Function; Installation; Installing Flexfilter; Connections - Nederman Flexfilter Manual De Instrucciones

EN FlexFilter
3.2

Function

The function of the dust collector is simple. The inlet module, level 5 in Figure 1, separates
coarse particles, which pass a cone on level 6, and fall down into the collecting module
on level 7. Fine dust particles follow the up-going air flow through the housing on level 3
where the filter unit is installed, level 2.
The particles are separated on the outside surface of the filter socks. A long spiral spring in
each filter sock keeps it from flattening as air, with a certain pressure drop, passes through
the sock from outside to inside. Clean air leaves the dust collector through the top module,
level 1.
The pressure drop increases as more fine dust settles on the filter socks. During filter
cleaning, part of the dust is dislodged and falls down into the collecting module. It is not
desirable to dislodge all the dust. A certain quantity of fine particles on the filter socks gives
much better separation than completely clean socks.
Different kinds of dust have widely different properties. Some kinds are easily cleaned off the
filter socks while others require more powerful cleaning. FlexFilter with standard filter cleaning
uses its own vacuum to generate a short blast of air backwards through the filter socks. A
compressed air cylinder in the top module, controlled by AFC-B, opens a disc valve so that
atmospheric air can rush into the dust collector to neutralise the vacuum stored inside the dust
collector. The higher the vacuum and the larger the connected piping system, the more air will
flush backwards through the filter socks.
FlexFilter RF (Reverse Flow) has an arrangement of valves and uses the capacity of the
vacuum unit to clean half the dust collector while the other half is in normal operation.
RF is suitable for "hard to clean dust", or if the vacuum level is insufficient to generate a
powerful blast of air with standard filter cleaning. The modular design makes it possible to
change the top module from standard filter cleaning to RF cleaning, if desired.
4

Installation

4.1

Installing FlexFilter

The dust collector can be placed indoors or outdoors. The foundation should be level and
hard. If sited outdoors, weatherproofing under a roof is recommended. In case of high
humidity (of the air being cleaned) the dust collector should not be exposed to freezing
temperatures.
The distance from the vacuum unit should be less than 25 m.
Dust collectors with standard legs are delivered firmly screwed onto a transport pallet. For
lowest transport height, and a low centre of gravity, the dust collectors are shipped upside
down. The dust collecting bin is delivered on a separate pallet. See Figures 3–4.
Loosen 4 screws (on each side), see Figure 5. Turn the dust collector as per Figure 6. In the
horizontal position a catch will lock, Figure 7, which must be released by pressing before
lifting into an upright position. Lift slowly and ensure the catch locks in the upright position.
Secure with the 8 screws as per Figure 8. Figure 9 shows the dust collector ready for
removal from the transport pallet. Bolt the dust collector onto to its foundation.
The distance from the wall behind the dust collector should be at least 800 mm (31.5")
to enable tilting when replacing the filter package, see Figure 10. If the dust collector can
not be tilted there must be at least 1 m of free area above the dust collector to enable
convenient replacement of filters.
4.2

Connections

Figure 11 shows normal connections. The compressed air must be dry and clean. It can
be supplied from the compressed air filter serving the vacuum unit. The figure indicates
suitable pressure. Consumption of compressed air is very small. Compressed air cylinders
14