Setting The Maximum Output - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
5. Start the boiler.
Note
During commissioning, the boiler can
enter a fault state because of airlocks
in the gas line. After approx. 5 s,
press the reset button R (see operat-
ing instructions) to reset the burner.
6. Check the supply (flow) pressure.
Set value:
■ Natural gas: 20 mbar
■ LPG: 50 mbar
Note
Use suitable test equipment with a
resolution of at least 0.1 mbar to
measure the supply pressure.
Supply (flow) pres- Supply (flow)
sure for natural pressure for LPG
gas
below 17.4 mbar below 42.5 mbar
17.4 to 25 mbar 42.5 to 57.5 mbar
above 25 mbar above 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.
Weather-compensated control unit:
1. Press OK and å simultaneously
for approx. 4 s.
32
(cont.)
7. Record the actual value in the service
report on page 157.
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.
9. Open the gas shut-off valve and start
the boiler.
Danger
Gas escaping from the test
nipple leads to a risk of explo-
sions.
Check test nipple A for tight-
ness.
Measures
Do not start the boiler. Notify your gas
supply utility or LPG supplier.
Start the boiler.
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
gas supply utility or LPG supplier.
2. "Service functions"
3. "Max. output"