Vaillant geoTHERM VWS Installation Instructions Manual page 22

5 Filling the heating and heat source systems
a Caution!
Environmental hazard!
Leakage of brine media must not result
in any contamination of the ground
water or the soil. Substances must be
selected that are non-toxic and biologi-
cally degradable.
WQ
Fig. 5.1 Brine circuit
Key to Fig. 5.1
29 Brine pump
57 Stop valve
58 Bleed valve
59 Brine expansion tank
60 Expansion relief valve
61 Stop valve
62 Stop valve
64 Stop valve
65 Brine collecting tank
66 Brine reservoir
67 Filling pump
WQ Heat source circuit
• Mix the antifreeze used by Vaillant in Germany, Aust-
ria and Switzerland, 1.2 % propylene glycol, with water
in the proportion 1 : 2. This offers frost protection
down to -15 °C.
• Mix water and antifreeze to the specified concentrati-
on in a separate container (e.g. plastic canister, see
Fig. 5.1, Item 66). Every batch of the mixture must be
carefully blended.
• Check the mixing proportions of the brine fluid. Vail-
lant recommends the use of a refractometer for this
purpose.
• Then fill the brine mixture from the container (66)
into the heat source system. This will require a filling
pump (67) that simultaneously bleeds the collector
circuit as it fills it. Vaillant recommends the Vaillant
filling pump (Art.No. 307 093). Connect the pressure
line of the pump to the stop valve (62) (see Fig. 5.1).
• Close stop valve (57).
• Open stop valves (62) and (64).
22
67 62
61
57
58
64
66
60
59
65
• Open stop valve (61) and connect a hose to it, with the
other end of the hose draining into the glycol mixture.
• Start the filling pump (67) in order to fill the collector
hose.
• Allow the filling pump (67) to run until fluid free of air
emerges from the hose connected to stop valve (61).
• Now open valve (57) so that the air between valves
(61) and (62) can escape.
• Close valve (61) and pressurise the brine circuit using
the filling pump (67). Take care that the pressure
does not exceed 3 bar.
• Now close valve (62) as well.
• Switch off the filling pump (67) and remove the filling
hose.
• Open the expansion relief valve (60) to allow any pos-
sible overpressure to discharge. The brine expansion
tank must be 2/3 full of fluid. Make sure that valve
(61) is closed.
• Fill any remaining brine fluid into a suitable container
(e.g. plastic canister) for topping up later and hand it
over to the user for safekeeping.
Further bleeding is carried out after the cladding sec-
tions have been fitted and the heat pump has been star-
ted (see Chap. 7.4).
Installation instructions geoTHERM VWS 0020046310_01
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