Boiler Operation; Heat-Up Preparations; Action In Case Of Overheating - Viessmann VITOLIGNO 300-H Operating Instructions For The System User

Heat-up preparations

Action in case of overheating

The high limit safety cut-out protects
your boiler from overheating.
1. Check the heating system pressure
at pressure gauge A:
The system pressure is too low if the
indicator points to the area below the
red field. Top up with water or notify
your local heating contractor.
Minimum system pressure: 1.0 bar
(0.1 MPa)
2. Check that the vents of the installa-
tion room are unrestricted.
Note
With open flue operation, the com-
bustion air is drawn from the installa-
tion room.
3. Verify that the heating system or the
heating water buffer cylinder is draw-
ing off heat. Open the thermostatic
valves on the radiators if necessary.
4. Ensure that all heating flow and heat-
ing return shut-off gate valves are
open.
5. Check that all covers on the boiler are
closed.
6. Ensure that power is supplied to the
boiler.
Note
Modifications to these components, of
any kind whatsoever, are prohibited and
will render all warranties void.
Replace faulty components only with
genuine spare parts from Viessmann.

Boiler operation

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