Multileaf dampers Type JZ-LL-AL Opposed blades Multileaf dampers made of aluminium for extremely ​ low-leakage shut-off in air conditioning systems Rectangular multileaf dampers for volume flow and pressure control as well as for ​ extremely low-leakage shut-off of ducts and openings in walls and ceiling slabs ■■ Maximum dimensions 1200 × 1000 mm ■■ Closed blade air leakage to EN 1751, class 4 ■■ Casing air leakage to EN 1751, class C ■■ Aerofoil opposed action blades ■■ Closed cell side seals meet increased hygiene requirements Closed cell side seals ■■ Blades interconnected by gears ■■ Available in standard sizes and many intermediate sizes Optional equipment and accessories ■■ Actuators: Open/Close actuators, modulating actuators ■■ Powder-coated construction ■■ Anodised constructi

Multileaf dampers General information Type JZ-LL-AL Page General information Function Technical data Quick sizing Specification text Order code Attachments Dimensions and weight Product details Installation details Basic information and nomenclature Application – Multileaf dampers of Type JZ-LL-AL are used ​ as an acting element in the volume flow and ​ pressure control in air conditioning systems – For extremely low-leakage shut-off of ducts and​ openings in walls and ceiling slabs – Powder-coated construction with increased ​ corrosion resistance if required Special characteristics – Aerofoil...

Multileaf dampers General information Maintenance – Maintenance-free as construction and ​ materials are not subject to wear – Contamination should be removed as it may ​ JZ-LL-AL lead to corrosion and to increased closed ​ blade air leakage

Multileaf dampers JZ-LL-AL The internal gears transfer the synchronous ​ rotational movement from the drive arm to the ​ individual blades. Functional description Multileaf dampers with gears can only have ​ opposed action blades. Schematic illustration of JZ-LL-AL ① ② ① Casing ② Encased gears ③ Opposed blades ④ Side seal ⑤ Blade tip seal ⑥ Actuator ⑦ External linkage (from H = 600 mm) ⑧ Bearing plate with

Multileaf dampers The torque for closing a multileaf damper must be such that the damper can be safely opened and closed. For closure, the torque must suffice to ensure complete shut-off by the blades. Opening is initiated without aerodynamic forces. When air flows through the damper, the aerodynamic forces of the airflow create a closing force (torque) on the blades; this happens independent of the direction of the airflow. This closing force must be countered, or overcome. The blade position, or blade angle a, for which there is the largest torque depends, among other factors, on the fan characteristics....

Multileaf dampers Quick sizing Quick sizing tables provide a good overview of the sound power levels and differential pressures that can be expected. Approximate intermediate values can be interpolated. Precise intermediate values and spectral data can be calculated with our Easy Product Finder design programme. The sound power levels LWA apply to multileaf dampers with a cross-sectional area (B x H) of 1 m2. The differential pressures apply to multileaf dampers installed in ducts (installation type A). JZ-LL-AL, differential pressure and sound power level Installation type A Installation type...

Multileaf dampers Specification text This specification text describes the general ​ properties of the product. Texts for variants can be ​ generated with our Easy Product Finder design ​ programme. Rectangular multileaf dampers for volume flow ​ and pressure control as well as for low-leakage ​ shut-off of ducts and openings in walls and ceiling ​ slabs. Ready-to-operate unit which consists of the ​ casing, aerofoil blades and the blade mechanism. Flanges on both sides, suitable for duct ​ connection. The blade position is indicated externally by a ​ notch in the blade shaft extension. Closed...

Multileaf dampers Order code  Type JZ-LL-AL Low-leakage multileaf damper ​ made of aluminium, closed blade air ​ leakage to EN 1751, class 4  Nominal size [mm] B × H  Installation subframe No entry: none ER With installation subframe  Attachments Z04 Quadrant stay Z05 – Z07 Quadrant stay and limit switches Z12 – Z51 Actuators ZF01 – ZF15 Spring return actuators Z60 – Z77 Pneumatic actuators  Damper blade safety function Only for spring return actuators or ​ pneumatic actuators NO Pressure off/power off to OPEN NC Pressure off/power off to CLOSE  Surface No entry: standard construction P1...

Multileaf dampers Quadrant stays and limit switches Order code detail Quadrant stay Quadrant stay Quadrant stay Quadrant stay Open/Close actuators Order code detail Limit switch Function Damper blade position CLOSED Damper blade position OPEN Damper blade positions CLOSED nad OPEN Supply voltage Auxiliary switch Minimum torque of multileaf damper has to be considered when selecting the actuator. Open/Close actuators, fast-running Order code detail ZS21 ZS22 Open/Close actuators, spring return Order code detail Supply voltage Supply voltage on/off Supply voltage on/off Supply voltage on/off Supply...

Multileaf dampers Modulating actuators, spring return Order code detail ZF05 ZF10 ZF15 Damper blade safety ​ function – Power off to close/open Power off to close/open – Power off to close/open Power off to close/open – Power off to close/open Power off to close/open – Power off to close/open Power off to close/open Supply voltage Auxiliary switch Minimum torque, depending on nominal size of multileaf damper and the operating pressure have to be ​ considered when selecting the actuator. Single acting pneumatic actuators Order ​ Mea­ code detail ning Z72 Damper blade safety function Power off...

Multileaf dampers JZ-LL-AL, standard sizes JZ-LL-AL, standard sizes H mm Position of drive shaft JZ-LL-AL, intermediate sizes

Multileaf dampers JZ-LL-AL, intermediate sizes H mm Position of drive shaft

Multileaf dampers Product details – Drive shafts (special accessory) upon request Aluminium multileaf dampers, corner holes B + 76