Ventilating The Solar Thermal System - Viessmann Vitosol 200-T Service Instructions For Contractors

Commissioning, inspection, maintenance
Further details regarding the individual steps

Ventilating the solar thermal system

1. Open the air vent valve.
Vent the circulation pumps. For this,
adjust the circulation pumps to their
maximum speed, switching the pump
ON and OFF several times (a
ventilated pump runs almost silently)
through a relay test (manual
operation).
Repeat the ventilation process until
the float in the flow meter of the
Solar-Divicon holds a constant
position when the pump is running
(highest pump rate).
Note
Air can be recognised in the flow rate
indicator (float moves).
2. Set required flow rate above output
rate of the circulation pump (see
following tables for approximate set
values).
Read the value on the underside of
the float.
Adjustable flow rates
The details in the following table do not take the pipe pressure drop into account.
8
(cont.)
3. Repeat the ventilation process after
the system has been operational for
several days.
Note
If the system pressure drops, top-up
the heat transfer medium in the cold
state and ventilate again.
4. Always shut off the air vent valve after
ventilation.