Viessmann MatriX Service Instructions Manual page 11

Further details regarding the individual steps
1. Release the screw in the test
nipple A, but do not remove.
2. Connect the pressure gauge to the
test nipple A (vacuum).
3. Open the gas shut−off valve.
4. Start the burner (see page 5).
5. Approx. 60 s after burner start,
press "S" (D) and " " (C)
simultaneously.
Note
Display B shows
H Status: "d" (= control stop) and
H Service: Modulation level in %
("00." = 100 % = higher output,
"00" = 0 % = lower output)
6. Press "+" (E), until the display
shows "00.".
Burner runs at its higher output.
Initial start−up, inspection and maintenance
7. Check the venturi suction
pressure.
Set negative pressure at the
higher output:
H 7 ± 0.5 mbar for natural gas E,
H 6 ± 0.5 mbar for natural gas LL.
During the adjustment, also
check the gas throughput by
means of a volumetric test.
8. Record the test value in the
service report (on page 49).
9. Press "S" (D) and " " (C).
The burner is now in operating
mode.
10. Close the gas shut−off valve.
11. Release the pressure gauge,
close the test nipple A.
¨
Danger
Escaping gas leads to a risk of
explosions.
Check the test nipple and
fittings for soundness.
(cont.)
11