22
Initial start-up, inspection and maintenance
Further details regarding the individual steps (cont.)
Checking both valves of the gas train for leaks
Please note:
Only a function test is required for
gas trains with leak test device.
1. Close the gas shut-off valve.
2. Release the screw in test nippleĂA
but do not remove.
3. Release the screw in test nippleĂB
but do not remove.
4. Connect the U-shaped pressure
gauge with a manual pump to test
nippleĂB.
5. By gently activating the manual
pump, create a test pressure of
approx. 50 mbar.
6. Wait approximately five minutes
for the temperature to level out
and then observe the display on
the U-shaped pressure gauge:
If the displayed pressure does not
fall within a further five minutes
by more than 1 mbar, the gas train
is not leakingĂ continue with
item 7).
Otherwise, there is a leakĂćĂin this
case, return the gas train to
Viessmann Werke for tests.
7. After the test, close both test
adaptors by inserting screws.
¨ĂSafety instruction
Check the test nipple for gas leaks.
5692Ă534ĂGB
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