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Apricus Solar Water Heating System Installation and Operation ...

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<strong>Apricus</strong> <strong>Solar</strong> Collector <strong>Installation</strong> & <strong>Operation</strong> Manual - USAf) Recommended Delta-t Settings for Variable Speed:The length of the pipe run is not such an important consideration for variable speed pump systems. Duringgood sunny conditions the pump will run continually <strong>and</strong> the controller will modulate the flow rate to maintaina suitable delta-t level.Closed loop systems will require a slightly high dTMax <strong>and</strong> dTMin, because the heat exchanger requires ahigher delta-t to achieve good heat transfer. Setting the dTMin to less than 7°F (4°C) could result in thepump running continually because the potable side of the heat exchanger may only ever get within 8°F ofthe solar loop <strong>and</strong> will therefore never be able to close the to the 7°F dTMin setting.During poor solar conditions, if the pump is circulating continually, then the dTMin should be increasedslightly.During sunny weather, if the pump regularly turns off, the dTMin should be reduced slightly.i) Direct Flow <strong>System</strong>s: Suggested setting: dTMax = 14°F (8°C) dTMin = 4°F (2°C)iiv) Closed Loop <strong>System</strong>s: Suggested setting: dTMax = 20°F (12°C)dTMin = 5°F (4°C)Copyright 2011 – <strong>Apricus</strong> Inc Doc: A7-05.4.1.4-PB-1.9 Page 58 of 126

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