Vaillant geoTHERM VWS Installation Instructions Manual

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Vaillant geoTHERM VWS Installation Instructions Manual Manual pdf 22 page image

Installation instructions geoTHERM VWS/VWW 0020051574_01225.2 Filling the brine circuit (VWS only)The brine fluid consists of water mixed with a heattransfer fluid concentrate. As an additive we recom-mend propylene glycol (alternative: ethylene glycol)with corrosion-inhibiting additives. A DN 40 collectorhose has a capacity of approx. 1 litre per continuousmetre.The brine fluids that may be used differ greatly from re-gion to region. Please find out about this from the au-thorities responsible.Vaillant only approves of operating the heat pump withthe following brine media:- max. 30 % ethylene glycol/water- max. 33 % propylene glycol/water- potassium carbonate/water- max. 60 % ethanol/waterWQ6664 586259602957616765Fig. 5.1 Brine circuitKey to Fig. 5.129 Brine pump57 Stop valve58 Bleed valve59 Brine expansion tank60 Expansion relief valve61 Stop valve62 Stop valve64 Stop valve65 Brine collecting tank66 Brine reservoir67 Filling pumpWQ Heat source circuita Caution!Environmental hazard!Leakage of brine media must not resultin any contamination of the groundwater or the soil. Substances must beselected that are non-toxic and biologi-cally degradable.h Caution!Danger of leakage when using calciumcarbonate as brine fluid!The use of calcium carbonate/water asbrine fluid is not permitted if passivecooling has been installed by the cus-tomer as it may react with the sealingplastics in the mixer valve.To fill the brine circuit, proceed as follows:• Mix the antifreeze used by Vaillant in Germany, Aus-tria and Switzerland, 1.2 % propylene glycol, withwater in the proportion 1 : 2.This offers frost protection down to -15 °C.• Mix water and antifreeze to the specified concentra-tion in an external vessel (e.g. plastic canister, Pos. 66).Every batch of the mixture must be carefully blended.• Check the mixing proportions of the brine fluid.Vaillant recommends the use of a refractometer forthis purpose.• Then fill the brine mixture from the container (66)into the heat source system. This will require a fillingpump (67) that simultaneously bleeds the collectorcircuit as it fills it. Vaillant recommends the Vaillantfilling pump (Art. No. 307093). Connect the pressureline on the pump to stop valve (62).• Close stop valve (57).• Open stop valves (62) and (64).• Open stop valve (61) and connect a hose to it, with theother end of the hose draining into the glycol mixture.• Start the filling pump (67) in order to fill the collectorhose.5 Filling the heating and heat source systems