measurement and adjustment module by pushing in the shaft until the module meets the stopper. Push the grille back into place so that the clips lock. WDD: The WDD grille shall have horizontal and vertical adjustable vanes. The rear vanes shall direct the supply air jet horizontally. The length and form of the air pattern shall be adjusted by turning the front vanes. WSD: The WSD grille shall have horizontal adjustable vanes and a 25 mm wide radius frame (which shall incorporate a sealing gasket). Optionally The supply air jet shall be controlled according to supply air temperature by a wax-bulb actuator. Alternative 1 The grille shall be connected to the ductwork using a plenum, with mineral wool as sound insulation material. Alternative 2 The grille shall be connected to the ductwork using a balancing plenum, which comprises sound attenuation material made of polyester fibre with a washable surface. The plenum shall comprise an airflow measurement and adjustment unit. The grille shall be removable in order to provide access to the measurement and adjustment module in the plenum. 8

9 Product Code WDD-L-H WSD-L-H L = Length 200,+1,..,1500 H = Height 100,+1,..,600 Specifics and accessories FS = Fastening CL Clips SF Screw fastening CC Concealed screw fastening FI = Finishing AN PN MF Anodised Painted Mill finished CO = Colour W X N White Special colour No painting AC = Accessories WM Wax-bulb actuator Code example WDD , FS=CL,FI=AN,CO=N Sub products BDR Plenum PRI Plenum IF Installation frame (Grilles) OD Opposed blade damper (Grilles) 9