Viessmann Vitoladens 300-W Installation And Service Instructions For Contractors page 26

Commissioning, inspection, maintenance
Venting the heating system
1. Switch ON the control unit.
2. Activate the venting program (see following steps).
Note
For function and sequence of the venting program,
see page 98.
3. Check the system pressure.
Activating the venting program
1. Press OK and simultaneously for approx. 4 s.
å
Filling the trap with water
!
Please note
During commissioning, flue gas may escape
from the trap.
Fill the trap with water before commissioning.
A B C
Fig. 19
Naming the heating circuits
In the delivered condition, heating circuits are designa-
ted "Heating circuit 1", "Heating circuit 2" and "Heating
circuit 3" (if installed).
If the system user prefers, heating circuits can be
renamed to suit the specific system.
26
2. "Service functions"
3. "Venting"
4. Terminate the venting program:
Press OK or .
ä
1. Remove retaining clip
If required, push insert
2. Fill trap with water.
B
3. Mount trap
B and secure with retaining clip
Note
Never twist the inlet hose during assembly. Route
the drain hose without any bends and with a con-
stant fall.
To enter names for heating circuits:
Operating instructions
and trap .
A B
upwards.
C
A .