Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 87

Checking the combustion quality
Fig. 79
1. Connect a flue gas analyser at flue gas port
the boiler flue connection.
2. Open the gas shut-off valve, start the boiler and
create a heat demand.
3. Adjust the lower heating output.
4. Check the CO or O content. Should the actual
2 2
value deviate from the aforementioned ranges by
more than 1 %, implement the measures listed
above.
5. Enter the actual value into the report.
6. Adjust the upper heating output.
7. Check the CO or O content. Should the actual
2 2
value deviate from the aforementioned ranges by
more than 1 %, implement the measures listed
above.
8. Enter the actual value into the report.
Selecting the upper/lower heating output
Note
Ensure adequate heat transfer.
Tap the following buttons:
01. " "
Commissioning, inspection, maintenance
(cont.)
A
on 02. "Service"
A
03. Enter password "viservice".
04. Use to confirm.
05. "Actuator and sensor test"
06. Use " " to confirm.
07. Set the lower heating output:
Set "Burner modulation, set value" to the mini-
mum value (> 0).
08. Use " " to confirm.
The burner now operates at the lower heating out-
put.
09. Set the upper heating output:
Set "Burner modulation, set value" to 100 %.
10. Use " " to confirm.
The burner now operates at the upper heating out-
put.
11. End output selection:
or
87