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

Commissioning, inspection, maintenance

Checking the gas train valves for tightness

Checking both gas train valves for tightness (for 115 to 311 kW)
Fig. 29
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 filter element in the gas line

If a filter element is fitted in the gas line, check the filter
element and replace if necessary.

Checking gas connections for tightness

Danger
Escaping gas leads to a risk of explosion.
Always carry out the following steps:
!
Please note
The use of leak detection spray can result in
faulty operation.
Leak detection spray must not come into contact
with electrical contacts.
1. Insert new gaskets in all gas fittings that have been
opened and retighten them.
26
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
2. Open the gas shut-off valve.
3. Check the inlet joints of the gas train for tightness.
4. Start the burner (see page 9).
5. Check for tightness:
■
■
■
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.
Outlet joints of the gas train
Joint between the fan and the boiler door
Joint between the fan and the Venturi pipe