Viessmann Vitocal 300-G Installation And Service Instructions Manual page 109

Further details regarding the individual steps
Filling and venting the heating water side
A Fill & drain valve
1. Open any non-return valves
installed on site.
2. Check the pre-charge pressure of
the expansion vessel (see
page 109).
3. Thoroughly flush the on-site pipe-
work.
Commissioning, inspection, maintenance
(cont.)
4. Fill the heating circuit via fill &
drain valve A with water; during
filling, check the system pressure
at the pressure gauge.
Minimum system pres-
sure
Permissible operating
pressure
5. Close fill & drain valve A.
6. Open a suitable air vent valve in
the heating circuit.
!
7. Please note
To prevent equipment
damage, check the flow
and return connections of
the secondary heat pump
circuit for leaks.
In case of leaks, immedi-
ately shut off the equip-
ment, drain the water and
check the seating of the
seal rings. Replace all seal
rings that may have
slipped.
8. Switch ON the power.
9. Remove the cause if the phase
monitor has responded. The relay
does not need to be reset.
10. Set the operating mode selector
to "9".
See operating instructions
0.8 bar
3 bar
109