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Solar Pool Heating System -- Installation & User Manual
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Page 36
19.3
Notes on Teeing into the Suction Line for Configuration 2
If the tee can’t be installed more than 1m below the waterline, or if it can only be installed above the waterline,
some installers will put in a perfectly sealing non-return on the solar line to stop the main filter pump de-priming.
Please be aware, this is a special valve with a polished ball and rubber seat, contact us at
you require it. A standard flap non-return will not suffice. Also note, such a system will need regular careful
maintenance of the solar and filter line non-returns. Any failures or even the smallest leaks in these non-returns, due
to twigs or grit getting into the rubber seal, will pass air and eventually de-prime pumps.
Filter pump must be set on a timer to run outside of solar hours to exclude the possibility
of the two pumps running together.
Note: the tee into the suction line must be performed far below the waterline (> 1m).
Why?
When the filter pump starts it will create negative pressure in the suction line which
will drop the water line in the solar suction line - if the water line drops below the tee point
air will be drawn de-priming the main filter pump.