Brugsvejledning Directions for use Bedienungsanweisung ... - Velux

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Brugsvejledning Directions for use Bedienungsanweisung ... - Velux

Tips for fault localizationStores are cooled during the night.The solar circuit pump does not work although thecollector is obviously warmer than the store.Does collector circuitpump run during the night?nononoyesCollector temperature isat night higher thanambient temperature.yesWarm water outflowupwards?yesCheck the controllerfunctionsCheck the return flow preventerin feed flow andreturn flow with regard tothe functional efficiency.Change connection andlet the water flowsidewards or through asiphon (bow downwards);less store lossesnow?noyesDoes the pump start upin manual operation?noyesIs the current of thepump released bythe controller?noyesThe adjusted temperaturedifference forstarting the pump istoo high; choose a valuewhich makes more sense.Is the pump stuck?yesStart the pump shaftup by a screwdriver;is it ready for operationnow?noDoes warm watercirculation run for avery long time?noyesyesSwitch-off thecirculation pump andthe blocking valvesfor 1 night; less storelosses?noo.k.Use the circulation pumpwith timer andswitch-off thermostat(energy efficientcirculation)Make sure that the pumpsof the after-heatingcircuit are not in nightlyuse and that the returnflow inhibitor is faultless;problem solved?Are the fuses of thecontroller o.k.?noyesReplace the fuses.Is the pump defective− replace it.Controller seems to bedefective − replace it.noControl the return flowpreventer in warmwater circulation - o.k.yesnoPlease also checkfurther pumps whichare connected to thesolar store.Clean or replace.The gravitation circulation in the circulation line is toostrong; insert a stronger return flow preventer or anelectrical 2-way valve behind the circulation pump;the 2-way valve is open in pump operation, otherwiseit is closed, connect pump and 2-way valve in parallel;activate the circulation again!60 VELUX

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