Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 112

Troubleshooting
Repairs
(cont.)
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 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
indicator flashes.
Access to the coding addresses of
the parameters is open.
Coding
Coding in the delivered condition
Burner
7d:0 Air factor correction 0
82:0 Operation with natural
gas
83:0 Correction, ignition start
gas volume 0%
112
4. Select the required coding address
with a or b (see the following
table) and change the value.
5. To exit, set the value of coding
address 11 9; then press L and
G simultaneously for approx. 1 s.
Coding 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.
82:1 Operation with LPG
83: 10 Correction, ignition gas
to volume adjustable from
83:+20 10 to +20%.
5 to 10.