Vaillant auroTHERM VFK 145/2 H Installation Manual page 9

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Fig. 4.4 Parallel interconnection (shown here: VFK 145/2V / 155V)
Installation manual auroTHERM 0020100606_02
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Interconnection scheme 4
Always connect the individual rows or the
complete collector array hydraulically in par-
allel one above the other.
> Connect as many flat collectors in series
as possible, but never more than 12.
> Only connect collector rows with the same
aperture area in parallel, to prevent differ-
ing pressure losses in the partial collector
arrays.
> Make sure that each partial collector array
has the same total pipe length in the flow
and return lines ( Tichelmann System), to
prevent differing pressure losses in the
connecting pipes.
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