Checking Both Gas Train Valves For Tightness (For - Viessmann VITOCROSSAL 200 Service Instructions Manual

Further details regarding the individual steps
Checking both gas train valves for tightness (for 115 to 311 kW)
1. Close the gas shut-off valve.
2. Undo the screw in test nipple B, but
do not remove.
3. Undo the screw in test nipple A, but
do not remove.
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 tighten
those fittings afterwards.
2. Open the gas shut-off valve.
Commissioning, inspection, maintenance
4. Connect the pressure tester with the
manual pump at test nipple A.
5. Gently activate the manual pump to
build a test pressure of approx.
50 mbar.
6. Wait approx. 5 min for the tempera-
ture to level out and then observe the
display on the pressure tester:
The gas train is tight if the displayed
pressure does not drop by more than
1 mbar within 5 min.
Otherwise it leaks. In that case, return
the gas train to your local Viessmann
sales office for tests.
7. After the test, close both test nipples
by tightening the respective screws.
Danger
Escaping gas leads to a risk of
explosion.
Check the test nipple for gas
tightness.
3. Check the inlet seals of the gas train
for tightness.
4. Start the burner (see page 7).
5. Check the outlet seals of the gas train
and fittings between the fan and the
boiler door and between the fan and
the Venturi pipe for tightness.
(cont.)
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