General Information
Application
- Circular EXCONTROL VAV terminal units of Type TVR-Ex for the precise supply air or extract air flow control in variable air volume systems
- For use in potentially explosive atmospheres (ATEX)
- Closed-loop volume flow control using an external power supply
- Electronic or pneumatic volume flow control
- Shut-off by means of switching (equipment supplied by others)
Special features
- ATEX mark and certification
- ATEX equipment group II, approved for use in zones 1 and 2; electronic control also for zones 21 and 22
- The volume flow rate can later be measured and adjusted on site; configuration is possible using personal computer software
Nominal sizes
5, 6, 8, 10, 12, 16
Classification
- Electronic control: Equipment group II
Attachments
- Electronic control
- Pneumatic control
Variants
- Actuator with auxiliary switch for capturing the end positions
- Spring return actuator
Technical data
- Nominal sizes: 5 to 16 in
- Volume flow rate range: 32 to 2560 cfm
- Volume flow rate control range: approx. 15 – 100 % of thenominal volume flow rate
- Maximum differential pressure: 4.02 in wg
- Operating temperature: 50 to 122 °F
Useful additions
- Circular silencer CA or CAH (for Germany and Switzerland) or CAH (for EMEA) for demanding acoustic requirements
Construction features
- Construction and materials comply with the EU directive and guidelines for use in potentially explosive atmospheres (ATEX)
- Zones 1 and 2 (atmosphere: gases):II 2 G c II T5: 50 °F – 122°F and T6: 50 °F – 140 °F
- Zones 21 and 22 (atmosphere: dusts):II 2 D c II 176 °F Pneumatic control: Equipment group II
- Spigot with lip seal, for circular connecting ducts to EN 1506 or EN 13180
Materials and surfaces
- Casing and inner duct made of galvanised sheet steel
- Zones 1 and 2 (atmosphere: gases):II 2 G c II T5: 50 °F – 122°F and T6: 50 °F – 140 °F
Construction
- Galvanised sheet steel
- P1: Inner duct powder-coated RAL 7001, silver grey
- A2: Inner duct in stainless steel
Parts and characteristics
- Ready-to-commission unit which consists of mechanical parts and control components
- Averaging differential pressure sensor for volume flow rate measurement
- Damper blade
- Connection for equipotential bonding
- Cable glands suitable for use in potentially explosive atmospheres
- ATEX-compliant control components, factory mounted and complete with wiring and tubing
- Aerodynamic functional testing on a special test rig before shipping of each unit
- Set-up data is given on a label affixed to the unit
- High control accuracy (even with upstream bend R = 1D)
- Control components made of die cast aluminium (pneumatic control: plastic)
- Plastic bearings
- Damper blade of stainless steel with thermoplastic elastomer seal TPE
- Differential pressure sensor made of aluminium
- P1: Inner duct powder-coated
- A2: Inner duct in stainless steel
Standards and guidelines
- Directive 2014/34/EU: Equipment and protective systems intended for use in potentially explosive atmospheres
Maintenance
- Maintenance-free as construction and materials are not subject to wear
- Zero point correction of the static differential pressure transducer should be carried out once per year (recommendation, with electronic control)
Commissioning
- The controller parameters are factory set
- Adjustments may be required as part of commissioning (by others)
