Checking Both Gas Train Valves For Tightness; Checking All Gas Connections For Tightness; Checking The Flue Gas Routing; Performing Final Checks - Viessmann MatriX Service Instructions For Contractors

Checking both gas train valves for tightness

A
Fig. 18
1. Close the gas shut-off valve.
2. Undo the screw inside test connector
pressure, but do not remove.
3. Undo the screw in test connector
remove.
4. Connect the pressure tester with manual pump at
test connector .
A
Checking the filter element in the gas line (if installed) and replacing if
required

Checking all gas connections for tightness

Danger
Escaping gas leads to a risk of explosion.
Always carry out the following steps.
1. Insert new gaskets in all gas fittings that have been
opened and then tighten the fittings.
2. Open the gas shut-off valve.
3. Check the inlet seals of the gas train for tightness.

Checking the flue gas routing

Performing final checks

1. Carry out final checks in accordance with the steps
on pages 12 to 14.
B
for intake
B
, but do not
A
Commissioning, inspection, maintenance
5. Steadily operate the manual pump to build a test
pressure of approx. 50 mbar (5 kPa).
6. Wait approx. 5 min for the temperature to level out
and 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
5 min.
Otherwise there is a leak. In this case, return the
gas train to your local Viessmann sales office for
tests.
7. After testing, close both test connectors by tighten-
ing the respective screws.
Danger
Escaping gas leads to a risk of explosion.
Check the test connectors for gas tightness.
!
Please note
The use of leak detection spray can result in
faulty operation.
Leak detection spray must not come into
contact with electrical contacts.
4. Start the burner (see page 7).
5. Check the outlet seals of the gas train for tightness.
!
Please note
The use of leak detection spray can result in
faulty operation.
Leak detection spray must not come into
contact with electrical contacts.
2. Record the actual values in the report (on
page 39).
17