Venting The Solar Thermal System - Viessmann Vitosol-F Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Venting 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 venti-
lated pump runs almost silently)
through a relay test (manual opera-
tion).
Repeat the ventilation process until
the float in the flow meter of the
Solar-Divicon holds a constant posi-
tion when the pump is running (high-
est pump rate).
Note
Air can be recognised in the flow rate
indicator (float moves).
2. Set the required flow rate via the
pump rate of the circulation pump
(see following tables for approximate
set values).
Check the value underneath the
float.
Adjustable flow rates
Vitosol 200-F, type 5DI
Throughput 3 to 4 l/min
Vitosol 200-F, 300-F
The details in the following tables do not take the pipe pressure drop into account.
8
(cont.)
3. Repeat the venting process after the
system has been operational for sev-
eral days.
Note
If the system pressure drops, top-up
the heat transfer medium in the cold
state and vent again.
4. Always shut off the air vent valve after
venting.