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Manual_S5_Airplus_2015_04_20 Page 41 / 68
© Wodtke GmbH - Tübingen. All Rights and Changes Reserved.Printed 04/2015 Part No. 950 976
16 Maintenance (WA Display)
The functionality of your unit depends decisively
on proper and regular maintenance. Maintenance
frequency, in turn, depends decisively on your pel-
let quality and regular cleaning by the operator.
Soot is an excellent insulator, which means that
units which are not maintained can emit continu-
ally less heat to the outside or to the heat ex-
changer and efficiency drops as a result. Follow-
ing maintenance, energy is optimally utilised again
and you will save on heating costs, as well as pro-
tect the environment.
Maintenance of the unit must be performed no
later than after consuming 1.5 t of pellets (or
earlier, depending on pellet quality), or when
the WA indicator appears.
Maintenance may also be necessary at an earlier
time, particularly if the ash content of the pellets
exceeds a value of 0.5% or the burner pot is not
regularly cleaned.
Attention / Danger:
Units which are not maintained according to
our specifications may not be operated. All
warranty claims are void in case of non-com-
pliance
Our tips:
Have the ash content of your pellets
confirmed in writing by the supplier, it
is the essential characteristic for
maintenance frequency. Quality pellets
generally have only about 0.2 to 0.3%
ash content!
Regularly clean the burner pot.
We recommend having maintenance
performed by a qualified installer. Enter
into a maintenance contract with your
qualified installer.
Example of the influence of pellet quality on
maintenance frequency:
The maintenance interval of 1,500 kg of pellet
through-put is based on quality pellets with 0.25%
ash content. If the ash content is 0.5% (that is,
twice as high), the maintenance interval reduces
to 750 kg, because twice as much ash and soot
occurs. If the ash content were to even equal 1%
(that is, 4x higher than normal), the through-put
between maintenance would likewise reduce by a
factor of four, or to about 375 kg. This is not taken
into consideration in the unit's display, because
this assumes the use of standard pellets.
Our company defines standard pellets in the for-
mulas stored in the control electronics for calcula-
tion of the maintenance indicator as follows:
Standard pellets have a diameter of 6 mm, a uni-
form length of 1 cm, a bulk weight of 650 kg/m³
and an ash content of 0.25%. Because these val-
ues can differ in practice from pellet type to pellet
type and batch, the volume of pellets actually put
through can differ from the displayed value. Note:
due to the internal data processing in the unit
(rounding of operating cycles), a maximum numer-
ical error deviation of all meter readings of 10% is
possible.
41


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