Viessmann Vitopend 100-W Installation And Service Instructions Manual page 22

Commissioning, inspection, maintenance
Further details regarding the individual steps
05. Select the upper heating output:
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3
2
1
Turn rotary selector "tw" clockwise
as far as it will go (leave at that posi-
tion briefly), then turn it back.
"Serv" appears.
Note
The operation with the upper rated
heating output is automatically reset
after approx. 30 min or by switching
the power OFF and ON again.
06. Remove cap B from the gas train.
07. Test the nozzle pressure at the
upper rated heating output. In case
of deviations from the value shown
in the following table, adjust screw
C (SW 10) for the upper rated heat-
ing output.
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5
6
08. Selecting the lower heating out-
put:
Note
Adjust the upper rated heating out-
put before selecting the lower rated
heating output. The 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 the 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 case
of deviations from the value shown
in the following table, adjust the noz-
zle pressure for the lower rated
heating output using cross-head
screw D. Counterhold screw C
(SW 10).
10. Fit cap B.
11. Check the setting values and record
them in the "Reports" table.
12. Switch OFF the system at the con-
trol unit (the boiler shuts down),
close the gas shut-off valve, remove
the pressure gauge and close test
nipple A with the screw.
(cont.)
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