Checking The Nozzle Pressure - Viessmann MatriX Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Checking the nozzle pressure

Preparing the test
A
B
C
D
E
Testing the nozzle pressure at the upper output
1. Press "+" E until the service display
has incremented to "00" (=100 %).
10
(cont.)
1. Undo the screw inside test nipple
A, but do not remove.
2. Connect the pressure tester at test
nipple A.
3. Open the gas shut-off valve.
4. Start the burner (see page 6).
5. Press "S" D and "-" C simultane-
ously.
Display C will then show the follow-
ing:
■ Under status: "d" (= control stop)
■ Under service: Modulation level in
% ("00" = 100 % = upper output,
"00" = 0 % = lower output)
2. Check the nozzle pressure in accord-
ance with the Wobbe index and the
output in the nozzle pressure table on
page 11.