Viessmann Vitopend 100-W Installation And Service Instructions For Contractors page 24

Commissioning, inspection, maintenance
Further details regarding the individual steps
08. Select the lower heating output:
Note
Set the upper rated heating output
before setting the lower rated heat-
ing output. Operation with the lower
rated heating output is automatically
cancelled after approx. 30 min or by
switching the power off and on
again.
3
2
1
Turn rotary selector "tw" anti-
clockwise as far as it will go.
"Serv" appears.
09. Test the nozzle pressure at the
lower rated heating output. In the
case of deviations from the value
shown in the following table, adjust
the nozzle pressure for the lower
rated heating output using cross-
head screw D. Counterhold
screw C (SW 10).
10.5 to 24 kW
Rated heating output
Nozzle pressure relative to
20 mbar (2 kPa) supply pres-
sure
Gas Nozzle ø
in mm
Natural gas H 1.25
24
4
5
6
kW 10.5
mbar
kPa 0.26 0.29 0.34 0.53 0.76 1.03
10. Fit cap B.
11. Check the setting values and record
them in the "Reports" table.
12. Turn off the ON/OFF switch on the
control unit (the boiler shuts down).
Close the gas shut-off valve,
remove the pressure gauge and
close test connector A with the
screw.
13. Turn rotary selectors "tw" and
"tr" back to their original posi-
tions.
14. Open the gas shut-off valve and
start the appliance.
Danger
Gas escaping from the test
connector leads to a risk of
explosion.
Check the test connector for
gas tightness.
11 12
2.6 2.9 3.4
(cont.)
15 18 21
5.3 7.6 10.3
24
13.5
1.35