Installation instructions geoTHERM VWS/VWW 0020051574_01
22
5.2
Filling the brine circuit (VWS only)
The brine fluid consists of water mixed with a heat
transfer fluid concentrate. As an additive we recom-
mend propylene glycol (alternative: ethylene glycol)
with corrosion-inhibiting additives. A DN 40 collector
hose has a capacity of approx. 1 litre per continuous
metre.
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 with
the following brine media:
- max. 30 % ethylene glycol/water
- max. 33 % propylene glycol/water
- potassium carbonate/water
- max. 60 % ethanol/water
WQ
66
64
58
62
59
60
29
57
61
67
65
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
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.
h
Caution!
Danger of leakage when using calcium
carbonate as brine fluid!
The use of calcium carbonate/water as
brine fluid is not permitted if passive
cooling has been installed by the cus-
tomer as it may react with the sealing
plastics 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, with
water 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 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. 307093). Connect the pressure
line 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 the
other end of the hose draining into the glycol mixture.
• Start the filling pump (
67
) in order to fill the collector
hose.
5 Filling the heating and heat source systems
