Checking Both Valves Of Gas Combination Valve For Leaks - Viessmann MatriX radiant burner Service Instructions Manual

Further details regarding the individual steps

Checking both valves of gas combination valve for leaks

B
1. Close the gas shut−off valve.
2. Release the screw in test
nipple B but do not remove.
3. Release the screw in test nipple A
but do not remove.
4. Connect the U−shaped pressure
gauge with a manual pump to test
nipple A.
5. Gently activate the manual pump
to create a test pressure of approx.
50 mbar.
6. Wait approx. 5 minutes for the
temperature to level out, and then
observe the display on the
U−shaped pressure gauge:
Initial start−up, inspection and maintenance
A
(cont.)
If the displayed pressure does not
fall within a further 5 min by more
than 1 mbar, the gas combination
valve is sound ³ continue with
step 7).
Otherwise, the system leaks. In
this case, return the gas
combination valve to Viessmann
Werke for tests.
7. After the test, close both test
nipples by closing their respective
screws.
¨ Safety instructions
Check the test nipple for gas leaks.
17