Multileaf dampers Type JZ-HL For low-leakage shut-off in air conditioning systems 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 ■■ Maximum dimensions 2000 × 1995 mm ■■ Closed blade air leakage to EN 1751, classes 1 – 2, depending on size ■■ Casing air leakage to EN 1751, class C ■■ Aerofoil opposed action blades ■■ Blades interconnected by external linkage ■■ Available in standard sizes and many intermediate sizes Optional equipment and accessories ■■ Actuators: Open/Close actuators, modulating actuators ■■ Explosion-proof construction with pneumatic actuator or spring return actuator ■■ Powder-coated construction

Multileaf dampers General information Type JZ-HL 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-HL are used as ​ an acting element in the volume flow and ​ pressure control in air conditioning systems – For low-leakage shut-off of ducts and openings ​ in walls and ceiling slabs – Powder-coated construction with increased ​ corrosion resistance if required – Steel and stainless steel variants with brass...

Multileaf dampers General information the blade position (not for attachment ZS99) – With drive shaft as an attachment: For the ​ position of the drive shaft see 'Dimensions and ​ weight' – With actuator as an attachment: The actuator is ​ attached to the second blade from the top – Travel stop (angle section) ensures tight ​ closure of the top and bottom blades – Blade tip seals – Construction and materials comply with the EU ​ directive and guidelines for use in potentially ​ explosive atmospheres (ATEX) for variants with ​ brass or stainless steel bearings (-M, -E) Materials and surfaces –...

Multileaf dampers Functional description Multileaf dampers with external linkage can have ​ parallel action blades or opposed action blades. An external linkage transfers the synchronous ​ rotational movement from the drive arm to the ​ individual blades. Even very large multileaf ​ dampers can be safely opened and closed with ​ this type of linkage. Opposed action blades close at different speeds ​ since the linkage includes a transverse link. This ​ facilitates the closing process and reduces the ​ closed blade air leakage. Schematic illustration of JZ-HL ① Casing ② Opposed blades ③ Blade tip...

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 × H) of ​ 1 m². The differential pressures apply to multileaf ​ dampers installed in ducts (installation type A). JZ-LL, JZ-LL-A2, JZ-HL, differential pressure and sound power level v m/s...

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-HL Low-leakage multileaf damper, closed ​ blade air leakage to EN 1751, class 1 – 2  Installation subframe No entry: none ER With (only for construction G)  Duct connection No entry: corner holes on both sides G Flange holes on both sides (no corner ​ holes)  Attachments No entry: none Z04 – Z07 Quadrant stay Z12 – Z51 Actuators ZF01 – ZF15 Spring return actuators Z60 – Z77 Pneumatic actuators  Bearings No entry: plastic bearings M Brass bearings E Stainless steel bearings  Construction of blades Only for steel or stainless steel multileaf ​ dampers...

Multileaf dampers Quadrant stays and limit switches Order code detail Z04 Z05 Z06 Z07 Open/Close actuators Order code detail Quadrant stay Quadrant stay Quadrant stay Quadrant stay Open/Close actuators, spring return Order code detail Supply voltage on/off Supply voltage on/off Supply voltage on/off Supply voltage on/off Supply voltage on/off Supply voltage on/off Supply voltage on/off Supply voltage on/off Damper blade position CLOSED Damper blade position OPEN Damper blade positions CLOSED nad OPEN Supply voltage Torque Auxiliary switch 100 – 240 V AC Supply voltage Supply voltage on/off Supply...

Multileaf dampers Modulating actuators Order code detail Z20 Z21 Z51 Modulating actuators, spring return Order code detail ZF05 ZF10 ZF15 Supply voltage Auxiliary switch Supply voltage Auxiliary switch Double acting pneumatic actuators, including explosion-proof actuators Order ​ code ​ detail Mea­ ning Damper blade safety func­ tion Operating pres­ sure