Viessmann VITOCROSSAL CRU 800 kW Service Instructions Manual page 17

Checking the CO
3. Hold down S and simultaneously for longer than
2 s.
The display will then show the following:
■ Status: "P" (= controlled stop)
■ Service: Modulation level in %. Here
"100" = 100 % = upper heating output.
"0" = 0 % = lower heating output.
Permissible CO content
2
Gas type
Natural gas E
Wobbe index Ws 13.5 kWh/m
≥
(0 °C; 1013.25 mbar)
Natural gas E
Wobbe index Ws < 13.5 kWh/m
(0 °C; 1013.25 mbar)
LPG P
CO test at the upper heating output
2
A
Fig. 9
1. Press until the service display has counted up to
"100" (= 100 %).
content
(cont.)
2
Heating output
Upper heating output (100 %)
3
Lower heating output (0 %)
Upper heating output (100 %)
3
Lower heating output (0 %)
Upper heating output (100 %)
Lower heating output (0 %)
Commissioning, inspection, maintenance
CO
2
9.2
8.2
9.0
8.0
10.9
10.0
2. Check the CO content at the flue pipe.
2
For permissible CO content, see above table.
2
content, dry
0.1 %
±
0.1 %
±
0.1 %
±
0.1 %
±
0.1 %
±
0.1 %
±
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