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Solar Pool Heating System -- Installation & User Manual
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Page 32
19.5
Application of the PVC Coated Stainless Steel Straps
19.6
Three or More Row Roof Fixings
Due to the large potential thermal contraction across three rows the strapping of three
or more rows of panels between one set of fixed top and bottom aluminium angles is not
recommended.
Collector arrays consisting of three or more rows must have a pair of
aluminium L-angles top and bottom for each row of collectors or at least for each pair of
rows to allow for contraction.
IMPORTANT:
DO NOT
over tighten stainless
steel strapping.
Strapping must have sufficient
play to allow for collector contraction.
For the
installation of two rows between two
aluminium channels top and bottom strapping
should be loose enough to insert your
little
finger
between the strapping and the header
pipe.
Why?
Over-tightened straps can
experience tension and continual flexing of the
metal due to the thermal contraction of the
collectors. This can result in metal fatigue of
roof fixings over time.
