Viessmann VITOCONTROL-S, WB2B, Service Instructions Manual, Page: 17 / 124

17
9. Danger
Gas escaping from the test
nipple leads to a risk of explo-
sions.
Check for tightness.
Open the gas shut-off valve, start the
boiler and check for tightness at test
nipple
A .
Supply (flow) pres-
sure for natural
gas Supply (flow)
pressure for LPG Measures
below 15 mbar below 42.5 mbar Do not start the boiler. Notify your mains
gas or LPG supplier.
15 to 25 mbar 42.5 to 57.5 mbar Start the boiler.
above 25 mbar above 57.5 mbar Install a separate gas pressure governor
upstream of the system and regulate the
pre-charge pressure to 20 mbar for natu-
ral gas or 50 mbar for LPG. Notify your
mains gas or LPG supplier.
Setting the maximum output
Note
You can limit the maximum output for heating operation. The limit is set via the
modulation range. The max. adjustable heating output is limited upwards by the boiler
coding card.
1. Start the boiler.
2.
Press
K
and
F
simultaneously
until a value flashes (e.g. "85") and
"
A
" appears. In the delivered condi-
tion, this value represents 100 % of
rated output.
On weather-compensated control
units, the display additionally shows
"Max. output" .
3.
With
a
/
b
select the required value
in % of rated output as maximum out-
put.
4. Confirm the set value with
d
.
5. Record the settings for maximum out-
put on the additional type plate inclu-
ded with the "technical documenta-
tion". Affix the type plate next to the
original type plate on top of the
boiler.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5692 760 GB