Checking The Nozzle Pressure - Viessmann VITOGAS 100-F Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Checking the nozzle pressure

A
B D C
1. Close the gas shut-off valve.
2. Release the screw inside test nipple
A, but do not remove, then connect
the pressure gauge.
3. Open the gas shut-off valve.
Start the boiler.
4. Check the nozzle pressure.
In case of deviation from the value
in the following table remove pro-
tective cap B.
Adjust the nozzle pressure with
screw C.
Note
Screw D has no function.
10
(cont.)
5. Check the setting values and record
them in the report.
6. Reposition protective cap B.
7. Switch OFF the system ON/OFF
switch on the control unit (the boiler
shuts down).
8. Close the gas shut-off valve.
9. Remove the pressure gauge and seal
test nipple A with screw C.
10. Open the gas shut-off valve, start
the boiler and check test nipple A
for gas tightness.
Danger
Gas escaping from the test
nipple leads to a risk of
explosion.
Check the test nipple for gas
tightness.