Viessmann VITODENS 333 Service Instructions Manual page 16

Initial start-up, inspection, maintenance
Further details regarding the individual steps
16
(cont.)
1. Connect a flue gas analyser at the
flue gas aperture A on the boiler
adaptor.
2. Open the gas shut-off valve, com-
mission the boiler and create a heat
demand.
3. Select the lower rated output.
Constant temperature control unit:
Press both keys 9 and d simul-
&
taneously until the display shows
1.
Weather-compensated control unit:
Press both keys 9 and d simul-
&
taneously until the display shows
Relay test.
With a/b in the display, select
&
Basic load.
4. Check the CO content. Should the
2
actual value deviate by more than
1 % from the above range, imple-
ment steps from page 15 (possibly
replace the burner).
5. Enter actual values into the service
report.
6. Set the upper rated output.
Constant temperature control unit:
With a/b in the display, select
&
2.
Weather-compensated control unit:
With a/b in the display, select
&
Full load.