23
Installation instructions geoTHERM VWS/VWW 0020057444_01
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. 6.1, Item.
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. 307 093). 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.
• 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 es-
cape.
• 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
started (see Chap. 7.4).
Check the filling level of the brine fluid
a
Caution!
Risk of damage!
The filling level is correct when the brine
expansion tank is 2/3 full. The installa-
tion can be damaged if the filling level is
too high.
• Top up the brine fluid when the filling level has fallen
so low that it is no longer visible in the expansion
tank.
1
2
Fig. 5.2 Filling level of the brine expansion tank
Key to Fig. 5.2
1 Filling level too low
2 Filling level correct
The filling level of the brine fluid can fall a little in the
first month following commissioning of the system; this
is quite normal. The filling level can also vary depending
on the temperature of the heat source, but under no cir-
cumstances should it fall so far that it is no longer visi-
ble in the expansion tank.
5.3
Well system (VWW only)
When using water as the heat source, it is not necessary
to fill the heat source system as it is an open system.
Filling the heating and heat source systems 5
Summary of Contents for geoTHERM VWS Series
Page 1: ...For the heating engineer Installation instructions geoTHERM Heat pump VWS VWW GB ...
Page 90: ......
Page 91: ......
Page 92: ...0020057444_01 GB 072008 ...
