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

Commissioning, inspection, maintenance
Further details regarding the individual steps
5. Observe the fluid level in con-
tainer D and top up with heat trans-
fer medium if necessary to prevent
any air entering the solar circuit. Let
fill pump F run until no more air bub-
bles rise to the top of the container.
6. Close drain valve B. Let fill
pump F run 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 the air sep-
arator.
7. Close fill valve C; switch OFF fill
pump F.
Pressure must not drop for at least 30
minutes.

Determining and adjusting the flow rate if required

Check the value at the bottom edge of
the flow indicator float.
In conjunction with multi stage circulation
pumps, set the required flow rate via the
output stage (see the following table for
approximate set values).
Flow rates to be set
The details in the following table do not
take the pipe pressure drop into
account.
10
(cont.)
8. Open shut-off valve A.
9. Vent the circulation pumps. Select
manual mode.
Repeat the ventilation process until
the float in the flow indicator holds
a constant position when the pump is
running.
l/min
12
10
8
6
4
2
Note
If there is air in the system, the float
will cycle.