Vent The Solar Heating System - Viessmann Vitosol 100-FM SV1F Installation, Operating And Service Instructions

Vitosol 100-FM/200-FM Installation, Operating and Service

Vent the Solar Heating System

1. The flow check valves on the Solar Divicon can be
bypassed by turning the combination thermometer/
isolation valve 45°. Leave them in this position while
starting up system. Open the air vent valve at the top
of the system and bleed air from the air separator in
the Solar Divicon.
2. Adjust the circulation pump to its highest speed
setting, and vent by starting and stopping several
times (a vented pump will operate almost silently).
Note: 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 separator.
3. Repeat the venting step until the float in the flow
meter of Solar Divicon holds a steady position when
the pump is running (highest speed setting).
Note: If air is present bubbles will be visible in the
flow meter (float moves).
4. Adjust the flow rate via the speed selector switch
of the circulation pump. See page 42 for suggested
flow settings for different collector arrays.
5. Repeat the venting steps after the system has been
operating a few days.
IMPORTANT
Top up with heat transfer medium and repeat the
venting process with the system in its cold state,
if the system fluid pressure has dropped after venting.
6. Close the air vent valve at the top of the collectors
after system venting is complete.
7. Periodically bleed air from manual air separator on
the Solar Divicon until no air is remains.
CAUTION
Failure to close air vent at top of system can lead to
steam escaping from air vent.
Start-up
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