TROX

Constant Volume Dampers Type ‘RN’

FOR THE PRECISE CONTROL OF CONSTANT VOLUME FLOW RATES

Circular self-powered volume flow controllers for the control of supply air or extract air in constant air volume systems

  • Volume flow rate can be set using an external scale, no tools required
  • High control accuracy
  • No on-site test measurements required for commissioning
  • Suitable for airflow velocities of up to 12 m/s
  • Any installation orientation; maintenance-free
  • Casing air leakage to EN 1751, class C

Optional equipment and accessories

  • Acoustic cladding for the reduction of case-radiated noise
  • Secondary silencer Type CA, CS or CF for the reduction of air-regenerated noise
  • Hot water heat exchanger Type WL and electric air heater Type EL for reheating the airflow
  • Actuator for switching between setpoint values

Product Information

Variants

  • RN-S: Compact-height volume flow controller
  • RN: Volume flow controller
  • RN-D: Volume flow controller with acoustic cladding
  • RN-FL: Volume flow controller with flanges on both ends
  • RN-D-FL: Volume flow controller with acoustic cladding and flanges on both ends
  • Units with acoustic cladding and/or a secondary silencer Type CA, CS or CF for demanding acoustic requirements
  • Acoustic cladding cannot be retrofitted

 

Construction

  • Galvanised sheet steel
  • P1: Powder-coated, silver grey (RAL 7001)
  • A2: Stainless steel

 

Parts and characteristics

  • Ready-to-commission controller
  • Damper blade with low-friction bearings
  • Bellows that acts as an oscillation damper
  • Cam plate with leaf spring
  • Scale with pointer to set the volume flow rate setpoint
  • Aerodynamic function testing of each unit on a special test rig prior to shipping
  • Correct operation even under unfavourable upstream conditions (1.5 D straight section required upstream)

 

Attachments

  • Min/Max actuators: Actuators for switching between minimum and maximum volume flow rate setpoint values
  • Modulating actuators: Actuators for the stepless adjustment of volume flow rates or to switch between minimum and maximum volume flow rate setpoint values
  • Retrofit kits: Actuators and installation accessories
  • Variant RN-S cannot be combined with an actuator

 

Accessories

  • Lip seals on both ends (factory fitted)
  • Matching flanges for both ends

 

Useful additions

  • Secondary silencer Type CA, CS or CF
  • Heat exchanger Type WL
  • Electric air heater Type EL

 

Construction features

  • Circular casing
  • Spigot suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for lip seal (RN-P1/80 and RN-A2/80 without groove)
  • RN-FL: Circular flanges to EN 12220

 

Materials and surfaces

Galvanised sheet steel construction

  • Casing made of galvanised sheet steel
  • Interior parts, nominal sizes 80 – 125: stainless steel 1.4301, nominal sizes 160 – 400: galvanised sheet steel
  • Polyurethane bellows
  • Plain bearings with PTFE coating
  • Leaf spring made of stainless steel

 

Powder-coated construction (P1)

  • Casing made of galvanised sheet steel, powder-coated
  • Interior parts, nominal sizes 80 – 125: stainless steel 1.4301, nominal sizes 160 – 400: galvanised sheet steel, powder-coated

 

Stainless steel construction (A2)

  • Casing made of stainless steel 1.4301
  • Interior parts made of stainless steel

 

Variant with acoustic cladding (-D)

  • Acoustic cladding made of galvanised sheet steel
  • Rubber profile for the insulation of structure-borne noise
  • Lining is mineral wool

 

Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC

 

Standards and guidelines

  • Hygiene conforms to VDI 6022
  • Casing air leakage to EN 1751, class C

 

Maintenance

  • Maintenance-free as construction and materials are not subject to wear

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