Apricus Solar Water Heating System Installation and Operation ...

Apricus Solar Collector Installation & Operation Manual - USAthe storage tanks/heat exchanger (closed loop). In such regions, it is advisable to install a water softeningor anti-scale device to ensure the long term efficient operation of the solar water heating system.! Failure to install and maintain a water softening device in an area with “hard” water may void warranties.c) Any heat transfer fluid MUST be GRAS (Generally Recognized As Safe by the FDA) or a dual wall heatexchanger with leak detection must be used. Such liquids should be checked on a periodic basis, ideallyonce annually, but no less than once every 3 years, or as determined appropriate given experience in thatclimate and as may be specified by the manufacturer. Refer to 3.31 for more information on heat transferfluids. As a general rule the following tests should be completed (see also sections 11.5 & 11.9).i) Check for cloudiness or “sludging” that would indicate indicate fluid breakdownii) Check pH. It should be within the range specified by the manufactureriii) Use a hydrometer to check freeze protection level! Performance losses due to scale formation is not eligible for warranty claims.! Performance losses or any component failure related to fluid degradation are not eligible for warranty claims.3.21. Metallic Corrosiona) Chloride: Copper is susceptible to corrosion, especially if high concentrations of chloride are present.The solar collector may be used for heating of spa or pool water, but levels of free chlorine must not exceed5 ppm, otherwise the copper header may corrode.b) Copper Corrosion: On rare occasions, corrosion of copper pipe may occur causing blue staining at thepoint of hot water usage. This corrosion is generally due to either poor water quality or electrical current onthe copper pipe due to poor grounding or contact with some electrical appliance or electrical source causinggalvanic reactions.c) Air Pollutants: Air pollutants such as acid rain, emissions from industrial exhausts and variouschemicals in the air may cause corrosion of the collector casing and frame. A site inspection should becompleted to identify any potential pollutants prior to installing system.d) Coastal Regions: The 439, 301 and 304 grade stainless steels used for Apricus solar collector frames,clips and fasteners are corrosion resistant to salt water.Installation near the sea is not normally a problem.In some coastal regions, the combination of salt spray and living sea microbes can result in rapid corrosionof the stainless steel. In such cases, the frame needs to cleaned thoroughly and sprayed with an enamelpaint to provide protection (zinc based paint is NOT suitable).e) Refer also to water quality requirements above in section 3.20.! Corrosion related damage is not eligible for warranty claims.3.22. Freeze protectionFreeze protection must be implemented in any regions that experiences freezing conditions at any timethroughout the year.a) For areas with temperature not falling below 23° F (–5°C), simple low temp controller based freezeprotection may be used. (i.e. pump circulates if the manifold temperature approaches freezing). If possible,backup protection in the form of uninterrupted power supply (UPS) or a power outage drain valve shouldalso be installed. Note: Power outage drain valve in installed on the return line (back from collector to tank)and opens to allow water to slowly run through the collector if power supply is cut. A check valve betweenthe tank and drain valve must be installed, to ensure flow is through the collector. The Apricus direct flowpump station uses this kind of valve. See section 8 for detailsb) For areas with temperatures below 23° F (–5°C), a closed loop filled with a freeze resistant heat transferfluid should be used. Please refer to heat transfer manufacturer’s specifications about the temperatureranges the fluid can withstand. The pH and freeze level of the fluid should be tested every year before coldweather occurs. Always follow the manufacturers guidelines when testing the pH and freeze protection ofthe heat transfer fluid. Refer to sections 11.5,11.9, 3.31 & Appendices 11-18 for more information.c) Evacuated tubes are not susceptible to damage in cold weather, and Apricus heat pipes are protectedagainst damage that could result from the freezing of the water inside.Copyright 2011 – Apricus Inc Doc: A7-05.4.1.4-PB-1.9 Page 34 of 126