Viessmann Vitoligno 300-H Installation And Service Instructions For Contractors page 129

Lambda probe
(cont.)
Notes
■ Do not paint, wax or treat the probe with any other
such substance. Only use special grease recommen-
ded for Lambda probes to grease the threads.
■ The Lambda probe receives its reference air via the
connecting cable. For this reason, ensure that the
connection plugs are kept clean and dry and do not
treat with contact spray, anti-corrosion agents, etc.
■ Do not solder the connecting cable; it must be crim-
ped, clamped or secured with screws.
Checking and calibrating the Lambda probe
The Lambda probe can be calibrated manually as fol-
lows:
Danger
There is a risk of fire and burns due to hot com-
ponents and cinders.
■ Switch OFF the boiler and let it cool down.
■ Carry out maintenance and cleaning work only
on central heating boilers that have cooled
down.
■ Allow hot component to cool down before
removing.
■ Wear suitable personal protective equipment,
in particular protective gloves.
Requirements
Boiler not in operation
■
■ Flue gas temperature < 50 °C
Check Lambda probe
1. Disconnect the Lambda probe plug. Remove the
Lambda probe from the flue pipe.
2. Check the Lambda probe for contamination and
damage. Clean if necessary.
3. Reconnect the Lambda probe plug.
4. Call up the service menu on the control unit.
Probe heating is activated automatically.
Connection
The Lambda probe is connected at slot
chapter "Connection and wiring diagram" from
page 142.
5. Hang the Lambda probe for at least 15 minutes
outside the boiler in the installation room without
any earth contact.
Calibrating the Lambda probe
1.
d
2. /
| ~
3.
d
4. /
| ~
5.
d
6. /
| ~
7.
d
8. /
| ~
9.
d
10.
ä
Note
The Lambda probe is calibrated correctly when
21 % O
. See
a:K
+ simultaneously for approx. 4 seconds.
å
The "Service" menu appears.
for "Service functions".
to confirm.
for "Calibrate O2 probe".
to confirm.
to select.
to confirm.
for "Yes".
to confirm.
until the default display is shown.
is displayed.
2
Maintenance
129