Viessmann Vitopend 100-W Installation And Service Instructions Manual page 36

Commissioning, inspection, maintenance
Further details regarding the individual steps
5.
A
C
A
A "Air vent key" supplied
Also for the shut-off valves
(accessories) and for removing
the flow switch
B Circulation pump drain screw
C Fill valve
Fill the heating system:
■ Conventional gas boiler:
Via fill valve in connection set (if
supplied) or via on-site fill valve.
■ Gas combi boiler:
Via fill valve in connection set (if
supplied) or via fill valve C on the
underside of the boiler.
Minimum system pressure
> 0.08 MPa.
Enter the measured value in the
enclosed "Guarantee card".
36
!
6. Please note
If the system pressure falls
below 0.08 MPa, the circula-
tion pump will suffer dam-
age.
In the event of a pressure
drop immediately top up the
water.
Ensure a minimum system
pressure of > 0.08 MPa
during the filling and venting
process.
B
7. For activating the filling and venting
function, see next chapter.
8. After the system has been fully
charged and vented, turn OFF the
ON/OFF switch at the control unit.
The function will also terminate
automatically after 30 min.
9. Close the fill valve.
(cont.)