Vaillant geotherm exclusive Installation Instructions Manual page 29

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 container (e.g. plastic canister, see
Fig.5.3, 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 (product no. 307 093). Connect the pres-
sure 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.
• Allow the filling pump (67) to run until fluid free of air
emerges from the hose connected to stop valve (61).
geoTHERM exclusive VWS 0020051614_00 installation instructions
Filling the heating and heat source systems 5
For a better filling and ventilation of the hydraulic pipe
of the cooling function on the brine side, it is expedient
to push in the pin of the brine mixing valve manually
around 50 %. Thus, both channels are opened so that
existing air in the system can be discharged. At the
same time leave the filling pump to run.
To be able to push in the pin of the brine mixing
valve manually, do as follows:
Fig. 5.4 brine mixing valve with motor housing
• Remove the cable of the electric power supply (2) of
the brine mixing motor (1).
Fig. 5.5 detaching the motor housing of the brine mixing valve
• Detaching motor housing from the valve body of the
brine mixing valve (see fig. 5.5):
1. Push in the safety lever
2. Turn the motor housing around 45°
3. Detaching the motor housing
2
2.
45°
1.
1
3.
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