Checking Gas Combination Valves (2) For Soundness - Viessmann Vitoflame 100 Service Instructions Manual

Initial start−up, inspection and maintenance
Further details regarding the individual steps

Checking gas combination valves (2) for soundness

22
(cont.)
Note
Only implement a function test on
combination valves with soundness
tester.
1. Close the gas shut−off valve.
2. Release the screw in test
connector A, but do not remove.
3. Release the screw in test
connector B, but do not remove.
4. Connect the U−shaped pressure
gauge with manual pump to test
connector B.
5. Gently activate the manual pump
to build 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:
The gas combination valve is
sound, if the displayed pressure
does not drop within a further
5 minutes by more than
1 mbar ³ continue with point 7.
Otherwise, the system leaks in
that case, return the gas
combination valve to Viessmann
Werke for tests.
7. After the test, close both test
connectors by tightening the
respective screws.
¨
Danger
Check the test connectors for
gas soundness.