Viessmann MatriX Service Instructions Manual page 13

Further details regarding the individual steps
1. Release the screw in the test
nipple A, but do not remove.
2. Connect the U−pipe pressure
gauge to the test nipple A
(vacuum).
3. Open the gas shut−off valve.
4. Check the position of the rotary
damper when the burner is in idle
mode.
The rotary selector damper
window C must be fully open
and the graduated collar E on the
air choke motor at the mark D
must be set to "0".
5. Check that the compensation
cable B is connected between the
gas combination valve and the
distributor pipe.
6. Start the burner (see page 5).
7. Check the position of the rotary
damper during the start−up phase.
The rotary selector damper
window C must close for approx.
4 s; during this period, the
graduated collar E is set to "30".
8. Approx. 60 s after burner start,
press "S" (H) and " " (G).
Note
Display F shows
H Status: "d" (= control stop)
Initial start−up, inspection and maintenance
H Service: Modulation level in %
("00." = 100 % higher output
"00" = 0 % lower output)
9. Press "+" (K), until the display
shows "00.".
Burner runs at its higher output.
10. Check the venturi suction
pressure.
Burner
output
in kW
248
314
During the adjustment, also
check the gas throughput by
means of a volumetric test.
11. Record the test value in the
service report (on page 49).
12. Press "S" (H) and " " (G). The
burner is now in operating mode.
13. Close the gas shut−off valve.
14. Remove the U−pipe 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.)
Permissible venturi
suction pressure
in mbar
Natural Natural
gas E gas LL
14.0 ± 0.5 12.5 ± 0.5
13.0 ± 0.5 10.0 ± 0.5
13