Miele S 247i User Manual download pdf (Page 24)

Technical Information

S 2xx, S 3xx & S 4xx Canister Vacuums

4.2.3 S 4xx

Figure 4-2: S 4xx Dustbag Change Indicator

Depending on the dust quantity and type, and the hose attachment in use, the

indicator shows when the dustbag should be changed.

If flour or fine mineral dust is vacuumed, the indicator may show that the

dustbag should be changed even if it is not full.

As the bag is filled, its permeability is reduced and the negative pressure level

in the bag is reduced. At the same time the negative pressure in the dust

compartment rises.

This increased negative pressure evacuates the dustbag change indicator

through its opening (Figure 4-2, Item 3) and removes air from the concertina

hose (Figure 4-2, Item 2). This then collapses and the visible indicator (Figure

4-2, Item 1) advances along its scale.

4.3 Suction Power

Figure 4-3: Suction Power Curve

The suction power is the product of the negative pressure developed and the

air throughput achieved divided by 10. The fan motor extracts air from the

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Miele S 247i User Manual Page 24