Checking The Gas Train Filter Element; Checking The Filter Element In The Gas Line; Checking The Gas Connections For Tightness - Viessmann Vitocrossal CRU 800 Service Instructions For Contractors

Commissioning, inspection, maintenance
Checking the gas train valves for tightness
6. After completing the test, close the screw on test
connector B . Check the test connector for leaks.
Danger
Escaping gas leads to a risk of explosion.
Check the test connector 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.
Note
Only use suitable and approved leak detection
agents (EN 14291) and devices for the tightness
test. Leak detection agents with unsuitable constit-
uents (e.g. nitrides, sulphides) can cause material
damage.
Remove residues of the leak detection agent after
testing.

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 contami-
nation. Remove the filter and carefully clean with
compressed air or replace.
3. Reassemble the gas train in reverse order using
new gaskets.

Checking the filter element in the gas line

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

Checking the gas connections for tightness

Danger
Escaping gas leads to a risk of explosion.
Check all gas equipment for tightness.
26
(cont.)
4. Check for gas tightness.
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.
Note
Only use suitable and approved leak detection
agents (EN 14291) and devices for the tightness
test. Leak detection agents with unsuitable constit-
uents (e.g. nitrides, sulphides) can cause material
damage.
Remove residues of the leak detection agent after
testing.
Manufacturer's instructions for filter element
1. Insert new gaskets in all gas fittings that have been
opened and retighten them.