Viessmann Vitodens 100 Installation And Service Instructions Manual page 44

Installation steps
Commissioning and testing
Setting the max. output
Note
The gas control is fully modulating and will normally facilitate a rapid heat up at
maximum output followed by a continually controlled heat output. If the system
has a particularly low heating load it is possible to restrict the maximum heating
output to prevent short cycling.
You can limit the output via the modulation range.
44
(cont.)
8. Check the inlet working pressure
= 20 mbar.
&
Minimum working pressure = 12
mbar
&
Maximum working pressure = 20
mbar
Note
Use suitable test equipment, with
a resolution of at least 0.5 mbar,
to measure the supply pressure.
9. Shut down the boiler, close the
gas shut-off valve, remove the
pressure gauge, and close test
nipple C with the screw.
10. Open the gas shut-off valve and
start the boiler.
Danger
Gas escaping from the test
nipple leads to a risk of
explosion.
Check test nipple C for
soundness.
1. Switch OFF the mains power.
2. Unhook the front of the control unit
and flip down.