VAV/CAV BOXES COMMERCIAL BUILDINGS INNOVATIVE VENTILATION & HEATING

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1 VAV/CAV BOXES COMMERCIAL BUILDINGS A guide to VAV/CAV, including our unique product range, consultancy service and accessories. INNOVATIVE VENTILATION & HEATING

2 At Price TWA we believe in providing a quality service with quality products, our approach is professional and knowledgeable and we hope to show this in everything we do we constantly strive to be the best. Variable Air Volume (VAV) boxes are a dynamic ventilation product that can enable a comfortable indoor environment to be achieved. Our units control the required volume of airflow into a space and can operate across a wide range of volume flow rates. OUR SERVICE Our experienced engineers offer product selection based on building type, occupancy and duct size. We work closely with consultants and contractors to provide the most efficient ventilation solution. Our units are built to last using durable galvanised steel casing and designed to fit a range of duct sizes. To ensure effective operation we offer advice on installation, configuration and best practice support. DELIVERING THE RIGHT AMOUNT OF TO THE RIGHT PLACE AT THE RIGHT TIME

3 DELIVERING INDUSTRY EXPERTISE Price TWA was formed in 2008 from the merger of two leading heating and ventilation suppliers in the UK, Price Technical Ltd (Formed in 1997 to supply high quality ventilation and heating systems) and TWA Panels UK Ltd (formed in 2003 to supply radiant heating panels). Together we now offer one of the widest ranges of heating and ventilation solutions in the UK. We are recognised in the industry not only for excellent design and manufacture of heating and ventilation systems but also for maintaining strong relationships with both specifiers and contractors. This combined with our strong manufacturing background has set us among the very best of the UK s heating and ventilation solutions providers. OUR EXPERIENCE We have grown and adapted as the construction industry has, offering modern solutions to modern issues. We understand that every project has individual needs and always offer flexible informed solutions to meet the needs of every project. Years of experience and industry expertise will provide you with a solution that s cost effective, efficient and suited to your building s individual design and function. Within this brochure we cover our wide range of variable and constant air volume units. If you require alternative ventilation solutions please refer to our Product Solutions brochure. We operate from our manufacturing base in Bristol where we create and distribute our products. We have a dedicated team of sales engineers and representatives throughout the UK and Ireland offering exceptional customer service. VAV/CAV PRODUCT RANGE CIRCULAR RECTANGULAR TRANSFORMATION CIRCULAR P6 RS/RD P8 RAS/RAE RECTANGULAR P10 KS-1/KD-1 P12 KS-/KD- P6 MECHANICAL P10 ADDITIONAL INFORMATION P16 CONTROLS TRANSFORMATION P16 VSV/VDV MECHANICAL (CAV) P18 VCMH P19 VCMR ADDITIONAL INFO P22 ACOUSTICS P18 P22 P23 CONTROLS P23 ACTUATORS COMMITTED TO BECOME THE INDUSTRY S LEADING SUPPLIER OF VENTILATION AND HEATING IN THE UK +44 (0) VAV/CAV 3

4 OUR VAV/CAV BOXES TYPICAL VAV CONFIGURATION VELOCITY FLOW GRID DAMPER OPEN POSITION RUBBER SEAL (ON EDGE OF DAMPER) FRESH INTAKE FRESH SUPPLY Damper leakage exceeds EN 1751 Class 3 Casing leakage exceeds EN 1751 Class C OVAL DAMPER (IN CLOSED POSITION) ACTUATOR CONTROLLER (WITH NFC) Our Variable Air Volume (VAV) units enable the required amount of air to be delivered to a space for ventilation or cooling purposes. A control signal allows the actuator to adjust the damper position to increase, decrease, or shut off airflow. The amount of air flow is determined by the velocity flow grid which continuously measures air velocity in the system ductwork. This means that our VAV units can respond to environmental changes such as increased occupancy or cooling demand and adjust air flow according to signals from a local or central control system providing good air quality whilst avoiding excessive ventilation. CONSTANT SUPPLY Our VAV units can also act as a Constant Air Volume (CAV) unit providing a set amount of airflow independent of changes elsewhere in the system. Alternatively, we also offer mechanical CAV units that operate without a power supply. EFFICIENCY The velocity flow grid/diff-cross TM is used in all our VAV units to measure air velocity in the ductwork. The Diff-Cross TM very accurately calculates the air velocity by recording positive and negative pressure differences. This information allows the controller actuator to react to any changes and reposition the damper accordingly. THE DAMPER Each unit has a built-in damper with rubber seals that have the ability to shut off air flow to EN 1751 Class 3 on our circular dampers and EN 1751 Class 2 on our rectangular dampers. The angle of the damper is adjusted to restrict or supply the amount of airflow which is controlled by the actuator on VAV units or mechanically on a mechanical CAV unit. DELIVERING PRECISE FLOW CONTROL SOUND PERFORMANCE All our units have a double wall option which includes fire resistant acoustic lining. ASL & ASK attenuators are available for all our rectangular units to reduce sound output, some units have integral attenuators. OUR VAV/CAV UNITS OFFER PRECISE FLOW CONTROL REGULATIONS & GUIDELINES All our products can ensure relevant regulations are complied with, such as Building Regulations Part F & Part L. They can also offer significant energy savings (0) VAV/CAV

5 THE CONTROL SYSTEM CONTROLLER ACTUATORS We use VAV controller actuators to operate our dampers and along with our Diff-Cross TM forms an integral part of the unit operation. These units require a signal from a local or central control system provided by others to operate to the air volume required by that control system. A correctly installed system using our design guidance would need no further adjustment on site, however where a suitable straight approach is not possible an adjustment tool can be used, either the handheld ZTH-EU adjuster or the Belimo Assistant App on a suitable device using Near Field Communication (NFC) built into the controller actuator. STANDARD CONTROLS LMV-D3-MP NMV-D3-MP (for larger units) Other controls available LonMark Modbus KNX BACnet COMPATIBLE CONTROL OPTIONS FAST ACTING ACTUATOR For a quick response to changes in air conditions the fast acting actuator will provide fast shutoff and damper re-positioning, typically used in fume cupboard applications. SPINDLE POSITION INDICATOR SPINDLE CLAMP LED DISPLAY (POWER/COMMUNICATIONS) NFC SENSOR TOOL SOCKET (ZTH EU & PC-Tool) ELECTRICAL & POWER CONNECTION GEAR DISENGAGEMENT VELOCITY FLOW GRID CONNECTIONS (+VE & -VE) BELIMO LMV-D3-MP CONTROLLER ASSISTANT APP ADJUSTMENT TOOL ADJUSTMENT TOOLS Both the ZTH EU and Belimo Assistant App allow the following adjustments: SET POINT ACTUAL FLOW ACTUAL DAMPER POSITION VMAX, VMID, VMIN (Further adjustments and information is available with the use of the PC-Tool) ZTH EU ADJUSTMENT TOOL +44 (0) VAV/CAV 5

6 CIRCULAR VAV RS/RD VARIABLE VOLUME UNITS SINGLE WALL RS UNIT Our compact VAV units are laser welded with continuous galvanised casing and contain a low noise air tight oval air damper with Diff-cross TM airflow averaging grid. The unit comes with a controller actuator and is available single, double walled or attenuated. RS UNIT ILLUSTRATION 600 Casing tight shut off to EN 1751 Class C END VIEW DIFF-CROSS TM RD UNIT ILLUSTRATION Casing tight shut off to EN 1751 Class C END VIEW GALVANISED CASING INSULATED WALL (FIRE RESISTANT) 600 CONTROLS 600 Ø12 mm SPINDLE CONTROL MOUNT Ø12 mm SPINDLE D SWAGED ENDS TO ACCEPT RUBBER SEALS (BY OTHERS) Spigots to EN 16 or 13180, swaged to EN16:2006 & 2007 ELLIPTICAL DAMPER (Closed at 45 ) Damper blade rubber seal leakage exceeds EN 1751 Class 3 Spigots to EN 16 or 13180, swaged to EN16:2006 & 2007 SWAGED ENDS TO ACCEPT RUBBER SEALS (BY OTHERS) ELLIPTICAL DAMPER (Closed at 45 ) A CIRCULAR SOLUTION Our circular units are designed to match regular duct sizes up to 400 mm allowing for easy duct connection. With accurate airflow control at lower velocities with lower resistance. To deliver larger air volumes more units or rectangular units are recommended. OUR UNITS OFFER BOTH VARIABLE (VAV) & CONSTANT FLOW (CAV) CONTROL DOUBLE WALL RD UNIT DIFF-CROSS TM 65 CONTROL MOUNT Acoustic lining fire resistant to BS476; Part 7 CONTROLS Damper blade rubber seal leakage exceeds EN 1751 Class 3 DESIGN FEATURES Our circular RS & RD VAV units are available in eight sizes offering accurate airflow control and tight shut off. The unit is designed to stop leakage using unique elliptical damper blades with rubber seals and nylon bearings. A smooth continuous casing with minimal airflow resistance allows the units to achieve low noise levels. (mm) RS RD ACCURATE CONTROL The Diff-Cross TM airflow averaging grid measures airflow velocity through ductwork. The controls re-position the oval damper blade in response to airflow demand, providing an accurate and efficient airflow solution. The units can also provide a Constant Air Volume (CAV) Solution. 10 OPTIONAL EXTRAS Type 316 or 304 Stainless Steel Epoxy coating Polyester powder coating OUR CIRCULAR UNITS OFFER ACCURATE FLOW CONTROL AT LOWER VELOCITIES (0) VAV/CAV

7 mm 125 mm 160 mm VELOCITY SIZE VOLUME MIN Δ Ps DISCHARGE RS/RD SINGLE WALL (RS) RADIATED DOUBLE WALL (RD) Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa RS/RD SOUND PERFORMANCE Pa 200 Pa 400 Pa 200 mm Pa 200 Pa 400 Pa 2 mm Pa 200 Pa 400 Pa 315 mm Pa 200 Pa 400 Pa 355 mm Pa 200 Pa 400 Pa 400 mm Pa 200 Pa 400 Pa System Static Pressure +44 (0) VAV/CAV 7

8 65 CIRCULAR VAV RAS/RAE VARIABLE VOLUME UNITS Our compact VAV units comprise of galvanised casing with continuous laser welded seal and contain an integral attenuator, low noise air tight oval air damper and Diff-cross TM airflow averaging grid. The unit comes complete with controller actuator. RAS SUPPLY UNIT ILLUSTRATION 10 Casing tight shut off to EN 1751 Class C DIFF-CROSS TM 65 RAE EXTRACT UNIT ILLUSTRATION Casing tight shut off to EN 1751 Class C 65 Acoustic lining fire resistant to BS476; Part 7 65 Acoustic lining fire resistant to BS476; Part 7 INSULATED WALL (FIRE RESISTANT) CONTROLS INSULATED WALL (FIRE RESISTANT) CONTROLS Ø12 mm SPINDLE CONTROL MOUNT Ø12 mm SPINDLE CONTROL MOUNT 10 ELLIPTICAL DAMPER (Closed at 45 ) 10 ELLIPTICAL DAMPER (Closed at 45 ) 10 PERFORATED WALL PERFORATED WALL DIFF-CROSS TM Spigots to EN 16 or 13180, swaged to EN16:2006 & 2007 D D D D SWAGED ENDS TO ACCEPT RUBBER SEALS (BY OTHERS) Damper blade rubber seal leakage exceeds EN 1751 Class 3 Spigots to EN 16 or 13180, swaged to EN16:2006 & 2007 SWAGED ENDS TO ACCEPT RUBBER SEALS (BY OTHERS) Damper blade rubber seal leakage exceeds EN 1751 Class 3 DESIGN FEATURES 65 Our circular RAS & RAE VAV units are available in many sizes offering accurate airflow control and tight shut off. The unit is designed to stop leakage using unique elliptical damper blades with rubber seals and nylon bearings. Smooth continuous casing with minimal airflow resistance allows the units to achieve low noise levels. ACCURATE CONTROL The Diff-Cross TM airflow averaging grid measures airflow velocity through ductwork. The controls re-position the oval damper blade in response to airflow demand, providing an accurate and efficient airflow solution. The units can also provide a Constant Air Volume (CAV) Solution. A CIRCULAR SOLUTION Our circular units are designed to match regular duct sizes up to 400 mm allowing for easy duct connection. With accurate airflow control at lower velocities with lower resistance. To deliver larger air volumes our rectangular units are recommended. (mm) RAS RAE POD OPTIONAL EXTRAS Attenuator POD (see additional information p22) Polyester Powder Coating THE RAS/RAE UNIT OFFERS SIGNIFICANT SOUND ATTENUATION PARTICULARLY AT SMALLER SIZES (0) VAV/CAV

9 mm 125 mm 160 mm VELOCITY VOLUME MIN Δ Ps DISCHARGE RADIATED RAS/RAE SOUND PERFORMANCE mm THE RA INTEGRATED SOUND ATTENUATOR REDUCES DISCHARGE SOUND LEVELS mm mm mm mm Pa 200 Pa 400 Pa System Static Pressure +44 (0) VAV/CAV 9

10 RECTANGULAR VAV KS-1/KD-1 SINGLE-BLADE VARIABLE VOLUME UNITS Our K-1 rectangular VAV units contain a single low noise air tight damper blade and airflow averaging grid within a robust galvanised casing. The unit comes with controller actuator and is available as single or double walled with the option of an attenuator. KS-1 UNIT END VIEW mm casing exceeds leakage EN 1751, 1998 Class B 30 DESIGN FEATURES Our single blade rectangular KS & KD VAV units are available in many sizes offering ΔP max of 0Pa. The units can also provide a Constant Air Volume. M8 CORNER HOLES KD-1 UNIT DIFF-CROSS TM 0 CONTROLS RECTANGULAR DAMPER 30 mm DUCT FLANGE Damper blade rubber seal leakage exceeds EN 1751 Class 2 ACCURATE CONTROL The Diff-Cross TM airflow averaging grid measures airflow velocity through ductwork. The controls re-position the single damper blade in response to airflow demand, providing an accurate and efficient airflow solution. EFFECTIVE SINGLE- BLADE SOLUTION Acoustic lining fire resistant to BS476; Part 7 END VIEW M8 CORNER HOLES Attenuator ASK ATTENUATOR UNIT DIFF-CROSS TM INSULATED WALL (FIRE RESISTANT) 0 CONTROLS mm casing exceeds leakage EN 1751, 1998 Class B 30 RECTANGULAR DAMPER 30 mm DUCT FLANGE 35 Damper blade rubber seal leakage exceeds EN 1751 Class 2 UNIT SINGLE BLADE UNIT (mm) WIDTH HEIGHT Min 200 Min mm increments Max 600 Max 300 OPTIONAL EXTRAS Polyester Powder Coating SINGLE BLADE SOLUTION The rubber sealed single blade design allows the units to achieve low noise levels and offers effective tight shut off. To deliver larger air volumes our KS-/KD- rectangular units are recommended. END VIEW Attenuator Attenuator UNIT 35 UNIT NOTE: ATTENUATOR IS mm HIGHER THAN VAV UNIT Connecting plate included ATTENUATOR COMPATIBLE SIZES (mm) KS x 400 x 600 x 200 x x x x x x 300 ASK 200 x x x x x x x x x (0) VAV/CAV

11 KS-1/KD-1 SOUND PERFORMANCE SIZE DISCHARGE RADIATED VELOCITY VOLUME MIN Δ Ps WITHOUT ATTENUATOR WITH ATTENUATOR (ASK see size chart) SINGLE WALL (KS-1) DOUBLE WALL (KD-1) (+ ASK) 200 x (+5) (+10) (+20) (+37) x x 200 x x 400 x x x x (+5) (+10) (+20) (+37) (+5) (+10) (+20) (+37) (+8) (+18) (+36) (+65) (+8) (18) (36) (65) (+8) (18) (36) (65) (+7) (+17) (+43) (+62) (+7) (+17) (+34) (+62) (+7) (+17) 6 1, (+34) 8 1, (+62) (0) VAV/CAV Pa 200 Pa 400 Pa System Static Pressure 11 Continued overleaf

12 RECTANGULAR VAV KS-/KD- MULTI-BLADE VARIABLE VOLUME UNITS Our rectangular VAV units contain multiple air tight damper blades and airflow averaging grid within a robust galvanised casing. The unit comes with controls and is available as single or double walled with the attenuator options. KS- UNIT END VIEW mm DUCT FLANGE mm casing exceeds leakage EN 1751, 1998 Class B DESIGN FEATURES Our multi-blade rectangular KS & KD VAV units are available in many sizes mm blade increments. The units can also provide Constant Air Volume. M8 HOLES KD- UNIT 30 0 DIFF-CROSS TM 25 CONTROLS mm DAMPER Damper blade rubber seal leakage exceeds EN 1751 Class 2 ACCURATE CONTROL The Diff-Cross TM airflow averaging grid measures airflow velocity through ductwork. The controls re-position the damper blades in response to airflow demand, providing an accurate and efficient airflow solution. HIGH VOLUME CAPACITY Acoustic lining fire resistant to BS476; Part 7 M8 HOLES END VIEW INSULATED WALL (FIRE RESISTANT) 0 DIFF-CROSS TM mm casing exceeds leakage EN 1751, 1998 Class B CONTROLS 25 mm DAMPER Damper blade rubber seal leakage exceeds EN 1751 Class 2 MULTI-BLADE UNIT (mm) WIDTH HEIGHT Min 200 Min 110 mm increments Max 0 Max 1010 OPTIONAL EXTRAS Polyester Powder Coating MULTI-BLADE SOLUTION The mm blades are c/w rubber seals to ensure tight shut off and with multiple blades they offer a large scale VAV solution. ASL/ASK ATTENUATOR UNIT 1 END VIEW ASL 2 END VIEW ASK (sizes match VAV unit) UNIT (for 600mm high and above) (for 0mm high and below) UNIT ATTENUATOR COMPATIBLE SIZES (mm) KS- 900 x x x x x x x x x x x 1010 ASL 0 x x x x x x x x x x x (0) VAV/CAV

13 KS-/KD- SOUND PERFORMANCE SIZE DISCHARGE RADIATED VELOCITY VOLUME MIN Δ Ps WITHOUT ATTENUATOR WITH ATTENUATOR (ASK/ASL see chart) SINGLE WALL (KS-) DOUBLE WALL (KD-) (+ASK/ASL) 900 x (+10) (+39) 6 1, , X X X X X X x x x x x x x x (+7) (+28) 6 1, , (+7) 4 1,116 6 (+28) 6 1, , (+7) 4 1,488 6 (+28) 6 2, , (+7) (+28) 6 1, , (+7) 4 1,476 6 (+28) 6 2, , (+7) 4 1,968 6 (+28) 6 2, , (+7) 4 1,224 7 (+27) 6 1, , (+7) 4 1,836 6 (+27) 6 2, , X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X (0) VAV/CAV Pa 200 Pa 400 Pa System Static Pressure 13 Continued overleaf

14 KS-/KD- SOUND PERFORMANCE SIZE DISCHARGE RADIATED VELOCITY VOLUME MIN Δ Ps WITHOUT ATTENUATOR WITH ATTENUATOR (ASK or ASL) SINGLE WALL (KS-) DOUBLE WALL (KD-) 1200 x 510 (+ASK/ASL) 2 1,224 2 (+7) 4 2,448 6 (+27) 6 3, , X X X X X X x x x x x x x x (+7) 4 1,464 7 (+28) 6 2, , ,098 2 (+6) 4 2,196 6 (+23) 6 3, , ,464 2 (+7) 4 2,928 6 (+28) 6 4, , (+7) 4 1,704 7 (+28) 6 2, , ,278 2 (+6) 4 2,556 6 (+23) 6 3, , ,704 2 (+7) 4 3,408 6 (+28) 6 5, , ,458 2 (+6) 4 2,916 6 (+23) 6 4, , ,944 2 (+7) 4 3,888 6 (+28) 6 5, , X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Pa 200 Pa 400 Pa System Static Pressure (0) VAV/CAV Continued overleaf

15 KS-/KD- SOUND PERFORMANCE SIZE DISCHARGE RADIATED VELOCITY VOLUME MIN Δ Ps WITHOUT ATTENUATOR WITH ATTENUATOR (ASK or ASL) SINGLE WALL (KS-) DOUBLE WALL (KD-) (+ASK/ASL) 900 x ,638 2 (+6) 4 3,276 6 (+23) 6 4, , X X X X X X x ,184 2 (+7) 4 4,368 6 (28) 6 6, , X X X X X X x ,818 2 (+6) 4 3,636 6 (+23) 6 5, , X X X X X X x ,424 2 (+7) 4 4,848 6 (+28) 6 7, , X X X X X X Pa 200 Pa 400 Pa System Static Pressure ASK ATTENUATORS UP TO 0 mm HIGH ASL ATTENUATORS ABOVE 600 mm HIGH +44 (0) VAV/CAV 15 Continued overleaf

16 TRANSFORMATION VAV VSV/VDV & VSE/VDE CIRCULAR TO RECTANGULAR VARIABLE VOLUME UNIT Our transformation VAV units offer a circular spigot to rectangular connection. They are made with galvanised mild steel casing and contain low noise air tight dampers, an airflow averaging grid and a built-in attenuator. The unit comes with controls and is available as single or double walled. VSV SUPPLY UNIT (VSE EXTRACT NOT SHOWN) Acoustic lining fire resistant to BS476; Part 7 Length 80 ELLIPTICAL DAMPER (Closed at 45 ) Length M8 FIXINGS 80 INTEGRATED SOUND ATTENUATOR Width W1 H1 W2 H1 SPIGOT Ø12 mm SPINDLE DIFF-CROSS TM Width W1 H2 W2 40 Casing leakage better than EN 1751, 1998 class B CONTROLS Button punch snap lock seams, Lockform TM with airtight nylon bearings. H2 40 VDV SUPPLY UNIT (VDE EXTRACT NOT SHOWN) Length Acoustic lining fire resistant to BS476; Part 7 Length (+) ELLIPTICAL DAMPER (Closed at 45 ) FIRE RESISTANT DOUBLE WALL Width Width INTEGRATED SOUND ATTENUATOR M8 FIXINGS W1 W1 H1 H1 H2 W2 W2 Width (+) SPIGOT 40 Ø12 mm SPINDLE DIFF-CROSS TM H2 40 Casing leakage better than EN 1751, 1998 class B CONTROLS Button punch snap lock seams, Lockform TM with airtight nylon bearings. CIRCULAR SPIGOT *UNIT SIZE in mm (WxHxL) RECTANGULAR DUCT CONNECTION (W1xH1) M8 FIXING CONNECTION in mm (W2xH2) 400 x 240 x x x x 240 x x x x 240 x x x x 280 x x x x 310 x x x x 360 x x x x 4 x x x x 4 x x x 388 DESIGN FEATURES Our transformation units are available in multiple sizes. The units can provide both Variable Air Volume (VAV) and Constant Air Volume (CAV). OPTIONAL EXTRAS ASV attenuator Multiple outlet spigot boxes Polyester powder coating *Add 80 mm to length to include spigot. Add mm to height & width for double insulated unit COMPLIES WITH REQUIREMENTS FOR CLEAN ROOMS CLASS 3 TO VDI 2083 & CLASS TO US STANDARD (0) VAV/CAV

17 VELOCITY SIZE VOLUME MIN Δ Ps DISCHARGE WITH ATTENUATOR Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa SINGLE WALL (VSV/VSE) RADIATED DOUBLE WALL (VDV/VDE) Pa 200 Pa 400 Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa 200 Pa 400 Pa VSV/VDV & VSE/VDE SOUND PERFORMANCE Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa 200 Pa 400 Pa Pa 200 Pa 400 Pa System Static Pressure +44 (0) VAV/CAV 17

18 MECHANICAL CAV VCMH CIRCULAR CONSTANT VOLUME UNIT The VCMH is a mechanical constant volume damper. The damper is designed to maintain the design volume independent of inlet pressure. The design volume is easily set by adjustment of the external sliding scale. VCMH UNIT central nut E 45 D 65 DOUBLE WALL OPTION A L 1 L 2 A To adjust the volume setting of the regulator, firstly loosen the central nut E, adjust the dial to the desired flow rate and re-tighten the nut. Air Volume Flow Rate l/s Minimum Static Pressure Velocity Static Inlet Pressure Pa Pa 2 Pa Model l/s Pa m/s Lp Lp Lp AVAILABLE TYPES V C M H O O V volume unit C constant volume M mechanical control H round design, adjustable - adjustability O manual M actuator: LM24A, LM230A, LM24A-SR - connection O standard (no rubber seals) R rubber seal D double walled A rubber seal and double walled THE VCMH OFFERS A CIRCULAR MECHANICAL CAV SOLUTION Model A L 1 L 2 D Correction radiated sound Model O/R Single D/A Double Correction discharge sound k 2k DISCHARGE (0) VAV/CAV

19 MECHANICAL CAV VCMR RECTANGULAR CONSTANT VOLUME UNIT The VCMR is a mechanical constant volume damper. The damper is designed to maintain the design volume independent of inlet pressure. The design volume is easily set by adjustment of the external sliding scale. VCMR UNIT 55 (increase to 140 if c/w actuator) central nut E 35 H 35 B L To adjust the volume setting of the regulator, firstly loosen the central nut E, adjust the dial to the desired flow rate and re-tighten the nut. AVAILABLE TYPES V C M R O O V volume unit C constant volume M mechanical control R rectangular design, adjustable - adjustability O manual M actuator: LM24A, LM230A, LM24A-SR - construction O single wall D double walled Octave band Correction k 2k 4k 8k DISCHARGE RADIATED THE VCMR OFFERS A RECTANGULAR MECHANICAL CAV SOLUTION Model Length l/s Pmin m/s DISCHARGE (Lp) RADIATED (Lp) 200 x x x x (0) VAV/CAV 19

20 MECHANICAL VCMR SOUND PERFORMANCE Model Length l/s Pmin m/s 300 x DISCHARGE (Lp) RADIATED (Lp) x x x x x x x x x , x , x , x , , (0) VAV/CAV

21 At Price TWA we believe in providing a quality service with quality products, our approach is professional and knowledgeable and we hope to show this in everything we do we constantly strive to be the best. +44 (0) VAV/CAV 21

22 ADDITIONAL INFORMATION ACOUSTICS Our sound power levels are calculated using the values set out according to VDI 2081 DISCHARGE SOUND ALLOWANCE Our discharge sound levels are calculated according to VDI 2081 for end reflection. Room and duct sound attenuation as follows. RS/RD/RA/RAE/KS-1/KD-1/VSV/VDV/VSE/VDE Values subtracted from sound power levels Hz K 2K 4K db/oct Additional values subtracted according to air flow l/s db/oct KS-/KD- Values subtracted from sound power levels Hz K 2K 4K db/oct Additional values subtracted according to air flow l/s db/oct INSERTION LOSS FOR ASV SOUND ATTENUATOR (for our transformation units) Model db(a) RADIATED SOUND Radiated sound allowance according to VDI2081 is 5dB/oct for room attenuation and 4dB/oct for ceiling attenuation total 9dB/oct. Double wall radiated figures are based on duct work being acoustically lagged 3 m either side of the unit. INSERTION LOSS DATA FOR RAS/RAE ADDITIONAL PODS AVAILABLE ON REQUEST RS/RD/ RAS/RAE KS-1/KD-1/ KS-/KD- VSV/VDV/ VSE/VDE * Requires no straight approach MINIMUM VELOCITY 1.0 m/s 1.5 m/s 2.0 m/s* CONTROL MODES VAV with shut-off (CLOSE, V mode) ~ AC 24V + DC 24V DUCT STRAIGHT APPROACH 3x Diameter (or equivalent diameter) approach required for effective operation. Due to the unique design VSV/VDV units do not require any straight approach. VAV reference signal V RAS UNIT D Switching CLOSED/VAV mode Tool/Actual valve signal V/ V 3D OTHER CONTROL OPTIONS V mode Close/min/max using 24V signal SUPPLY DIFFUSER ~ Y U +...MV-D3-MP PC-Tool ZTH-GEN Please contact a Price TWA engineer for further information (0) VAV/CAV

23 NOTES +44 (0) VAV/CAV 23

24 Tel: +44 (0) Web: INNOVATIVE VENTILATION & HEATING Natural Ventilation Radiant Panels External Louvres Chilled Beams Heat Recovery VAV/CAV Boxes Displacement Grilles & Diffusers Air Handling Units Fan Coil Units Price TWA is a trading name of Price Technical Limited. Registered Office: Unit 1, Smiths Forge Ind Est, North End Rd,Yatton, Bristol BS49 4AU. Registered in England No Price TWA 0816 Version.2