Filling and purging the system 7
0020213394_01 flexoTHERM exclusive Installation and maintenance instructions
19
12. Then check the heating installation pressure again (if
required, repeat the filling procedure).
13. Remove the filling loop from the filling and drain valve
and screw the screw cap back on.
Moving the heating/cylinder charging diverter
valve into the starting position
45°
A
B
C
D
14. Remove the power supply cable from the motor head of
the diverter valve.
15. Push the locking lever.
16. Turn the motor head by 45°.
17. Remove the motor head.
Note
This moves the spring in the valve body back
into the starting position.
18. Turn the motor head back towards the valve body and
reconnect the power supply cable.
Note
The white switch lever on the motor head
of the diverter valve should now be in the
starting position.
7.2
Filling and purging the brine circuit
7.2.1
Mixing the brine fluid
The brine fluid consists of water mixed with a concentrated
frost protection agent. The brine fluids that may be used dif-
fer greatly from region to region. For more information, con-
tact the responsible authorities.
Only the brine fluids named here are authorised by Vaillant
for operating the heat pump.
Alternatively, suitable ready-mixed fluids for heat pumps can
be ordered from Vaillant.
▶
Use a sufficiently large mixing container.
▶
Carefully mix ethylene glycol with water.
Approved environment source
Ground/groundwater
module
Air/brine
collector
Brine content
30% vol.
44% vol.
Water content
70% vol.
56% vol.
Cloud point* of the
aqueous ethylene
glycol mixture
-16 °C
-30 °C
Cold protection** of
the aqueous ethyl-
ene glycol mixture
-18 °C
-33.5 °C
* Cloud point
** Cold protection
Above this temperature, the first ice
crystals start to form in the brine
fluid.
At this temperature, half of the fluid
volume has frozen; there is slush
ice.
▶
Check the mixture ratio of the brine fluid.
–
Working materials: Refractometer
In the event of special requirements, the following heat trans-
fer media are also authorised by Vaillant for the ground heat
source:
–
Aqueous solution with 33%
±
1% vol. propylene glycol
7.2.2
Filling the brine circuit
66
48
62
71
37
A
B
42a
63
61
33
67
65
33
Dirt filter
37
Automatic air separator
42a
Brine expansion relief
valve
48
Pressure gauge (op-
tional)
61
Stop valve
62
Stop valve
63
Stop valve
65
Brine collecting con-
tainer
66
Brine container
67
Filling pump
71
Brine diaphragm expan-
sion tank
A
From the heat source
to the heat pump (hot
brine)
B
From the heat pump to
the heat source (cold
brine)
1.
Install a dirt filter
(33)
in the pressure line.
2.
Connect the filling pump's pressure line to the stop
valve
(62)
.
3.
Close the stop valve
(63)
.
4.
Open the stop valve
(62)
.
5.
Connect a hose, which leads to the brine fluid, to the
stop valve
(61)
.
6.
Open the stop valve
(61)
.
