EcoOnline Perf
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Solar Pool Heating System -- Installation & User Manual
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16.13
Return Line Configuration for Low Pitch Roof
16.14
Preferred Bi-Directional Flow Configuration
Split collector arrays with a vertical height difference of greater than 1m MUST use the
above configuration with a constricting ball valve installed on the supply to the bottom
array to protect it from excessive pressure.
Why?
Without the constricting ball valve the bottom array would receive all the water
flow.