CAV controller variant RN
Circular self-powered volume flow controllers for the control of supply air or extract air in constant air volume systems
Optional equipment and accessories
Application
Special characteristics
Nominal sizes
Variants
Units with acoustic cladding for demanding acousti requirements
Construction
Parts and characteristics
Attachments
Accessories
Useful additions
Construction features
Materials and surfaces
Powder-coated variant (P1)
Stainless steel variant (A2)
Variant with acoustic cladding (-D)
Mineral wool
Standards and guidelines
Maintenance
Disclosure of Chemicals
Functional description
The volume flow controller is a mechanical self-powered unit and works without external power supply. A damper blade with low-friction bearings is adjusted by aerodynamic forces such that the set volume flow rate is maintained within the differential pressure range.
The aerodynamic forces of the airflow create a closing torque on the damper blade. The bellows extends and increases this force while at the same time acting as an oscillation damper. The closing force is countered by a leaf spring that unrolls over a cam plate. The shape of the cam plate is such that a change in the differential pressure leads to an adjustment of the damper blade in a way that the volume flow rate is maintained almost exactly.
Efficient commissioning
The volume flow rate setpoint value can be set quickly and easily using the pointer on the external scale; no measurements are required.
The advantage over flow adjustment dampers is that there is no need for repeat measurements or adjustments by an air conditioning engineer. Should the system pressure change, e.g. by opening or closing of duct sections, the flow rates in the entire system will also change if flow adjustment dampers are used; however, this is not the case with mechanical self-powered volume flow controllers A mechanical self-powered controller reacts immediately and adjusts the damper blade such that the set constant volume flow rate is maintained.
Volume flow rate ranges
The minimum differential pressure of CAV controllers is an important factor in designing the ductwork and in rating the fan including speed control.
Sufficient duct pressure must be ensured for all operating conditions and for all control units. The measurement points for fan speed control must be selected accordingly.
Nominal sizes | 80 – 400 mm |
Volume flow rate range | 11 – 1400 l/s or 40 – 5040 m³/h |
Volume flow rate control range | Approx. 25 to 100 % of the nominal volume flow rate |
Scale accuracy | ± 4 % |
Minimum differential pressure | 50 Pa (nominal size 80: 100 Pa) |
Maximum differential pressure | 1000 Pa |
Operating temperature | 10 – 50 °C |
| RN | - | P1 | / | 100 | / | D2 |
| | | | | | | | | |||
| 1 | 2 | 3 | 4 |
1 Type
RN-S Compact-height volume flow controller
2 Material
No entry: galvanised sheet steel
P1 Powder-coated RAL 7001 (silver grey)
A2 Stainless steel construction
3 Nominal size [mm]
80, 100, 125
4 Accessories
No entry: without accessories
D2 Double lip seal both ends
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Tel.: +420 283 880 380 | Fax: +420 286 881 870
Kontakt
Jsme tu pro vás
Uveďte prosím své sdělení a druh dotazu
Tel.: +420 283 880 380 | Fax: +420 286 881 870
Kontakt
Děkujeme vám za zprávu!
Vaše zpráva je odeslána a zakrátko bude zpracována.
Naše oddělení pro servisní dotazy se s vámi co nejrychleji spojí Pro obecné informace o výrobcích nebo o službách můžete také zavolat:
Tel.: +420 283 880 380 | Fax: +420 286 881 870
