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Cleaning the machine
FOM 71 MP-Lab
Cleaning the machine from debris in water, lint, scale and residual
detergent
It is very important that the wet parts of the machine are free from debris
and particles that may affect influence the wash performance of the machi-
ne.
Lint and threads from ballast and test swatches may accumulate on the
heating elements and as the bundle of lint/threads will grow it may even-
tually become so large that it clogs the drain valve, causing the drain valve
to leak. This leakage will definitely affect wash performance as undissolved
detergent builds up above the drain valve seat when the main wash begins.
When leakage occurs, the concentrated solution will leak out reducing de-
tergent concentration in the bath.
Calcium carbonate from hard water used in IEC tests will, after prolonged
exposure, accumulate on the heating elements. If the scale layer is too thick
the heating elements may be destroyed due to the insulating effect of the
layer. The heating power will also be reduced giving longer heating times.
Lint from textiles, together with zeolite from detergent, will accumulate on
the surface of the outer drum and on the back gable. Detergent will also
build up in these layers. If the amount of detergent is exessive, this may af-
fect the wash and/or rinse results obtained from the reference machine.
It is not advisable simply to remove the heating elements to visually inspect
for scale or lint. The elements should only be removed where accumulations
of lint or scale have been identified using the inspection procedure descri-
bed below. Frequently removing the elements will sooner or later produce
high resistance in the wire connection, causing an excessively high connec-
tor temperature.