Checking Both Gas Train Valves Automatically For Tightness; Checking All Gas Connections For Tightness - Viessmann VITOCROSSAL 200 Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
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Checking both gas train valves automatically for tightness

The burner control unit automatically
checks the valves for tightness when the
burner is started. If the valves are gas-
tight, the burner enters standard mode
and the burner starts.
If the first valve is not tight, fault code
"F E1" is shown on the burner control unit
display; if the second valve is not tight,
fault code "F E2" is displayed.

Checking all gas connections for tightness

Danger
Escaping gas leads to a risk of
explosion.
Always carry out the following
steps.
42
3A/3B
41
145
15A/15B
1. Plug burner cable fA and KM BUS
cable aVG into the burner control
unit.
2. Plug control unit connecting cable
fÖ/aBH, boiler sensor leads §A/
§B, flue gas sensor lead aGA/aGB
and power cable fÖ on the burner
side into the connectors on the
mounting plate.
3. Plug control unit connecting cable
fÖ/aBH and KM BUS cable aVG into
the control unit.
In either case, the gas train must be
replaced.
Danger
Escaping gas leads to a risk of
explosion.
Check test connector for gas
tightness.
!
Please note
The use of leak detection spray
can result in incorrect functions.
Leak detection spray must not
come into contact with electrical
contacts.
(cont.)