LEO

  • New regulator handles larger working area
  • Low noise level
  • Pressure independent
  • Short overall length
  • High measurement accuracy
  • Can be installed directly in bend
  • Flexible sound attenuator choice
  • Separate service tool, PC-Tool and ZTH by Belimo
  • APPLICATION
  • Description
  • INSTALLATION
Leo is a volume fl ow controller which works independently of the duct pressure. It is the desired air fl ow rate at choked damper that determines the duct pressure required for the applicable unit/string. The VAV unit is based on dynamic measurement of volume fl ows, and controls the damper position to maintain the air fl ow rate required. When a change in duct pressure occurs, such as when other volume fl ow controllers on the branch open or close, the unit will compensate by adjusting the damper until the correct volume fl ow has been restored. The required air fl ow rate can, for example, be provided as a 0-10V signal from room thermostat / CO² sensor in the occupied zone covered by the unit. Minimum and maximum air fl ow rates can be set at the factory or during installation by using a service tool from Belimo. The VAV unit is designed to provide comfort ventilation at temperature conditions of between 0°C and 50°C and a relative humidity between 5% and 95% without condensation. A 4-conductor cable connects the controller to various control equipment in the room. Consistent use of a common reference system for all equipment is important. For the VAV controller, cable no. 1 is system-0. All control and measurement signals are linked up in accordance with this. Wiring diagram for Leo in combination with various room control equipment is available at our website. For energy-effi cient operation, VAV systems are equipped with pressure sensors in the ductwork, which transmit control signals to branch dampers or to the fan frequency control. Please see schematic diagram in fi g.1.

Design

Leo VAV is a complete measuring and control unit where the air fl ow rates in ventilation systems can be set as required. At the measuring station, the diff erential pressure is measured via measuring rod integrated in the unit. The unit is installation-friendly in terms of straight ducting, and can thus be mounted in most ductwork sections. It is fully compliant with air permeability class 4 for damper in closed position, and class C for leakage to the surroundings. Leo is equipped with VAV controller from Belimo or Siemens. Controller specifi cations are provided in the table below. Full technical documentation can be downloaded from our website www.trox.no Belimo LMV/NMV-D3 is used as analog control or for MP-bus. Belimo LON or MOD-bus controller is also available. For KNX, Belimo LMV-D3-KNX and NMV-D3-KNX is available. If additional protection against structure-borne noise is required, e.g. for open installation, the unit can be delivered with external insula- tion and casing. This will reduce the level of noise emitted from the actual unit at high choke pressure and high velocity past the damper. However, this should be followed up with additional protection against structure-borne noise from the duct at both sides of the unit. Please see acoustic datasection. The LEV sound attenuator is designed for VAV systems, and is available in 500mm and 1000mm lengths. LEV has a full attenuator cross-section, and this ensures a low-level pressure loss. It is insulated with mineral wool featuring a reinforced top layer to prevent fi bres breaking away with the supply air. An extraction unit with mesh grille, ASN, in the same design as LEV is also available. Leo-D, LEV and ASN can be delivered pre-assembled with ducting clips and are equipped with adjustable brackets from factory.
Materials and surface Coating

Leo comes in a galvanized steel design. The measurement unit is in aluminium. Tubing, nipples and motor casing are in plastic. Leo’s connection collars are fi tted with EPDM rubber gaskets. LEV is made of galvanised steel, and comes with mineral wool and a glass fi bre layer as attenuation material. Connection collars are fi tted with EPDM rubber gaskets. ASN is made of galvanised steel and is equipped with an EPDM rubber gasket on the connection collar. 
In order to maintain the system’s measurement accuracy, it is important to install units with spacing as shown in fig. 10. For installation of Leo, a service clearance in accordance with fig. 11 is recommended. For extract air with silencer towards romside it is recommended 5xDia. as distance to Leo. (Nb. Use a muffler without center baffle or other restriction.)

Technical information

  • Order Code
  • Quick Selection
  • FUNCTION
Leo will always adjust to the air fl ow rate consistent with the signal transmitted from the room control equipment. The VAV unit comprises an adjustable damper and measuring station for air fl ow rate, and the measurement principle is dynamic measurement of the air fl ow. In the damper motor’s control unit, should the admission for the damper is regulated according to the desired should-value. Leo has an adjust- ment range shown in table 2.
Deviation for working range 10 - 20% of Vnom:±25%
20 - 40%: <±10%
40 - 100%: <±4%
If T-pipes are used, a spacing of at least 5 x ØD is recommended in order to maintain the measurement accuracy.

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Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265