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

Further details regarding the individual steps
Checking both gas train valves automatically for gas-tight-
ness
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 AE" is shown in the burner control
unit display; if the second valve is not
tight, fault code "F AF" is displayed.

Checking all gas connections for tightness

Danger
Escaping gas leads to a risk of
explosion.
Always carry out the following
steps.
1. Insert new gaskets in all gas fittings
that have been opened and tighten
those fittings afterwards.
2. Open the gas shut-off valve.
Commissioning, inspection, maintenance
(cont.)
In either case, the gas train must be
replaced.
Danger
Escaping gas leads to a risk of
explosion.
Check the test connector for

gas-tightness.

3. Check the inlet seals of the gas
train for 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.
4. Start the burner (see page 8).
5. Check the outlet seals of the gas
train, the fittings between the fan
and the burner flange, and between
the fan and the venturi pipe for
tightness.
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