Determining The Flow Rate And Adjusting It If Required - Viessmann VITOSOL-F Service Instructions Manual

Commissioning, inspection, maintenance
Filling, flushing and checking the solar...
09. Close drain valve
G
ing and filling facility
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
10. Close fill valve ; stop the fill pump of flushing
K
and filling facility .
N
The pressure must not drop for at least 30
minutes.

Determining the flow rate and adjusting it if required

Check the flow rate at the top edge of the float.
If no flow rate is indicated, the non-return valve in the
return does not open automatically; the flow path is
blocked.
Open shut-off valve (return)
page 9): turn ball valve (thermometer) 45° clockwise.
This opens a bypass around the non-return valve. If a
flow rate is now indicated, the flow path is blocked.
Perform a test flush to cause the non-return valve to
open (see page 11).
l/min
35
30
25
20
15
10
5
Fig. 4
In conjunction with multi stage circulation pumps, set
the required flow rate via the output stage (see the fol-
lowing tables for approximate set values).
10
. Leave the fill pump of flush-
running until the required
N
.
E
(see diagram on
O
(cont.)
11. Open shut-off valve
F
the slot on the adjusting screw above the flow indi-
cator to the vertical position.
12. Turn shut-off valves
B
positions (0°).
13. Set the circulation pump to manual mode.
Open the air vent valve on air separator
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.
Note
With a Solar-Divicon, make the adjustment via shut-off
valve (adjusting screw above the flow rate indica-
F
tor).
Fig. 5
: Using a screwdriver, turn
and to their operating
O
.
E