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Start-up
Fill, Flush and Leak Test the Solar Heating System
CAUTION
All work on the solar circuit or the components of the
solar heating system may only be carried out if the sky
is very cloudy, early in the morning, in the evening or
with covered collectors.
We recommend the system is only flushed with the
specified heat transfer medium to prevent a mixing
with residual water inside the system. Mixing would
alter the level of frost protection.
Compact mobile charge station for flushing,
venting and filling solar collectors.
Solar-Divicon DN20B/DN25B pumping station
40
Vitosol 100-FM/200-FM Installation, Operating and Service
IMPORTANT
Heat transfer media containing glycol can be damaged
if they are subjected to temperatures above 338°F
(170°C) for a prolonged period of time (stagnation).
This can lead to the system suffering from sludge and
hard deposits, particularly in conjunction with other
contaminants and air.
Ensure that the system is correctly flushed, filled and
vented after installation. After filling the system with
heat transfer medium, ensure the system is correctly
vented and that heat is transferred inside the system,
i.e. that longer periods of stagnation are avoided.
The glycol PRV blow-off and drain pipe should
terminate in an open container capable of holding the
maximum possible collector fluid volume.
The Viessmann compact mobile charging station
is highly recommended for fast effective flushing,
filling and air removal.
1. Do not remove cover foil from flat plate collectors
before filling the system. Cover up collectors, if
necessary.
2. Manually open any installed isolation valves.
3. Open the flow check valves on the Solar Divicon
supply and return lines by:
Turning the combination thermometer/isolation valves
clockwise 45°.
4. Close the shut-off valve G on the system fill
manifold and open the drain valve H.
5. The system is flushed via the return line to the
collector. Fill and flush the system with heat transfer
medium via the filling valve F. Flush using a quick-
running pump until you can be sure that all debris
and air has been purged from the solar panel system.
Proper start-up can only be guaranteed with a system
that is completely free of air.
6. Close the drain valve H on the system fill manifold.
Continue to charge system until desired final fill
pressure is achieved (see page 36), then close F.
Open the shut-off valve G and check the system
for leaks. Manually operate the Solar-Divicon pump
at maximum speed for at least one hour to purge
any remaining air. Observe the permissible operating
pressure. The pressure should not drop over the
space of at least one hour. Please refer to the
Installation, Start-up and Service Instruction Manual
for the Solar-Divicon for additional information.
7. Set the pump speed as required to obtain the flow
rate shown in the chart on page 42.
8. For venting the solar heating system see page 41 for
additional information.
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