Checking Both Valves Of The Gas Combination Valve For Soundness - Viessmann MatriX Service Instructions Manual

Further details regarding the individual steps

Checking both valves of the gas combination valve for soundness

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