Checking The Combustion Quality - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Burner adjustment when connecting multiple...
Rated heating output 26 kW
Number of boilers
Correction factor (adjustable value)
0
1
2
3
4
5
6
Rated heating output 35 kW
Number of boilers
Correction factor (adjustable value)
0
1
2
3
4
5
6
Rated heating output 35 kW
Number of boilers
Correction factor (adjustable value)
0
1
2
3
4
5
6
Note
The correction factor changes the boiler modulation
range.

Checking the combustion quality

The Vitodens 111-W is factory-set for natural gas. Dur-
ing commissioning or maintenance, the CO
have to be measured at the boiler flue adaptor test port
to check the flue integrity. Subject to the Wobbe index,
the CO content fluctuates between 7.5 % and 10.5 %.
2
CO of up to 500 ppm during start-up is acceptable.
We recommend measuring the O
unmistakable regarding lambda (air/gas). The O
tent fluctuates between 7.5 % and 3.2 %. The CO/CO
ratio has to be less than 0.004.
30
operation with LPG
–
operation with natural gas
–
operation with LPG
–
and CO
2
, as this value is
2
con-
2
2
(cont.)
2
Flue length a (m)
25
≤
> 6
–
> 12
–
> 19
–
–
–
2
Flue length a (m)
17
≤
> 17 25 > 4
≤
> 10
–
> 15
–
> 21
–
–
2
Flue length a (m)
20
≤
> 20 25
≤
> 9
–
> 14
–
> 20
–
–
If the actual CO or O and CO values deviate from the
2 2
stated range, check the balanced flue system for
leaks. If the flue installation is OK, change the gas
valve.
Note
To prevent operating faults and damage, operate the
appliance with uncontaminated combustion air.
4
6
≤
12
≤
19 > 8
≤ ≤
25 > 10
≤ ≤
> 13
– ≤
> 16
– ≤
4
4
≤
10
≤
15 > 7
≤
21 > 8
≤ ≤
25 > 11
≤ ≤
> 15
– ≤
4
5
≤
> 5 9
≤
14 > 6
≤
20 > 8
≤ ≤
25 > 10
≤ ≤
> 13
– ≤
6
8
≤
10
13
16
20
6
7
≤
8
≤
11
15
17
6
6
≤
8
≤
10
13
15