Setting The Maximum Output - Viessmann Vitodens 333-F Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
7. Record the actual value in the ser-
vice report on page 129.
Take the action shown in the follow-
ing table.
8. Shut down the boiler, close the gas
shut-off valve, remove the pressure
gauge and close test nipple A
with the screw.
Supply (flow) Supply (flow)
pressure for nat- pressure for
ural gas LPG
below 17.4 mbar below 42.5 mbar
17.4 to 25 mbar 42.5 to 57.5 mbar
in excess of in excess of
25 mbar 57.5 mbar

Setting the maximum output

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.
18
(cont.)
9. Open the gas shut-off valve and
start up the boiler.
Danger
Gas escaping from the test
nipple leads to a risk of
explosions.
Check test connector A for
tightness.
Measures
Do not start the boiler. Notify your
mains gas or LPG supplier.
Start the boiler.
Install a separate gas pressure gover-
nor upstream of the system and regu-
late the inlet pressure to 20 mbar for
natural gas or 50 mbar for LPG. Notify
your mains gas or LPG supplier.