Viessmann VITODENS 300 Service Instructions Manual page 91

Repairs
(cont.)
Checking the Vitotronic 050 (accessories)
The Vitotronic 050 is connected to the control unit via the LON system. To test
the connection, implement a user check at the boiler control unit (see page 32).
Changing the combustion control parameters
The parameters are changed via the coding addresses in code 2.
Calling up coding addresses
1. Press L and G simultaneously
for approx. 2 s; confirm with d.
2. Select the required coding address
"11" with a or b; the address
flashes; confirm with d; the value
flashes.
3. Adjust value "9" with a or b;
confirm with d. The green ON
light flashes.
The access to the coding
addresses of the parameters is
open.
Coding
Coding in the delivered condition
Burner
7d:0 Air factor correction 0
4. Select the required coding address
with a or b (see the following
table) and change the value.
5. Select "11 9" to increase the value
of the coding address; then press
L and G simultaneously for
approx. 1 s.
Encoding has been terminated.
Note
If setting the parameters is not con-
cluded via coding address 11, the
system automatically terminates
the parameter change after approx.
25 min.
Possible change
7d: 5 Note
to A change is only possible
7d:10 if manual calibration was
first carried out via cod-
ing address 85.
Air factor correction ad-
justable from
Each step represents an
air factor modification of
approx. 0.01.
Troubleshooting
5 to 10.
91