Operating instructions

22
Checking the CO
2
or O
2
content
Vitodens 100-W is factory-set for natural
gas. During commissioning or mainta-
nance, the CO
2
and CO have to be
measured at the boiler flue adaptor test-
point to check the flue integrity. Subject
to the Wobbe index, the CO
2
content
fluctuates between 7.4 % and 10.5 %.
And CO of up to 500 ppm is accepta-
ble.
We recommend to measure O
2
as the
value is unmistakable regarding lambda
(air/gas). The O
2
-content fluctuates
between 7.5 % and 3.2 %. The CO/CO
2
ratio has to be less than 0,008.
If the actual CO
2
or O
2
and CO values
deviate from the stated range, check the
balanced flue systems for leaks. If flue
installation is OK, change the gas
valve.
A
1. Connect a flue gas analyser at flue
gas port
A
on the boiler flue con-
nection.
2. Start the boiler.
rr
3. Turn rotary selector "tr" clockwise
for less than 2 s and then anticlock-
wise back to the control range on the
right.
The display shows "SERV" and the
boiler water temperature is shown.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5366 836 GB