7 Filling and purging the system
20
Installation and maintenance instructions flexoTHERM exclusive 0020213395_00
Approved environment
source
Ground/groundwater
module
Cloud point* of the aqueous
ethylene glycol mixture
-16 °C
Cold protection** of the aqueous
ethylene glycol mixture
-18 °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 and
groundwater heat sources:
–
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)
.
Caution.
Risk of material damage caused by an
incorrect filling direction.
If you fill the brine pump against the direction
of flow, this may lead to a turbine effect which
can damage the pump's electronics.
▶
Ensure that the brine pump is filled in the
direction of flow.
7.
Use the filling pump
(67)
to pour the brine fluid from the
brine container
(66)
into the brine circuit.
7.2.3
Purging the brine circuit
1.
Start up the filling pump
(67)
in order to fill and rinse the
brine circuit.
2.
Allow the filling pump
(67)
to run for at least 10 minutes
in order to fill and rinse the circuit sufficiently.
3.
Then close the stop valves
(61)
and
(62)
and switch off
the filling pump
(67)
.
4.
If required, repeat this rinsing process.
5.
Open the stop valve
(63)
.
7.2.4
Building up pressure in the brine circuit
1.
Use the filling pump
(67)
to pressurise the brine circuit.
Note
To operate the brine circuit without any prob-
lems, a filling pressure of 0.17 MPa (1.7 bar)
is required. The expansion relief valve opens
at 0.3 MPa (3 bar).
2.
Read off the pressure on a pressure gauge (on-site).
–
Brine fluid operating pressure range: 0.07
… 0.20 MPa (0.70 … 2.00 bar)
3.
Build up the pressure in the brine circuit by opening the
stop valve
(62)
and using the filling pump to top up the
brine fluid.
4.
If required, reduce the pressure in the brine circuit by
opening the stop valve
(61)
to drain brine fluid.
5.
Check the brine circuit's filling pressure in the heat
pump's display.
6.
If required, repeat the process.
7.
Remove the two hoses from the valves
(61)
and
(62)
.
8.
Purge the system once more after starting up the heat
pump.
9.
Label the container that holds the remaining brine fluid
with information about the type of brine fluid and the set
concentration.
10. Pass the vessel with the remaining brine fluid on to
the operator to be stored. Point out to the operator that
there is a risk of injury when handling brine fluid.
