Vitoligno 300-C Installation/Service
5790 980 - 04
104
Service
Lambda Probe
For measuring the residual oxygen content in the flue gas.
Checking the Lambda probe
1. Check the Lambda probe for contamination and
damage; clean if necessary (see page 64).
2. Check the connecting cable for damage.
Notes:
Do not paint, wax or treat the probe with
any other such substance. Only use special
grease recommended 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 them with
contact spray, anti-corrosion agents, etc.
Do not solder the connecting cable; it must
be crimped, clamped or secured with screws.
Calibrating the Lambda probe
1. Hang the probe for at least 15 minutes outside the
boiler in the installation room without any ground
contact.
2. Call up the service menu on the control unit.
3. Use
|
/
~
to select menu point “Service function”.
Confirm
with
d
.
4. Use
|
/
~
to select menu point “Calibrate O2
probe”. Confirm with
d
.
The waiting time of 3 minutes is displayed in sec.
Connection
The Lambda probe is connected with plug
a:K
.
See page 132.
Lambda probe specification
Replacing the Ignition Element
CAUTION
Contact wires on the ignition element are easily damaged
if bent. When connecting the ignition element and the plug:
Use the contact openings provided.
Insert carefully.
Insert as far as possible.
CAUTION
The ignition element is damaged by overheating.
Always ensure that the combustion chamber door and
the covers on the boiler body are closed during start-up
and heating operation. If the combustion chamber door
or any covers are open, the ignition element does not
receive the required air supply.
Curve
Current in mA
Oxygen content O
2
in the flue gases in %
at exhaust temperatures 392°F (200°C)
Legend
A
Ignition element
