9
H
Flow indicator
K
Fill valve
L
Stagnation heat sink
M
Expansion vessel
N
Flushing and filling facility
O
Shut-off valve (return)
0
1.
Open shut-off valve (flow)
B
: Turn the ball valve
(thermometer) clockwise through 45°.
0
2.
Close shut-off valve (return)
O
: Turn the ball
valve (thermometer) clockwise through 90°.
0
3.
Close shut-off valve
F
: Using a screwdriver, turn
the slot on the adjusting screw to position "S".
Fig.3
0
4.
Connect hoses of flushing and filling facility
N
to
drain valve
G
and fill valve
K
.
0
5.
Fill the container of flushing and filling facility
N
with heat transfer medium.
0
6.
Open drain valve
G
and fill valve
K
.
0
7.
Start the fill pump of flushing and filling facility
N
.
0
8.
Observe the fluid level in the container and top up
with heat transfer medium if necessary to prevent
any air entering the solar circuit. Leave the fill
pump of flushing and filling facility
N
running until
no more air bubbles rise to the top of the container
(at least 20 to 30 min).
Note
Briefly open shut-off valve
F
towards the end of
the flushing process: Using a screwdriver, turn the
slot on the adjusting screw above the flow indica-
tor to the vertical position. Any air that remains in
the return is eliminated.
0
9.
Close drain valve
G
. Leave the fill pump of flush-
ing and filling facility
N
running until the required
charge pressure is reached.
Notes on residual ventilation
Even after thorough ventilation, some dissolved air
will still remain in the heat transfer medium. This
will be released as the temperature rises, and will
be discharged via air separator
E
.
10.
Close fill valve
K
; stop the fill pump of flushing
and filling facility
N
.
The pressure must not drop for at least 30
minutes.
11.
Open shut-off valve
F
: Using a screwdriver, turn
the slot on the adjusting screw above the flow indi-
cator to the vertical position.
12.
Turn shut-off valves
B
and
O
to their operating
positions (0°).
13.
Set the circulation pump to manual mode.
Open the air vent valve on air separator
E
.
Leave the circulation pump running
until the float
in the flow indicator
holds a constant position
while the pump is running.
Note
If there is air in the system, the float will oscillate.
Determining the flow rate and adjusting if required
Check the flow rate at the top edge of the float.
Commissioning, inspection, maintenance
Filling and flushing the solar thermal system…
(cont.)
5675 801 GB
