Chemical Processes And Technology - Miele PLW 8617 Operating Instructions Manual

Chemical processes and technology

In this section you will find a description of the causes of common issues which can occur
between different types of soiling, process chemicals and the components of the machine,
along with their solutions as necessary.
This section is intended as a guide. If unforeseen interactions occur during reprocessing,
or if you have any questions on this subject, please contact Miele.
General information
Problem
If elastomers (seals and hoses) and plastic
components in the machine are damaged,
this can lead to, for example, swelling,
shrinking, hardening or brittleness of mate-
rials, causing tears and cracks to develop.
Components cannot function correctly and
this generally leads to leaks.
A heavy build-up of foam during the pro-
gram sequence will impair the cleaning and
rinsing effect on the wash items. Foam es-
caping from the wash cabinet can cause
damage to the machine.
When foam develops, the cleaning process
is not standardized or validated in principle.
Corrosion to stainless steel in the wash
cabinet and to accessories can give them a
different appearance:
- rust (red marks/discoloration)
- black marks/discoloration
- white marks/discoloration (etched sur-
face)
Corrosive pitting can lead to the machine
not being water-tight. Depending on the ap-
plication, corrosion can affect cleaning and
rinsing results (laboratory analysis) or cause
corrosion to stainless steel wash items.
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Solution
- Determine and remedy the cause of the
damage.
See information regarding "Associated
process chemicals", "Soiling", and "Reac-
tion between process chemicals and soil-
ing" in this section.
- Determine and remedy the cause of the
foam build-up.
- Check the process used regularly to mon-
itor foaming levels.
See information regarding "Associated
process chemicals", "Soiling", and "Reac-
tion between process chemicals and soil-
ing" in this section.
- Determine and remedy the cause of cor-
rosion.
See information regarding "Associated
process chemicals", "Soiling", and "Reac-
tion between process chemicals and soil-
ing" in this section.