Checking Both Gas Train Valves For Tightness; Checking All Gas Connections For Tightness; Implementing Final Checks - Viessmann MatriX Service Instructions For Contractors

Commissioning, inspection, maintenance

Checking both gas train valves for tightness

B
A
Fig. 16
1. Close the gas shut-off valve.
2. Undo screw inside test connector
pressure, but do not fully remove it.
3. Loosen the screw in test connector
remove.
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 those fittings.
2. Open the gas shut-off valve.
3. Check the inlet joints of the gas train for tightness.
4. Start the burner (see page 7).

Implementing final checks

1. Carry out final checks in accordance with the
points on pages 11 to 13.
16
4. Connect the pressure tester with the manual pump
at test connector
5. Gently 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 a further 5 min.
Otherwise there is a leak. In this case, return the
gas train to your local Viessmann sales office for
tests.
7. After the test, close both test connectors by tight-
ening the respective screws.
!
B for intake
, but do not
A
5. Check the outlet seals for tightness:
■
■
■
!
2. Record actual values in the report (on page 38).
A .
Danger
Escaping gas leads to a risk of explosion.
Check test connector for gas tightness.
Please note
The use of leak detection spray can result in
incorrect functions.
Leak detection spray must not come into
contact with electrical contacts.
Gas train
Joint between the fan and the boiler door
Joint between the fan and the Venturi pipe
Please note
The use of leak detection spray can result in
faulty operation.
Leak detection spray must not come into
contact with electrical contacts.