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

Further details regarding the individual steps
3. Use a high speed pump to flush the
system. Observe the fluid level in the
container and top up with heat trans-
fer medium if necessary to prevent
any air entering the solar circuit. Let
the fill pump run until no more air bub-
bles rise to the top of the container.
4. Close the drain tap on the fill valve
and let the fill pump run until the
required system pressure is reached
(including 0.1 bar pressure reserve
for residual ventilation during opera-
tion).
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 extracted via the air sep-
arator.

Determining the flow rate and adjusting if required

Read off the value at the bottom edge of
the float in the flow indicator of the Solar-
Divicon (see diagram on page 9).
In conjunction with multi stage circulation
pumps, set the required flow rate via the
output stage (see the following table for
approximate set values).
Adjustable flow rates
The details in the following tables do not take the pipe pressure drop into account.
Commissioning, inspection, maintenance
5. Close the fill tap on the fill valve; open
the fill pump.
Pressure must not drop for at least 30
minutes.
6. Vent the circulation pumps. Select
manual mode.
Repeat the ventilation process until
the float in the flow indicator of the
Solar-Divicon (see diagram on
page 9) holds a constant position
when the pump is running.
Note
Air can be recognised in the flow indi-
cator (float moves).
(cont.)
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