External surface-mounted aluminium micro louvre blade system for optimal shading
Ideal for use in offices and public buildings as well as private residential buildings: the Schüco CTB (Concealed Toughened Blind) sun shading system as a surface-mounted solution on Schüco AWS window systems. The sun shading is installed above the window in an insulated box, thereby fitting in perfectly with the look of the building. When raised completely, it is not visible due to its integration in the top box.
The electrically operated blind, made from aluminium micro louvre blades, permits optimal shading while the high level of transparency simultaneously provides the best possible views to the outside.
The louvre blades can be incorporated perfectly into the external design of the building envelope as their surfaces can be anodised, which creates a cohesive façade appearance.
The highly stable system can withstand extreme wind loads and even be used in tall buildings, practically regardless of wind loads – with maximum performance in terms of efficiency. The solar energy transmittance of the integrated sun shading is calculated depending on the angle of the sun: at an angle of 50° in summer, less than 2 percent of solar energy reaches the room. Rooms therefore heat up less and the energy costs for air conditioning are significantly reduced.
Schüco CTB solar shading surface-mounted on a window system
Schüco CTB solar shading is active, external shading that is surface-mounted on a window unit and offers exceptionally high wind stability. The solar shading is fitted in an installation frame, which is screwed to the window profile. The load is transferred via the ceiling. It provides optimum shading for interior rooms and high transparency for views to the outside.
Blind
The blind consists of horizontal, extruded aluminium louvre blades with fixing groove, which are attached to each other by stainless steel cables. The louvre blades are therefore fixed without visible interruption of the outward-facing side of the profile.
Complete shading must be provided from when the sun is at an angle of 20° with a degree of transparency of at least 23%. When the sun is at an angle of at least 20°, the gtotal value in conjunction with the thermal insulation glazing must be 0.07.
The wind stability of the blind from 30 m/s (11 Beaufort) must be proved by a wind tunnel test with test certificate.
If the solar shading is used in front of opening units which open outwards, it must be ensured that the opening units can only be opened when the solar shading is raised. When the blind is raised, the end strip is not visible.
The louvre blades are made from an extruded aluminium profile and measure 9.3 mm x 9.6 mm. They are positioned at an angle of 45° to the outside and have a convex curvature with a radius of 10 mm. The inward-facing louvre blade has a concave curvature (radius of 13 mm) and has a face height of 8 mm. The louvre blades are anodised to E6 in natural metallic C0 / light bronze C31 / pale bronze C32 / medium bronze C33 / dark bronze C34 / black C35.
The drive shaft must be configured as an extruded hollow profile. The 230 V electric motor is inserted in the shaft and secured against movement along the axes. The blind is connected to the shaft by means of positive and friction-locked, hook-in couplings. The shaft is prepared with sliding and fixed bearings.
Blind operation
The blind is guided by extruded aluminium profiles at the side. The profiles are attached to the window using a clip-on profile, which is screwed onto the outer frame of the window. Two plastic rubbing strips must be integrated in every guide groove. The louvre blades and the guide cap of the end strip run quietly in the guide tracks.
Entry guides
The top attachment of the guide tracks must be designed with plastic entry guides.
Guide rollers
Plastic deflection rollers must be provided, and these must ensure that the blind runs securely in the guide tracks. Guide plates on the side of the outer rollers ensure that the blind retracts correctly.
Shaft bearing
The shaft is inserted in the bearing brackets from the outside, which must be electro-coated. The bearing brackets are mounted on the brackets in the installation frame and must allow for the vertical alignment of the shaft. The shaft is secured in the bearing plates at the front via a locking bar that must be screwed in two places.
Actuator
The drive has a 230 V / 50 Hz tubular motor that is inserted in the shaft and that has a connecting cable (0.25 m long, 4-core, 8 mm diameter) and fitted plug connection. The top and bottom end position can be set electronically using an adjustment cable. The drive has VDE and CE marks and EMV radio suppression seal.
Installation frame
The installation frame consists of aluminium brackets at the side, rectangular connecting profiles (dimensions: 50.0 mm x 41.0 mm), T-cleats for fixing the connecting profiles to the side brackets, spacer tubes (external diameter: 40 mm) for load transfer via the ceiling, brush profiles with inserted brush seal, an insulating profile for fixing the installation frame to the window profile and side / continuous thermal insulation (side nominal thickness: 20 mm, continuous nominal thickness: 80 mm). The installation frame is surface-mounted on the window and screwed to the window profiles through the insulating profile. The load is transferred via the ceiling by the spacer tubes.
Operation
The blind profiles are raised and lowered using standard flush or surface-mounted switches and host control system (central control, sun monitor, ice monitor, wind monitor, time switch). The end switch integrated in the drive switches the motor off when it reaches the top and the bottom end position.
Colours and surface finishes
The shaft must be plate finish, the louvre blades and the end strip must be anodised and the guide tracks must be anodised / powder coated.
For the louvre blade colours C0 and C31, the plastic clips of the fixing cable must be grey. For the colours C32, C33, C34 and C35, the plastic clips must be black. All other plastic parts must be black.
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