Installation Instructions

34
Checking the CO
2
content
The Vitodens 100-W is factory-set for
natural gas. During commissioning or
maintenance, the CO
2
and CO have to
be measured at the boiler flue adaptor
test point to check the flue integrity. Sub-
ject to the Wobbe index, the CO
2
content
fluctuates between 7.4 % and 10.5 %.
CO of up to 500 ppm during ignition is
acceptable.
We recommend measuring the 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 0.004.
If the actual CO
2
or O
2
and CO values
deviate from the stated range, check the
balanced flue systems for leaks. If the
flue installation is in order, change the
gas valve.
Note
Operate the appliance with uncontami-
nated combustion air to prevent operat-
ing faults and damage.
A
01. Connect a flue gas analyser at flue
gas port
A
on the boiler flue con-
nection.
02. Start the boiler and check for
leaks.
Danger
Escaping gas leads to a risk
of explosion.
Check gas equipment for
tightness.
rr
03. Turn rotary selector "tr" fully
clockwise for less than 2 s and then
back into the r.h. control range.
The display shows "SERV", "
A
"
and the boiler water temperature is
displayed.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5609 059 GB