Checking The Nozzle Pressure - Viessmann Vitopend 100-W Installation And Service Instructions For Contractors

Commissioning, inspection, maintenance
Further details regarding the individual steps
Supply pressure (flow pressure)
for natural gas H
i: for natural
gas H, M
Below 17 mbar
Below 1.7 kPa
17 to 25 mbar
1.7 to 2.5 kPa
Above 25 mbar
Above 2.5 kPa

Checking the nozzle pressure

Note
Never modify the factory settings when
operating with natural gas E+.
Only check the nozzle pressure at the
lower and upper rated heating output
(with cap B on).
The values given in the following tables
are control values for adjusting the max.
heating output (see page 25).
22
for LPG P
Below 25 mbar
Below 2.5 kPa
25 to 45 mbar
2.5 to 4.5 kPa
Above 45 mbar
Above 4.5 kPa
Actions
Do not commission the boiler. Notify your
gas supply utility or LPG supplier.
Start the boiler.
Position a separate gas pressure gover-
nor upstream of the system and regulate
the pre-charge pressure to 20 mbar/
2 kPa for natural gas or 37 mbar/
3.7 kPa for LPG. Notify your gas supply
utility or LPG supplier.
(cont.)