15
Ask your contractor about the following:
■
Necessary commissioning steps
■
Required system pressure level (minimum system
pressure)
■
Position of the following components:
–
Pressure gauge
–
Vents
■
Water quality requirements
Fig. 8
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 in the installation room are
unrestricted.
Note
With open flue operation, the combustion air is
drawn from the installation room.
3.
Verify that the heating system or the heating water
buffer cylinder is drawing off heat. Open the ther-
mostatic valves on the radiators if necessary.
4.
Ensure that all heating flow and heating return
shut-off gate valves are open.
5.
Check that all covers on the boiler are closed.
6.
Switch ON the power supply, e.g. at a separate
MCB/fuse or a mains isolator.
7.
Switch on the ON/OFF switch on the control unit.
The home screen is shown after a short time. Your
heating system and, if installed, remote controls
are ready for operation.
Note
If your heating system has been shut down for a
prolonged period, you may need to reset the
"Time"
and
"Date"
: See chapter "Setting the time
and date".
Switching the heating system on and off
To switch the heating system on and off, press
"
START/STOP
" on the boiler.
Steps to take in the event of overheating
The high limit safety cut-out and the thermally activa-
ted safety valve protect your boiler from overheating.
Note
Modifications to this component are prohibited and will
render all warranties void.
Replace faulty components only with genuine spare
parts from Viessmann.
Note
If the boiler overheats again after a short time or over-
heats regularly, notify your heating contractor.
Start-up/shutdown
Heat-up preparations
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