Setting The Maximum Output - Viessmann FB2B Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
Supply (flow) pres- Supply (flow)
sure for natural pressure for LPG
gas
below 15 mbar below 25 mbar
15 to 25 mbar 25 to 45 mbar
above 25 mbar above 45 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 output is limited upwards by the boiler coding
card.
1. Press OK and å simultaneously
for approx. 4 s.
2. "Service functions"
3. "Max. output"
36
(cont.)
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 37 mbar for LPG. Notify your
gas supply utility or LPG supplier.
4. "Change?" Select "Yes".
A value flashes on the display (e.g.
"85"). In the delivered condition, this
value represents 100 % of rated out-
put.
5. Set the required value.