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Assembly instructions - Collector
Assembly instructions for bench screw mounting
The installation may only be carried out by qualified personnel. Only the supplied material should be used for
installation. For large collector arrays, it is often advantageous to mount the collectors on a special supporting
structure made of steel profiles. The substructure and its connections to the building should be designed by
structural engineers in accordance with the local conditions.
Attaching the collectors using concrete ballast blocks and guys allows the collectors to be mounted without
perforating the roof surface. The collectors are mounted on concrete blocks. Rubber mats should be used if
necessary to protect the roof surface from damage and to increase the friction between the roof and the ballast. The
collectors must also be secured with 5 mm steel cables (minimum tensile strength 1450 N/mm²) to absorb any peak
wind loads. The permissible roof loading and the fixing points on the building for the steel cables must be tested by
a structural engineer on-site.
Structure
The collectors may only be mounted on roof surfaces and substructures with sufficient load-bearing capacity. The
structural load-bearing capacity of the roof or substructure must be tested by local structural engineers before the
collectors are mounted. Here, particular attention should be paid to the quality of the (timber) substructure with
regard to the durability of screw connections for attaching the collector mounting devices. It is particularly important
to have the entire collector structure tested in accordance with DIN 1055, Part 4 and 5 by a local structural engineer
in regions with heavy snowfalls and strong winds. The assessment should also incorporate any special features of
the particular site that could lead to increased loads (foehn winds, air jets or eddy formations etc.).
Lightning protection
The metal tubes of the solar circuit must be connected to the main potential equalisation bus via a conductor (green/
yellow) with a cross-section of at least 16mm² CU (H07 V-U or R). If a lightning protection system exists, the
collectors can be connected to it. If not, the collectors can be earthed to an earth rod. The earthing conductor must
be routed outside the house. The earthing electrode must also be connected to the main potential equalisation bus
via a conductor with the same cross-section.
Connections
(screw connections)
Depending on the design, the connectors must be connected with one another and/or the connection pipes using
Whitworth threads and union nuts with flat-face seals. If flexible hoses are not to be used as connecting elements,
precautions must be taken to protect the connection pipes against temperature fluctuations caused by heat
expansion (expansion bends/flexible piping). In such cases, no more than 6 collectors may be connected in series.
Larger collector arrays must be assembled with expansion bends or flexible members inserted in the links
(IMPORTANT: check the pump design). Ensure that the flat gaskets are in the correct position. When tightening the
connections, always balance (counter) the torque with a pliers or another spanner to prevent damage to the
absorber.
Collector angle / general notes
The collector is suitable for angles between 15° (minimum) and 75° (maximum).
The ventilation holes in the collectors may not be closed when installing the system. All collector connections and
ventilation holes must be protected against contaminants such as dust, etc.
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