Checking The Gas Train Valves For Tightness; Checking The Gas Train Filter Element - Viessmann Vitocrossal 200 Service Instructions For Contractors

Checking the gas train valves for tightness

Checking both gas train valves for tightness (for 115 to 311 kW)
Fig. 27
1. Close the gas shut-off valve.
2. Undo the screw in test connector
remove.
3. Undo the screw in test connector
remove.
4. Connect the pressure tester with manual pump at
test connector .
A

Checking the gas train filter element

1. Unscrew intake flange from the gas train.
2. Check screen at gas train intake for soiling. If nec-
essary, remove screen and clean carefully with
compressed air.
3. Reassemble the gas train in reverse order.
5. Using the manual pump, carefully build a test pres-
sure of approx. 50 mbar (5 kPa).
6. Wait approx. 5 min for the temperature to level out
and then observe the display on the pressure
tester:
The gas train is gas-tight if the displayed pressure
does not drop by more than 1 mbar (0.1 kPa)
within 5 min.
Otherwise there is a leak. In this case, return the
gas train to your local Viessmann sales office for
tests.
7. After testing, close both test connectors by tighten-
ing the respective screws.
!
, but do not
B
A , but do not
4. Check for gas tightness.
!
Commissioning, inspection, maintenance
Danger
Escaping gas leads to a risk of explosion.
Check the test connectors for gas tightness.
Please note
The use of leak detection spray can result in
faulty operation.
Leak detection spray must not come into
contact with electrical contacts.
Danger
Escaping gas leads to a risk of explosion.
Check the gas train for gas tightness.
Please note
The use of leak detection spray can result in
faulty operation.
Leak detection spray must not come into
contact with electrical contacts.
29