Viessmann VITODENS 111-W Installation And Service Instructions Manual page 27

Further details regarding the individual steps
r r
Commissioning, inspection, maintenance
(cont.)
03. Turn rotary selector "tr" fully
clockwise, until the display shows
"SERV".
Within 2 s return the rotary selector
to the r.h. control range. The display
shows "A".
04. Set to upper heating output:
Turn rotary selector "tr" fully
clockwise, until the display shows 5
bars for the higher heating output.
05. Check the CO
2
heating output.
The CO content must be between
2
7.0 and 10.5 %.
06. Set to lower heating output:
Turn rotary selector "tr" fully anti-
clockwise, until the display shows 1
bar for the lower heating output.
07. Check the CO
2
heating output.
The CO content must be between
2
approx. 0.3 and 0.9 % below the
value for the upper heating output.
content for the upper
content for lower
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