Checking The Gas Train Valves For Tightness - Viessmann MatriX-Disk burner Service Instructions For Contractors

Commissioning, inspection, maintenance
Closing the combustion chamber
Tighten the burner door screws diagonally to a torque
of 30 Nm.
Danger
Leaks in the burner door can result in poisoning
through escaping flue gas.
Check the burner door for flue gas tightness,
e.g. with inspection mirror, dew point indicator,
gas sensor or thermal image camera.
In the event of leaks: Tighten the burner door
screws diagonally to a torque of 40 Nm.
Check the flue gas tightness again.

Checking the gas train valves for tightness

A
Fig. 20
1. Close the gas shut-off valve.
2. Undo screw in test connector
the screw.
3. Connect the test pump (pressure tester) at test
connector .
B
26
B
. Do not remove
B
(cont.)
4. Using the test pump, carefully build a test pressure
of approx. 50 mbar (5 kPa).
5. Wait approx. 5 min for the temperature to level out.
Then observe the display on the pressure tester:
The gas train is gas-tight if the displayed pressure
does not drop by more than 1 mbar (0.1 kPa)
within a further 5 min.
Otherwise, replace the gas train.