Viessmann Vitosol 200-T Service Instructions Manual page 10

Commissioning, inspection, maintenance
Further details regarding the individual steps
03. Connect hoses from flushing and
filling facility N to drain valve G
and fill valve K.
04. Fill the container of flushing and fill-
ing facility N with heat transfer
medium.
05. Open drain valve G and fill
valve K.
06. Start the fill pump of flushing and fill-
ing facility N.
10
(cont.)
07. Observe the fluid level in the con-
tainer and top up with heat transfer
medium if necessary to prevent any
air entering the solar circuit. Let the
fill pump of flushing and filling
facility N run until no more air bub-
bles 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 proc-
ess: Use a screwdriver to turn the
slot on the adjusting screw above
the flow indicator to the vertical posi-
tion. Any air that remains in the
return is eliminated.
08. Close drain valve G. Let the fill
pump of flushing and filling
facility N 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 air
separator E.
09. Close fill valve K; stop the fill pump
of flushing and filling facility N.
Pressure must not drop for at least
30 minutes.
10. Open shut-off valve F: Use a
screwdriver to turn the slot on the
adjusting screw above the flow indi-
cator to the vertical position.