Checking The Gas Train Valves For Tightness; Checking The Gas Train Filter Element - Viessmann VITOCROSSAL CRU 800 kW Service Instructions Manual

Commissioning, inspection, maintenance

Checking the gas train valves for tightness

A
Fig. 20
1. Close the gas shut-off valve.
2. Undo the screw in test connector
remove.
3. Connect the pressure gauge at test connector
4. Using the pressure gauge, carefully build a test
pressure of approx. 50 mbar (5 kPa).
5. 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 a further 5 min.
Otherwise, replace the gas train.

Checking the gas train filter element

1. Close the gas shut-off valve. Unscrew intake
flange from the gas train.
2. Check the filter at the gas train intake for soiling.
Remove the filter, carefully clean with compressed
air or replace.
28
B
, but do not
B
B
6. After completing the test, close the screw on test
connector . Check the test connector for leaks.
B
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.
3. Reassemble the gas train in reverse order.