eta HACK 20 kW, Service Manual

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5000 h / 3 years Cleaning and maintenance
Check the setting for the [RotValveStop] function
If the discharge screw and the stoker screw are in
operation simultaneously, use the [Service] authorisa-
tion in the boiler text menu to check the setting for the
[RotValveStop] function. The factory setting is [Yes].
The function can be seen under:
It can be deliberately set to [No] if the used fuel
requires it.
If the discharge screw and the stoker screw are in
operation simultaneously and the function is set to
[Yes], either the sensor is faulty or the gap between the
screw in the gear and the sensor is too large and must
be adjusted. The gap should be about 1 - 2 mm.
2.6.12 Calibrate lambda probe
Calibrating the lambda probe
The boiler's built-in lambda probe checks the
residual oxygen content of the flue gas and uses
it to control the combustion. To ensure reliability, the
control system autonomously performs an automatic
calibration after every 500 hours of operation.
If you wish to perform an additional lambda probe cal-
ibration, the control system features the [Addl. calibra-
tion] function. This function can be selected with the
[Service] access level and can be found under:
Switch on this function and the additional calibration
will now start. If the boiler is heating, it is automatically
stopped first. De-ashing begins, then the boiler is
purged with fresh air. After this, the residual oxygen
content is measured and the lambda probe is automat-
ically calibrated. Altogether, these steps last approxi-
mately 1.5 to 2 hours. When the calibration is
complete, the boiler goes back into operation and
starts heating, if necessary.
After another 100 hours of operation, the control
system automatically performs another calibra-
tion.
Conveying system
Stoker unit
RotValveStop
Inputs
Residual O2
Addl. calibration