FAQ 2017-07-18T16:04:43+00:00


The calibration curve is the maximum possible canal velocity which the volumetric flow controller can handle. SCHAKO sets this value at 12 m/s as standard.

Fault or alarm signals can be transmitted to other devices using the potential-free change-over contacts on the relay module. However, it is not possible technically to distinguish between alarm and fault signals.

Every elevator company or any company authorised to work in elevator shafts can install a GREENKIT system. The system is provided as a plug-in version. Manual skills are, of course,of benefit here - no question.

When placing volumetric flow controllers, straight flow sections are to be placed prior to the volumetric flow controllers as a matter of principle, which have at least 1 x diameter for round controllers and at least 1 x diagonal for rectangular controllers. Different straight flow sections are to be used for different building components (arches, fire dampers, silencers etc.) (see brochure documents).

At SCHAKO, the ordering dimensions and ordering sizes of all ventilation grilles correspond to the required installation openings of buildings. The K8 in size 315x115 therefore requires an installation opening with the dimensions 315mm by 115mm.

You can find the current list of delivery times here. The delivery times for all available SCHAKO products are updated daily.

The difference is, that in contrast to the static sensor, the medium flows over the dynamic sensor in the canal. This is why a static sensor needs to be used in case of dirty or aggressive are in the canal.

The filter cells should always be replaced when the filter cells have been damaged or once the maximum defined end pressure loss reaches 500 Pa. In addition, the regular replacement of filter cells makes sense for economical reasons to minimise the energy requirements for ventilation. One should also take the hygienic framework conditions into account, the local maintenance plans as well as the legal guidelines - see also VDI 6022.

New SCHAKO filter cells have an initial pressure loss of 250 Pa at nominal volume. SCHAKO recommends replacing the filter when the end pressure loss rteaches the limit of 500 Pa during running operation at nominal volume. This is the only way to avoid unnecessary energy losses in the air feed zone due to increased air feed.

The filter leakage test according to DIN EN ISO 14644-3 is a test of the entire filter system: the filter medium, the filter frame and the filter frame seal. The test is conducted with calibrated measuring probes employing an in-situ scanning process - and serves to confirm the correct installation of the filter system and to check that no leaks have occurred during operation.

In the seal leakage test the leakage volume flow from the cavity of the test groove is measured at an overpressure of 2000 Pa. This leakage volume flow must not exceed a maximum of 0.003 % of the nominal volume flow. However, this test does not measure freedom from leakage of the filter element. This needs to be conducted separately with the terminal filter cells from H13 using the leakage test according to DIN EN ISO 14644-3 as well as DIN 1946-4, VDI 2083 and DIN EN ISO 14644.

Although comparable in terms of optics, the filter units FKU and FK-FF are structurally different. Depending on size, the FK-FF can be up to 20 mm higher. However, the applications are similar. FKU and FK-FF differ in the sealing technology of the filter cells. The SCHAKO FKU requires a filter cell with dry sealing, either as flat seal or as U-profile seal. This allows a seal leakage test according to VDI 3803, Sheet 4. The SCHAKO FK-FF filter unit uses a gel seal in place of the filter unit with dry seal. The seal fit of filter cells from Class H13 is performed via leakage test.

The oil thread test is the standard test method for all SCHAKO filter cells and corresponds to DIN 1822-4 in terms of execution. The scan test also complies with this standard and can be conducted upon request and at additional cost.

The smoke detector system does not have an independent bus interface.

In the case of standard volumetric flow controllers we are speaking of slow runners with a runtime of 150 seconds for a 90 degree damper adjustment. Special volumetric flow controllers with fast drives are available with considerably quicker runtimes below 3 seconds for a 90 degree damper adjustment.

Both controllers are identical in function, with one difference: MP controllers are bus-compatible, that means, the damper position can be outputted by the controller and passed to another control. This function is not incorporated in MF controllers. MF controllers are therefore not bus-compatible.

In this control function, the integrated CAV / VAV control function is disabled and the controller operates as permanent actuator with integrated volumetric flow sensor.

There are two ways of changing the programmed control values on site, either via a PC tool or via a diagnosis/service device. Both methods allow subsequent adaptation of Vmin, Vmax and the controller mode. However, it is not possible to change the nominal volume flow (calibration curve). This can only be done by the manufacturer of the volumetric flow control box.

The volumetric flow controllers can be controlled via switch contacts. This is known as CAV operation (constant air volume). Control is not executed via a constant 0 - 10 V signal, the switch contacts then control via various control conditions such as positive CLOSED, Vmin, Vmax or OPEN.

If the feedback signal is fed back to the switching cabinet via cable, then the controls in the switching cabinet can interpret and process this signal. Accordingly, this allows setting subsequent, corrective control settings to be made directly from the switching cabinet, depending on operator requirements.

The control signal and the feedback signal will only correspond when Vmin = 0 m³/h (0%) and Vmax = Vnom (100%) are programmed

In the case of deficient air, i.e. low air volume in the ventilation unit, the volumetric flow controller moves to the maximum open position to keep the flow resistance as small as possible. The damper blade is therefore wide open.

In general, the SCHAKO volumetric flow controllers can be used throughout the temperature range 0 Celsius to 50 Celsius.

Acoustic cladding with 20 mm thickness (DS20mm) as well as flat bed acoustic cladding with 2 mm thickness is available for the volumetric flow controllers VRA-R-E, VRA-R-E-Smart and VM-PRO-R. Only acoustic cladding with 40 mm thickness (DS40mm) is available for the volumetric flow controller VRA-Q-E. Only acoustic cladding with 20 mm thickness (DS20mm) is available for the volumetric flow controllers VRA-Q-E-Smart and VM-PRO-Q.

The feedback signal is an analogue voltage signal and always relates to the nominal volumetric flow of the volumetric flow controller. If the nominal volume (Vnom) is controlled, then the controller returns 10 V, at 0 m³/h the controller either returns 0 V (controller mode 0 - 10 V) or 2 V (controller mode 2 - 10 V).

Control is the analogue signal of a sensor or a facility management technology for volumetric flow controllers. Depending on the mode of the controller (0-10V or 2-10V), the controller reacts differently to this trigger (see Point 1).

In control mode 0 - 10 V, Vmax is controlled at 10 V and Vmin at 0 V, in control mode 2 - 10 V, Vmax is controlled at 10 V and Vmin at 2 V.

Thermal yes, as the outer and inner insulation of the connection box consists of ARMAFLEX - a flexible insulation material to prevent condensation with a micro-cell structure for good dimensional stability. The high water vapour diffusion resistance reduces energy loss and the risk of corrosion underneath the insulation.

According to legal requirements, the responsibility for the functional safety of a smoke detector rests with the operator. Accordingly, SCHAKO recommends a functional test at least 1 per annum. The test itself must be conducted according to the requirements of the technical documentation. We therefore refer to the current smoke detector documents.

The covering disc of the RMS smoke detector is made of polyamide. The impression of being glass results from the high transparency level.

The connection plans and the contact assignment are part of the technical documentation of the RMS and are available on the Internet site of SCHAKO, here.

Unfortunately, direct control of several fire dampers is not possible with this system. It is however conceivable to facilitate this application by cascading (relay and/or contactor). Cascading is then performed by the potential-free change-over contacts of the relay module.

The two reports [fault] and [alarm] are different in principle. The error report can be reset. This occurs automatically with the RMS as soon as the reason for the fault has been resolved. An alarm report however, needs to be reset manually by the operator using the reset key. The corresponding LED displays and reset keys are located on the RM relay module.

No. Membrane absorber baffles are only available with a thickness of 100 mm.

SCHAKO silencing baffles are fitted with a nozzle-shaped frame profile for significant reduction of pressure loss. Additional flow plates are therefore not required.

The Metu profile M2 and M3 is used as standard. Upon request, and at no extra cost, versions with Metu M2 and Metu M4 can also be supplied. The Metu profile M2 is standard for the additional silencers ZSQ for VM-PRO-Q and Metu profile M3 for VRA-Q.

Smoke extraction is cold smoke extraction to remove the smoke from a building after a fire. Accordingly, smoke extraction is not safety-relevant (Building Rules List C Part 3.10). Smoke ventilation is smoke extraction in the case of fire including heat ventilation, (EN 12101 - Part 2). A smoke ventilator is thus a safety-relevant building product and listed in the Building Rules List B Part 1.

No. An NRWG is not intended for installation in a duct system or for connecting to a duct and may not be used for these applications.

The two types differ by their application (depth of housing). The JK-180MB is suited for flush wall and ceiling installation and equipped with an additional installation panel. The JK-190 has a deeper housing and is intended for surface installation. The deeper housing avoids brushing of the slats on the brickwork (wear and tear).

Aerodynamically effective means that the behaviour of the flow leaving the opening must have certain characteristics across the opening area. An NRWG only ventilates via this autonomous, natural flow behaviour - entirely without motorised support. Not all partial areas of the opening area are relevant for this flow characteristic. The effective opening area Aa - also referred to as the aerodynamically relevant opening area - is determined with an experimental method. More details are given in Appendix B of the standard EN 12101-2.

There are four different modes of operation for smoke and heat controls:

  • NRA – natural smoke removal systems: equipment for ventilating smoke through natural buoyancy in case of fire
  • MRA – automated smoke extraction systems: equipment for the automated extraction of smoke with fans
  • RDA – smoke protection pressure systems: equipment to prevent the penetration of smoke and to ventilate smoke via pressure difference
  • WA – thermal extraction: equipment for the natural or automated ventilation of heat

An NRWG always consists of a louvre damper, a roof flap or a dome light, and in addition every NRWG has a dedicated opening mechanism and an autonomous trigger unit. According to EN 12101-2, all marketed NRWGs must be CE-certified. The dimensions, requirements and installation of natural smoke removal systems (NRA) are governed by DIN 18232-2.

An NRWG is a central component of a so-called RWA - a smoke and heat extraction unit. The RWA is a safety equipment for preventive fire protection and, in case of a fire, serves to extract smoke and hot gases from a building or structure.

NRWG is an abbreviation for natural smoke and heat extractor and implies for what is was developed.

It is not a sound idea in terms of climate to ventilate an elevator shaft towards the interior of a building. This will immediately be regarded as a confrontation with active fire protection as well as hygiene regulations. The accumulation of cold air inevitably leads to mould and moist areas. The thermal balance in the building is interrupted. It is better to follow proven air-conditioning principles and to combine these with intelligent control electronics. For example, with the GREENKIT from SCHAKO.

No. Using an elevator as active ventilation shaft is illegal. Ventilation and smoke extraction must be separate units as these two systems could be competitive in case of emergencies. Extraction with a fan is strictly prohibited in elevator shafts.

A cabin has no real pump effect. At hardly 1.6 metres/sec the velocity of the cabin is far too slow. And the usual distance between the cabin and the elevator shaft is also too big.

Yes. All elevator shafts can be equipped with a GREENKIT. In new buildings it is sufficient to provide the necessary space for an integrated ventilation module in the shaft ceiling or wall.

A single visual inspection of the GREENKIT system once a year is perfectly adequate. The system manual describes the maintenance work to the smoke detector system.

The chimney effect tends to be rather small for buildings with 1 or 2 floors. The legally required minimum opening in the elevator shaft remains the only ventilation opening in a low energy building. In this situation there are other factors which relate to the benefit of GREENKIT. The three following examples underline the relevance of installing GREENKIT.

  • in private houses there are often no fire compartments between the elevator shaft and the rest of the building. Natural ventilation draws the air upwards and creates underpressure. There is a constant interplay between hot and cold. This situation is aggravated in the summer, as air conditioning favours the entry of heat due to the generation of fresh air. Without fire compartments, the heat of the summer and the cold of winter enter the rooms directly, which leads to significantly higher energy requirements.
  • buildings which are poorly insulated, generate high thermal losses. GREENKIT allows these losses to be reduced.
  • in buildings for commercial use (regular coming and going) the elevator is in constant use. This airflow increases the penetration of cold air which makes the installation of a GREENKIT even more relevant.

The GREENKIT system provides optimised ventilation with alternating opening and closing cycles, but only when it really makes sense, for example, in the case of smoke, maintenance work, emergencies or when the elevator is in use. Intelligent control electronics detect the prevailing conditions and react accordingly.

No, special fire dampers are required by the authorities for commercial kitchen ventilation. Of course SCHAKO also offers suitable products for this application: the shut-off device FIRESAFE®II K90.

The SCHAKO fire damper models BSK-RPR can also be retrofitted for motor damper return on the building side. SCHAKO has prepared conversion instructions which you can download as PDF here, here and here. Please see the instructions for more details.

The SCHAKO fire damper models BKA-EN can also be retrofitted for motor damper return on the building side. SCHAKO has prepared conversion instructions which you download as here and here. Please see the instructions for more details.

SCHAKO provides corresponding fusible links for many fire dampers, for example, when the fusible link has been triggered during inspection of the dampers. A list of replacement fusible links can be found here.

The quickest way to find the appropriate PDF documents for immediate download is on the SCHAKO Internet homepage in the product area. Should you not be able to find the product you are looking for, then send us a mail. We will then send you a CD with PDFs.

The replacement of asbestos-containing stop seals as part of partial sanitation is possible out for many SCHAKO products. SCHAKO can supply the corresponding replacement seals for nearly all supplied fire dampers. Special customer information on the partial sanitation of old fire dampers is available for download as PDF document here.

Yes, that is possible. However, the fan convectors must then be equipped with constant EC controls, and this can be supplied by SCHAKO for virtually all fan convectors upon request.

In general, the inspection openings must be approximately 100 mm larger than the corresponding equipment in order to be able to conduct all required maintenance as per VDI 6022.

SCHAKO fan convectors can also be combined with many other SCHAKO air diffusers. However, it is essential to take into account the required pressure losses in fan convector design.

The maximum external pressure for the SCHAKO Aquaris Silent fan convector is approximately 70 Pa, for the SCHAKO NBS 100 fan convector from 5 to 150 Pa and for the SCHAKO NBS 150 fan convector from 40 to 250 Pa.

As a rule, you can find the exact ratio of these two values Vmax and Vmean directly in the corresponding diagram, or alternatively in the key of the technical documentation on the SCHAKO product.

Yes there is, as a project-related special solution at extra cost.

Yes, this works, especially when the installed filter box has the usual standard dimensions for ceiling grid. Then the SCHAKO ceiling displacement diffuser DAV-F will fit third party products without problems.

The use of SCHAKO induction units allow planners great flexibility. Up to an individual length of 3000 mm the induction units can be adapted quite flexibly to the corresponding ceiling grid. If greater lengths are required, several linked units can be supplied as band design.

This depends on the performance required. SCHAKO recommends a spread of 3-4 degrees.

This is simple to calculate: at a room temperature of 26 degrees Celsius and 50 per cent relative humidity the dew point is exactly 14.77 degrees. Accordingly, the water inlet temperature can be up to 16 degrees Celsius. Up to this level you will be on the safe side with all devices. Planning tasks with intended lower water inlet temperatures require induction units fitted with condensate pans, for example, the SCHAKO models DISA-W and DISA-WSP. The SCHAKO induction units DISA-300, DISA-601, DISA-360, DISA-B and DISA-H are only supplied without condensate pans and must therefore generally be operated in condensate-free zones, in other words, always above the critical dew point.

The SCHAKO induction units with condensate-free cooling are virtually maintenance-free. Cleaning of the heat exchangers is usually conducted according to the visible degree of soiling. There is no prescribed maintenance cycle. The maintenance regulations of VDI 6022 apply to induction units with a condensate pan.

Of course. This function is standard for all SCHAKO induction units. The planner must however, take into account that a reliable heating function can only be guaranteed for a maximum installation height of 3 metres. At the same time, and for technical reasons, the water inlet temperature must have a maximum of 40 degrees Celsius.

To ensure safe functioning, SCHAKO defines a pressure loss of at least 40 Pa for all induction units. This guarantees faultless function.

Normally, no. Inspection or maintenance openings are normally only required for building elements and equipment which are equipped with control components

The EasyBus system can also be wired and installed using a commercially available round cable with a core cross section of 2.5 mm or with standard cables. However, those aware of the advantages of the EasyBus quick cables will rarely resort to the old wiring technology. This saves time and money. In addition, the flat band cables preclude incorrect wiring of the modules.

128 modules can be connected per master. Each module is fitted with an approx. 1.5 m long cable. At a maximum of 200 metres direct device feed, the maximum remaining length of the flat cable is approximately 800 metres.

For safety reasons SCHAKO recommends the use of halogen-free cables. The EasyBus system can, of course, also be equipped and configured with conventional PVC cables. The technical performance is identical for both types of cables. Halogen-free cables offer an number of advantages, which may prove crucial, depending on the application. In case of fire, halogen-free cables do not generate corrosive gases, have have a considerably lower fire load than PVC cables, and generate less smoke. In addition, they are resistant to hydrochloric acid within normal limits. For these reasons halogen-free cable sheaths are increasingly used for data cables.

The modules can be well distinguished by their appearance and their interior. In addition, each module board bears an accurate type designation. A skilled person will therefore experience no difficulties during installation.

The EasyBus components are certified to protection class IP 40. Hence, they are protected against penetration of so-called solid bodies up to a diameter of 1 mm. Protection against the penetration of water is not intended at IP 40, as EasyBus components are defined for use in a dry environment - which, by the way, applies to all electronic assemblies which do not need to be designed for a moist environment.

A modern and flexible bus system like EasyBus cannot be commissioned by unskillled persons. This applies to all conventional bus systems. This requires skilled personnel. Only these can guarantee faultless function. Software intervention is always necessary, same as for a PC which the customer requires for a specific application. However, bus system novices can undertake certain preparatory work. Commissioning and configuration must always be carried out by skilled personnel.

The EasyBus system is flexible in terms of adaptations or extensions. Modules can be expanded at any time within the specifications.

The EasyBus system is hardly influenced by parallel power supplies. The EasyBus system is a powerline system which transmits its data packs in an energised environment. Nonetheless, it is recommended to separate the bus line from the high voltage line. If in doubt, use a shrouded bus line.

It really makes no sense to control a single user via a bus system. The idea behind a bus system is the flexible control of many, and in particular, very different devices and components via a minimum number of cores. This is what bus systems have been developed for and for which they are perfectly suited. Here too, it always depends on the object.

Of course, the initial costs are high. And a bus system with only 10 fire dampers will hardly prove economical. One always has to counterbalance the cabling effort required when using a conventional system. A bus system is always more flexible and convenient than conventional wiring, was cannot only be weighed in monetary terms.

Only the cable sheathing is scored selectively or perforated slightly. The cable strand remains intact for power and data transmission under all circumstances. If one wants to insulate the scored part after shifting the connecting socket, one can use conventional insulation tape for flat cables. Alternatively: one places and additional connecting socket and leaves the previous socket in the present position. This is also possible.

The ideal type of cable for the EasyBus system is the multi-core flat cable which is nearly always used at SCHAKO. In conjunction with the connection or feed socket this allows quick and error-free cabling. However, other cables with a cross section of 2.5 mm can also be used in principle.

The decision in favour of a bus system does not necessarily depend on the number of installed components. Often there are planning, technical or legal requirements which cannot be implemented without a bus system. A major advantage here is the remote control function of EasyBus.

Generally speaking, the installation costs and equipment management with an EasyBus system become more efficient, the larger the number of installed components. On the one hand this is because a bus system only requires shorter cable lengths. Installation is easier and the entire cable harness is considerably shorter as only one cable needs to be laid for the EasyBus. Depending on the planning, EasyBus can already pay off with the smallest of plants.

The decision for a bus system is not necessarily a decision in terms of economics. The reason being, that certain control situations cannot be represented with conventional systems. If the costs for a conventional system are known, it is always worth planning in parallel with the SCHAKO EasyBus system. In the case of comparable costs, upgradability and the needs of the customer are the deciding factors. Because this is where the EasyBus system is supoerior to a conventional system on all counts.

The electrical drives used by SCHAKO always have a connection diagram directly on the drive housing. In addition, the original documentation of the drive manufacturer is always enclosed with each delivery. However, it can not always be guaranteed that this has been lost. Upon request we can send you the connection documents again. To do this, we require either the order number, the delivery note number or the number of the SCHAKO invoice.

No special sizes or special designs are included in the SCHAKO design programme and the technical documentation of the products. However, based on decades of experience, special sizes and customised designs can be calculated quite accurately upon request.

Gladly. However, we do require all planning specifications for the tasks concerned. Simply contact us. All details can then be discussed between you and our technicians personally.

In case of products which are not saved in the SCHAKO CAD library as DXF or DWG data sets, we are able to provide the appropriate CAD data in individual cases upon request.

Unfortunately there will always be individual products or variants which are not (yet) illustrated in the SCHAKO design programme. Usually these products are included in a later software update. Until then, we refer you to technical documentation which you can download from the SCHAKO website at Product as PDF.

Yes. SCHAKO can supply individual customised sizes (at extra cost) as long as the the smallest or largest serial sizes are not greatly exceeded. However, we would need to make a technical check for your concrete application and would therefore ask you to discuss details of feasibility with one of our technicians.

Increasing the installation height of the step swirl diffuser SIS significantly increase the risk of draught. From SCHAKO's point of view, optimal air distribution is only ensured up to an installation height of 126 mm. Only then will the comfort zone really remain draught-free (at 100m³/h/m at a distance of 500mm to the air outlet).

In principle yes, but this depends on the application. It is essential to take the correct connection to canal systems or air pipes into account during planning.

The SCHAKO fan coil units are extremely flexible in terms of use. They can be installed both on walls and in ceilings and can also be supplied in a cabinet version.

No problem. The fan coil units of CULTRA series can also be inspected from the rear without problems, depending on requirements.

Yes, the EasyBus touch screen not only serves to display the plant configuration, it is also of clear design. Status reports of the system can be recognised immediately without requiring further aids. Interfaces also allow linking to other display options, for example, notebooks, iPads or similar equipment. SCHAKO recommends its customers to use an integrated touch screen as the status of the system can then be captured without further aids.

All SCHAKO fire dampers have been manufactured entirely without asbestos-containing materials since 01. August 1988. Special customer information dealing comprehensively with this topic is available at SCHAKO for handling or replacing old asbestos-containing fire dampers. To download this information as PDF document, please click here.